1 This document details the changes between this version, bash-2.05a-release,
2 and the previous version, bash-2.05a-rc1.
6 a. Fixed the `printf' builtin so that the variable name supplied as an
7 argument to a %n conversion must be a valid shell identifier.
9 b. Improved the random number generator slightly.
11 c. Changes to configuration to not put -I/usr/include into $CFLAGS, since
12 it messes up some includes.
14 d. Corrected description of POSIXLY_CORRECT in man page and info manual.
16 e. Fixed a couple of cases of incorrect function prototypes that sneaked
17 through and caused compilation problems.
19 f. A few changes to avoid potential core dumps in the programmable completion
22 g. Fixed a configure problem that could cause a non-existent file to show
25 h. Fixed a configure problem that could cause siglist.o to not be built when
28 i. Changes to the strtoimax and strtoumax replacement functions to work
29 around buggy compilers.
31 j. Fixed a problem with the snprintf replacement function that could
32 potentially cause a core dump.
34 2. Changes to Readline
36 a. Fixed a locale-specific problem in the vi-mode `goto mark' command.
38 b. Fixed Makefile to not put -I/usr/include into CFLAGS, since it can cause
39 include file problems.
41 ------------------------------------------------------------------------------
42 This document details the changes between this version, bash-2.05a-rc1,
43 and the previous version, bash-2.05a-beta1.
47 a. Fixed the snprintf replacement to correctly implement the `alternate form'
48 of the %g and %G conversions.
50 b. Fixed snprintf to correctly handle the optional precision with the %g and
53 c. Fixed the arithmetic evaluation code to correct the values of `@' and `_'
54 when translating base-64 constants (they were backwards).
56 d. New library functions for formatting long and long long ints.
58 e. Fixed a few places where negative array subscripts could have occurred,
59 mostly as the result of systems using signed characters.
61 f. Fixed a few places that assumed a pid_t was no wider than an int.
63 g. Fixed the `maildir' mail checking code to work on systems where a
64 `struct stat' doesn't include an `st_blocks' member.
66 h. Fixed snprintf to make `unsigned long long' conversion formats (%llu)
69 i. Fixed snprintf to not print a sign when asked to do an unsigned conversion.
71 j. Made configure changes to avoid compiling empty source files in lib/sh.
73 k. New replacement functions (if necessary) for strtoull, strtoll, strtoimax,
76 l. The `printf' builtin now handles the `ll' and `j' length modifiers
77 directly, since they can affect the type and width of the argument
80 m. Renamed a number of the bash-specific autoconf macros in aclocal.m4 to
81 have more sytematic naming, with accompanying changes to configure.in.
83 n. Fixed snprintf to handle long doubles and the %a/%A conversions by
84 falling back to sprintf, as long as sprintf supports them.
86 o. Fixed return value from vsnprintf/snprintf to be the number of characters
87 that would have been printed, even if that number exceeds the buffer
88 size passed as an argument.
90 p. Bash no longer attempts to define its own versions of some ctype macros
91 if they are implemented as functions in libc but not as macros in
94 q. Changed the variable printing code (used by `set', `export', etc.) to
95 not use the $'...' syntax when in posix mode, since that caused
96 interoperability problems with other shells (most notably with autoconf).
97 When not in posix mode, it uses $'...' if the string to be printed
98 contains non-printing characters and regular single quotes otherwise.
100 r. snprintf now recognizes the %F conversion.
102 s. Fixed a bug that could cause the wrong status to be returned by a shell
103 function when the shell is compiled without job control and a null
104 command containing a command substutition was executed in the function.
106 t. When in posix mode, the default value for MAILCHECK is 600.
108 u. Bash only initializes FUNCNAME, GROUPS, and DIRSTACK as special variables
109 if they're not in the initial environment.
111 v. If SECONDS appears in the initial environment with a valid integer value,
112 bash uses that as the starting value, as if an assignment had been
115 w. Bash no longer auto-exports HOME, PATH, SHELL, or TERM, even though it
116 gives them default values if they don't appear in the initial environment.
118 x. Bash no longer auto-exports HOSTNAME, HOSTTYPE, MACHTYPE, or OSTYPE,
119 even if it assigns them default values.
121 y. Bash no longer removes the export attribute from SSH_CLIENT or SSH2_CLIENT
122 if they appear in the initial environment.
124 z. Bash no longer attempts to discover if it's being run by sshd in order to
125 run the startup files. If the SSH_SOURCE_BASHRC is uncommented in
126 config-top.h it will attempt to do so as previously, but that's commented
127 out in the distributed version.
129 aa. Fixed a typo in the code that tests for LC_NUMERIC.
131 bb. The POSIXLY_CORRECT shell variable and its effects are now documented.
133 cc. Some changes to several of the support shell scripts included in the
134 definitions to try to avoid race conditions and attacks.
136 dd. Several changes to avoid warnings from `gcc -Wall'.
138 ee. Fixed a problem with the `unset' builtin that could cause incorrect
139 results if asked to unset a variable and an array subscript in the
142 ff. A few changes to the shell's temporary file creation code to avoid
143 potential file descriptor leaks and to prefer the system's idea of
144 the temporary directory to use.
146 gg. Fixes to build with the C alloca in lib/malloc/alloca.c if the system
147 requires it but the shell has been configured --without-bash-malloc.
149 hh. Updated the documentation to note that only interactive shells resend
150 SIGHUP to all jobs before exiting.
152 ii. Fixes to only pass unquoted tilde words to tilde_expand, rather than
153 rely on tilde_expand or getpwnam(3) to handle the quotes (MacOS 10.x
154 will remove backslashes in any login name passed to getpwnam(3)).
156 jj. Small change from Paul Eggert to make LINENO right in commands run with
159 2. New Features in Bash
161 a. The `printf' builtin now handles the %a and %A conversions if they're
162 implemented by printf(3).
164 b. The `printf' builtin now handles the %F conversion (just about like %f).
166 c. The `printf' builtin now handles the %n conversion like printf(3). The
167 corresponding argument is the name of a shell variable to which the
170 3. Changes to Readline
172 a. Fixed a few places where negative array subscripts could have occurred.
174 b. Fixed the vi-mode code to use a better method to determine the bounds of
175 the array used to hold the marks.
177 c. Fixed the defines in chardefs.h to work better when chars are signed.
179 d. Fixed configure.in to use the new names for bash autoconf macros.
181 e. Readline no longer attempts to define its own versions of some ctype
182 macros if they are implemented as functions in libc but not as macros in
185 f. Fixed a problem where rl_backward could possibly set point to before
186 the beginning of the line.
188 ------------------------------------------------------------------------------
189 This document details the changes between this version, bash-2.05a-beta1,
190 and the previous version, bash-2.05a-alpha1.
194 a. Fixed a bug in the evalution of arithmetic `for' statements when the
195 expanded expression is NULL.
197 b. Fixed an unassigned variable problem in the redirection printing code.
199 c. Added more prototypes to extern function declarations in the header
200 files and to static function declarations in C source files.
202 d. Make sure called functions have a prototype in scope, to get the arguments
203 and return values right instead of casting. Removed extern function
204 declarations from C source files that were already included in header
207 e. Changed some function arguments to use function typedefs in general.h so
208 the prototypes can be checked. The only use of Function and VFunction
209 now is for unwind-protects.
211 f. More const changes to function arguments and appropriate variables.
213 g. Changed the mail checking support to handle `maildir'-style mail
216 h. Augmented the bash malloc to pass in the file and line number information
217 for each malloc, realloc, and free. This should result in better error
220 i. The `old' gnu malloc is no longer a configuration option.
222 j. Augmented the bash malloc with optional tracing and registering allocated
225 k. Prompt string decoding now saves and restores the value of $? when it
226 expands the prompt string, so command substitutions don't change $?.
228 i. Array indices are now `long', since shell arithmetic is performed as long,
229 and the internal arrayind_t type is used consistently.
231 j. Some more `unsigned char *' fixes from Paul Eggert.
233 k. Fixed a bad call to builtin_error that could cause core dumps when making
236 l. `return' may no longer be used to terminate a `select' command, for
237 compatibility with ksh.
239 m. Changed code that reads octal numbers to do a better job of detecting
242 n. The time formatting code no longer uses absolute indices into a buffer,
243 because the buffer size changes depending on the size of a `time_t'.
245 o. `umask' now prints four digits when printing in octal mode, for
246 compatibility with other shells.
248 p. Lots of changes to the `printf' builtin from Paul Eggert: it handles `L'
249 formats and long doubles better, and internal functions have been
250 simpified where appropriate.
252 q. Some `time_t' fixes for machines were a time_t is bigger than a long.
254 r. Replaced some bash-specific autoconf macros with standard equivalents.
256 s. Improvmed the code that constructs temporary filenames to make the
257 generated names a bit more random.
259 t. Added code that checks for ascii before calling any of the is* ctype
262 u. Changed some places where a `char' was used as an array subscript to use
263 `unsigned char', since a `char' can be negative if it's signed by default.
265 v. Lots of changes to the `ulimit' builtin from Paul Eggert to add support
266 for the new POSIX-200x RLIM_SAVED_CUR and RLIM_SAVED_MAX values and
269 w. `ulimit' now prints the description of a resource in any error message
270 relating to fetching or setting that resource's limits.
272 x. The `snprintf' replacement now computes maximum values at compile
273 time rather than using huge constants for things like long long.
275 y. Interactive shells now ignore `set -n'.
277 z. Changed the malloc bookkeeping information so that it's now 8 bytes
278 instead of 12 on most 32-bit machines (saving 4 bytes per allocation),
279 restoring 8-byte alignment.
281 aa. The malloc error reporting code now attempts to print the file and line
282 number of the call that caused the error.
284 bb. Changed the redirection error reporting code to catch EBADF errors and
285 report the file descriptor number rather than the file being redirected
286 to or from (e.g., things like `exec 4242<x' where 4242 is an out-of-range
289 cc. `printf', `echo -e', and the $'...' code now process only two hex digits
290 after a `\x' escape sequence for compatibility with other shells, and
291 the documentation was changed to note that the octal and hex escape
292 sequences result in an eight-bit value rather than strict ASCII.
294 2. Changes to Readline
296 a. The completion code now attempts to do a better job of preserving the
297 case of the word the user typed if ignoring case in completions.
299 b. Readline defaults to not echoing the input and lets the terminal
300 initialization code enable echoing if there is a controlling terminal.
302 c. The key binding code now processes only two hex digits after a `\x'
303 escape sequence, and the documentation was changed to note that the
304 octal and hex escape sequences result in an eight-bit value rather
307 3. New Features in Bash
309 a. The builtin `ulimit' now takes two new non-numeric arguments: `hard',
310 meaning the current hard limit, and `soft', meaning the current soft
311 limit, in addition to `unlimited'
313 b. `ulimit' now prints the option letter associated with a particular
314 resource when printing more than one limit.
316 c. `ulimit' prints `hard' or `soft' when a value is not `unlimited' but is
317 one of RLIM_SAVED_MAX or RLIM_SAVED_CUR, respectively.
319 4. New Features in Readline
321 a. New bindable variable `history-preserve-point'. If set, the history
322 code attempts to place the user at the same location on each history
323 line retrived with previous-history or next-history.
325 ------------------------------------------------------------------------------
326 This document details the changes between this version, bash-2.05a-alpha1,
327 and the previous version, bash-2.05-release.
331 a. Better checks in the redirection code for write errors.
333 b. bashbug now uses $TMPDIR, defaulting to /tmp, and uses mktemp(1) more
336 c. System-specific configuration changes for: Interix, OpenBSD, FreeBSD,
339 d. Some more `const' cleanups through the code.
341 e. Fixed a typo in the /dev/fd redirection code, better checks for valid
342 numeric fds in /dev/fd.
344 f. Fixed many parts of the shell to handle integer overflow more gracefully
345 and to do more stringent checks for valid numbers.
347 g. Fixed mksignames to include config.h.
349 h. Fixed an uninitialized variable problem that could cause the shell to core
350 dump when replacing characters in a string.
352 i. New mechanism for updating the patch level when official patches are
353 released (patchlevel.h).
355 j. configure.in changed to no longer require external files _distribution and
358 k. Fixed non-interactive shell initialization problem when bash started as
361 l. Fixed printf builtin conversion error handling to be POSIX.2-conformant.
363 m. autoconf-2.52 is now used to build configure; autoconf-2.50 or newer is
364 required. Some of the bash-specific macros were removed, since they are
367 n. Startup files and files read with source or `.' are no longer required to
370 o. Fixed core dump in builtin printf when user-supplied precision or field
373 p. Fixed builtin printf to treat a negative field width as a positive field
374 width with left-justification.
376 r. New unwind-protect implementation from Paul Eggert.
378 s. Fixed an inadvertently-unclosed comment in the bash completion code that
379 caused programmable completions to not add trailing slashes or spaces to
382 t. Fixed the process substitution code to cope better when stdin is closed.
384 v. Fixes, mostly from Paul Eggert, for a few possible buffer overflows in
387 w. Fixes from Paul Eggert to avoid most of the type casts in the shell code,
388 and use more appropriate types for a number of variables.
390 x. Command substition no longer inherits the DEBUG trap.
392 y. Some fixes to the process substition code on machines without /dev/fd so
393 that named pipes are not removed inappropriately.
395 z. The loadable `getconf' builtin is now much more complete, and will become
396 part of the shell in the future.
398 aa. The select command no longer terminates on a `return', so it can be used
399 to return from an enclosing function (as ksh does it).
401 bb. Fixed the extended pattern matching code to behave better when presented
402 with incorrectly-formed patterns.
404 cc. Some changes were made with the intent of making cross-compilation easier.
406 dd. The network code (/dev/tcp and /dev/udp redirections) uses getaddrinfo(3)
407 if it's available, which adds support for IPv6.
409 ee. Subshells of login shells no longer source ~/.bash_logout when they exit.
411 ff. Fixes so that subshells don't exit inappropriately if the -e option has
414 gg. Restricted shells no longer allow functions to be exported.
416 hh. Changes to the pattern matching code so extended pattern matching works
417 on systems with deficient shared library implementations, like MacOS X.
419 ii. Better error messages when a script with a leading `#!interp' fails
420 to execute because of problems with `interp'.
422 jj. Fixed `compgen' to handle the `-o default' option better.
424 kk. Fixed the job control code to force an asynchronous process's standard
425 input to /dev/null only if job control is not active.
427 ll. Fixed a possible infinite recursion problem when `fc ""=abc' (a null
428 pattern) is used to re-execute a previous command.
430 mm. Fixed `declare [-a] var=value' to assign VALUE to element 0 if VAR is an
431 array variable. Similarly for `declare [-a] var[N]=value'. This is like
434 nn. Fixed a bug that caused `read -a aname' to work even if ANAME had been
437 oo. Fixed a possible integer overflow problem when constructing names for
440 2. New Features in Bash
442 a. Added support for DESTDIR installation root prefix, so you can do a
443 `make install DESTDIR=bash-root' and do easier binary packaging.
445 b. Added support for builtin printf "'" flag character as per latest POSIX
448 c. Support for POSIX.2 printf(1) length specifiers `j', `t', and `z' (from
451 d. New autoconf macro, RL_LIB_READLINE_VERSION, for use by other applications
452 (bash doesn't use very much of what it returns).
454 e. `set [-+]o nolog' is recognized as required by the latest POSIX drafts,
457 f. New read-only `shopt' option: login_shell. Set to non-zero value if the
458 shell is a login shell.
460 g. New `\A' prompt string escape sequence; expands to time in 24 HH:MM format.
462 h. New `-A group/-g' option to complete and compgen; does group name
465 i. New `-t' option to `hash' to list hash values for each filename argument.
467 j. New [-+]O invocation option to set and unset `shopt' options at startup.
469 k. configure's `--with-installed-readline' option now takes an optional
470 `=PATH' suffix to set the root of the tree where readline is installed
473 l. The ksh-like `ERR' trap has been added. The `ERR' trap will be run
474 whenever the shell would have exited if the -e option were enabled.
475 It is not inherited by shell functions.
477 m. `readonly', `export', and `declare' now print variables which have been
478 given attributes but not set by assigning a value as just a command and
479 a variable name (like `export foo') when listing, as the latest POSIX
482 n. `bashbug' now requires that the subject be changed from the default.
484 o. configure has a new `--enable-largefile' option, like other GNU utilities.
486 p. `for' loops now allow empty word lists after `in', like the latest POSIX
489 3. Changes to Readline
491 a. More `const' and type casting fixes.
493 b. Changed rl_message() to use vsnprintf(3) (if available) to fix buffer
496 c. The completion code no longer appends a `/' or ` ' to a match when
497 completing a symbolic link that resolves to a directory name, unless
498 the match does not add anything to the word being completed. This
499 means that a tab will complete the word up to the full name, but not
500 add anything, and a subsequent tab will add a slash.
502 d. Fixed a trivial typo that made the vi-mode `dT' command not work.
504 e. Fixed the tty code so that ^S and ^Q can be inserted with rl_quoted_insert.
506 f. Fixed the tty code so that ^V works more than once.
508 g. Changed the use of __P((...)) for function prototypes to PARAMS((...))
509 because the use of __P in typedefs conflicted g++ and glibc.
511 4. New Features in Readline
513 a. Added extern declaration for rl_get_termcap to readline.h, making it a
514 public function (it was always there, just not in readline.h).
516 b. New #defines in readline.h: RL_READLINE_VERSION, currently 0x0402,
517 RL_VERSION_MAJOR, currently 4, and RL_VERSION_MINOR, currently 2.
519 c. New readline variable: rl_readline_version, mirrors RL_READLINE_VERSION.
521 d. New bindable boolean readline variable: match-hidden-files. Controls
522 completion of files beginning with a `.' (on Unix). Enabled by default.
524 e. The history expansion code now allows any character to terminate a
525 `:first-' modifier, like csh.
527 f. The incremental search code remembers the last search string and uses
528 it if ^R^R is typed without a search string.
530 ------------------------------------------------------------------------------
531 This document details the changes between this version, bash-2.05-release,
532 and the previous version, bash-2.05-beta2.
536 a. Make sure we note that the first line of a multi-line command was not
537 saved in the history if the tests for HISTCONTROL succeed, but the
538 HISTIGNORE check fails.
540 b. Fixed a bug in the pattern matching code that caused `[' to be treated
541 as a special character inside a `[...]' bracket expression.
543 c. Fixed a bug in the pattern matching code that caused `]' to terminate
544 a bracket expression even if it was the first character after the `['
545 (or a leading `!' or `^').
547 d. Made a small change to report a more user-friendly error message if
548 execve(2) fails because of an error with the interpreter in a script
549 with a leading `#! interpreter'.
551 e. If the OS does not support an exec(2) magic number of `#!', make sure we
552 have a non-null interpreter name before attempting to execute it.
554 f. Fixed a bug that caused the shell process to end up in a different
555 process group than the controlling terminal if a job-control shell was
556 run with `exec' in the startup files.
558 g. When started in POSIX mode, either by `bash --posix', `bash -o posix', or
559 `sh', $SHELLOPTS includes `posix' and POSIXLY_CORRECT is set.
561 h. Fixed a problem that caused the `\W' prompt string escape sequence to
562 expand to nothing when $PWD was `//'.
564 i. The `bashbug' shell script no longer uses $(...) command substitution.
566 j. When `set' is invoked without options in POSIX mode, it no longer prints
567 the names and definitions of shell functions.
569 2. Changes to Readline
571 a. rl_set_paren_blink_timeout() is now documented.
573 b. Corrected history.3 man page: `$' is not in the default value of
574 history_word_delimiters.
576 c. If a hook function assigned to rl_event_hook sets rl_done to a non-zero
577 value, rl_read_key() now immediately returns '\n' (which is assumed to
578 be bound to accept-line).
580 3. New Features in Bash
582 a. The `>&word' redirection now works in POSIX mode as it does by default,
583 since POSIX.2 leaves it unspecified.
585 ------------------------------------------------------------------------------
586 This document details the changes between this version, bash-2.05-beta2,
587 and the previous version, bash-2.05-beta1.
591 a. Fixed a bug in the arithmetic evaluation code so that a^=b is supported.
593 b. Fixed startup so posixly_correct is retained across subshells begun to
594 execute scripts without a leading `#!'.
596 c. Fixed a bug that caused $(< file) to not work in a (...) subshell.
598 d. Added config support for Linux running on the IBM S390.
600 e. Fixed a bug that caused bash to get its input pointer out of sync when
601 reading commands through a pipe and running a command with standard
602 input redirected from a file.
604 f. Made a change so that command completion now makes about half as many
605 stat(2) calls when searching the $PATH.
607 g. Fixed a bug that caused variable assignments preceding `return' to not
608 be propagated to the shell environment in POSIX mode.
610 h. Fixed a bug with ${parameter[:]?word} -- tilde expansion was not performed
613 i. In POSIX mode, `break' and `continue' do not complain and return success
614 if called when the shell is not executing a loop.
616 j. Fixed `bash -o posix' to work the same as `bash --posix'.
618 k. Fixed a bug where variable assignments preceding `eval' or `source/.'
619 would not show up in the environment exported to subshells run by the
622 l. In POSIX mode, shells started to execute command substitutions inherit
623 the value of the `-e' option from their parent shell.
625 m. In POSIX mode, aliases are expanded even in non-interactive shells.
627 n. Changed some of the job control messages to display the text required by
628 POSIX.2 when the shell is in POSIX mode.
630 o. Fixed a bug in `test' that caused it to occasionally return incorrect
631 results when non-numeric arguments were supplied to `-t'.
633 2. Changes to Readline
635 a. Some changes were made to avoid gcc warnings with -Wall.
637 b. rl_get_keymap_by_name now finds keymaps case-insensitively, so
638 `set keymap EMACS' works.
640 c. The history file writing and truncation functions now return a useful
643 d. Fixed a bug that could cause applications to dereference a NULL pointer
644 if a NULL second argument was passed to history_expand().
646 3. New Features in Bash
648 a. doc/readline.3 has been moved to the readline distribution.
650 4. New Features in Readline
652 a. New function, rl_get_screen_size (int *rows, int *columns), returns
653 readline's idea of the screen dimensions.
655 b. The timeout in rl_gather_tyi (readline keyboard input polling function)
656 is now settable via a function (rl_set_keyboard_input_timeout()).
658 c. Renamed the max_input_history variable to history_max_entries; the old
659 variable is maintained for backwards compatibility.
661 d. The list of characters that separate words for the history tokenizer is
662 now settable with a variable: history_word_delimiters. The default
665 ------------------------------------------------------------------------------
666 This document details the changes between this version, bash-2.05-beta1,
667 and the previous version, bash-2.05-alpha1.
671 a. Changes to allow shared library and object building on the GNU Hurd.
673 b. Fixes to the way exported functions are placed into the environment and
676 c. The globbing library once again respects locales when processing ranges
677 in bracket expressions while doing pattern matching.
679 d. System-specific configuration changes for: Tru 64, Interix
681 e. Bashbug now uses /usr/bin/editor as one of the editing alternatives, and
682 will use mktemp(1) or tempfile(1), if present, for temporary file creation.
684 f. Bash no longer performs a binary file check on a script argument that's
685 really a tty (like /dev/fd/0 or /dev/stdin).
687 g. Fixed a bug in the execution of shell scripts that caused the effects of
688 $BASH_ENV to be undone in some cases.
690 h. Fixed several bugs that made `bash [-i] /dev/stdin' not work correctly.
692 i. Several changes to the job control code to avoid some signal state
695 j. The Bash malloc no longer blocks signals as often, which should make it
698 k. Fixed a parsing bug that did not allow backslash to escape a single quote
699 inside a $'...' construct.
701 l. Fixed a bug that caused things like ${var:=$'value'} to be parsed
702 incorrectly. This showed up in newer versions of autoconf.
704 m. Fixed a bug in the bash-specific readline initialization that caused
705 key bindings to bash-specific function names appearing in .inputrc to
708 n. Bash now sets the file descriptor it uses to save the file descriptor
709 opened on a shell script to close on exec.
711 o. Fixed a bug in the prompt string decoding that caused it to misbehave
712 when presented an octal sequence of fewer than three characters.
714 p. Fixed the `test' builtin to return an error if `[' is supplied a single
715 argument that is not `]'.
717 q. Fixed a bug that caused subshells started to run executable shell scripts
718 without a leading `#!' to incorrectly inherit an argument list preceding
719 a shell builtin (like such a script called from a script sourced with `.',
720 where there were variable assignments preceding the `.' command)
722 r. Fixed a bug that caused changes to variables supplied in an assignment
723 statement preceding a shell builtin to not be honored (like a script
726 s. HOSTTYPE, OSTYPE, and MACHTYPE are set only if they do not have values
727 when the shell is started.
729 t. Fixed a bug that caused SIGINT to kill shell scripts after the script
732 u. The `fc' builtin now tries to create its temporary files in the directory
735 v. Bash no longer calls any Readline functions or uses any Readline variables
736 not declared in readline.h.
738 w. Fixed a bug that caused some substitutions involving $@ to not be split
739 correctly, especially expansions of the form ${paramterOPword}.
741 x. SSH2_CLIENT is now treated like SSH_CLIENT and not auto-exported if it
742 appears in the initial environment.
744 y. Fixed a couple of problems with shell scripts without a leading `#!'
745 being executed out of shell functions that could cause core dumps if
746 such a script attempted to execute `return'.
748 z. Fixed a problem with the `-nt' and `-ot' binary operators for the
749 `test/[' builtin and the `[[' conditional command that caused wrong
750 return values if one of the file arguments did not exist.
752 aa. Fixed a bug that caused non-interactive shells which had previously
753 executed `shopt -s expand_aliases' to fail to expand aliases in a
754 command like `(command) &'.
756 2. Changes to Readline
758 a. Changes to make most (but not yet all -- there is still crlf()) of the
759 exported readline functions declared in readline.h have an rl_ prefix.
761 b. More `const' changes in function arguments, mostly for completion
764 c. Fixed a bug in rl_forward that could cause the point to be set to before
765 the beginning of the line in vi mode.
767 d. Fixed a bug in the callback read-char interface to make it work when a
768 readline function pushes some input onto the input stream with
769 rl_execute_next (like the incremental search functions).
771 e. Fixed a file descriptor leak in the history file manipulation code that
772 was tripped when attempting to truncate a non-regular file (like
775 f. Some existing variables are now documented and part of the public
776 interface (declared in readline.h): rl_explict_arg, rl_numeric_arg,
777 rl_editing_mode, rl_last_func.
779 g. Renamed rltty_set_default_bindings to rl_tty_set_default_bindings and
780 crlf to rl_crlf, so there are no public functions declared in readline.h
781 without an `rl_' prefix. The old functions still exist for backwards
784 3. New Features in Bash
786 a. A new loadable builtin, realpath, which canonicalizes and expands symlinks
787 in pathname arguments.
789 b. When `set' is called without options, it prints function defintions in a
790 way that allows them to be reused as input. This affects `declare' and
791 `declare -p' as well.
793 4. New Features in Readline
795 a. New application-callable function rl_set_prompt(const char *prompt):
796 expands its prompt string argument and sets rl_prompt to the result.
798 b. New application-callable function rl_set_screen_size(int rows, int cols):
799 public method for applications to set readline's idea of the screen
802 c. The history example program (examples/histexamp.c) is now built as one
805 ------------------------------------------------------------------------------
806 This document details the changes between this version, bash-2.05-alpha1,
807 and the previous version, bash-2.04-release.
811 a. A fix was made to allow newlines in compond array assignments.
813 b. configure now checks for real-time signals with unusable values.
815 c. Interactive shells no longer exit if a substitution fails because of an
816 unset variable within a sourced file.
818 d. Fixed a problem with incorrect matching of extended glob patterns when
819 doing pattern substitution.
821 e. `{' is now quoted by the completion code when it appears in a filename.
823 f. Fixed an error in pattern matching that caused the matcher to not
824 correctly skip the rest of a bracket expression after a character
827 g. Fixed a bug in the IFS word splitting code to make a non-whitespace IFS
828 character preceded by IFS whitespace part of the current delimiter rather
829 than generating a separate field.
831 h. The {!prefix@} expansion now generates separate words, analogous to $@,
834 i. Command substitution now ignores NUL bytes in the command output, and the
835 parser ignores them on input.
837 j. A fix was made to the job control code to prevent hanging processes when
838 the shell thinks background processes are running but the kernel returns
839 -1/ECHILD from waitpid().
841 k. `pwd' now prints an error message if the write fails when displaying the
844 l. When in POSIX mode, the shell prints trap dispostions without a leading
845 `SIG' in the signal specification.
847 m. Fixed a parser bug that caused the current command's line count to be
848 messed up by a compound array assignment.
850 n. Fixed a bug in the unwind-protect code that caused bad behavior on machines
851 where ints and pointers are not the same size.
853 o. System-specific configure changes for: MacOS X.
855 p. Changes for Cygwin to translate \r\n and \r to \n and to set file
856 descriptors used for reading input to text mode in various places.
858 q. Fixed a bug that caused `!' to occasionally not be honored when in
861 r. Bash no longer assumes that getcwd() will return any useful error message
862 in the buffer passed as an argument if the call fails.
864 s. The `source', `.', and `fc' builtins no longer check whether a file is
865 binary before reading commands from it.
867 t. Subshells no longer turn off job control when they exit, since that
868 sometimes resulted in the terminal being reset to the wrong process
871 u. The history code no longer tries to save the second and subsequent lines
872 of a multi-line command if the first line was not saved.
874 v. The history saving code now does a better job of saving blank lines in a
877 w. Removed a `feature' that made `ulimit' silently translate `unlimited' to
878 the current hard limit, which obscured some kernel error returns.
880 x. Fixed the grammar so that `}' is recognized as a reserved word after
881 another reserved word, rather than requiring a `;' or newline. This
882 means that constructs like
888 y. Conditional commands ([[...]]) now perform tilde expansion on their
891 z. Noted in the documentation that `set -a' will cause functions to be
892 exported if they are defined after `set -a' is executed.
894 aa. When an interactive login shell starts, if $PWD and $HOME refer to the
895 same directory but are not the same string, $PWD is set to $HOME.
897 bb. Fixed `printf' to handle invalid floating point numbers better.
899 cc. Temporary files are now created with random filenames, to improve security.
901 dd. The readline initialization code now binds the custom bash functions and
902 key bindings after the readline defaults are set up.
904 ee. Fixed the `source' builtin to no longer overwrite a shell function's
905 argument list, even if the sourced file changes the positional parameters.
907 ff. A bug fix was made in the expansion of `$*' in contexts where it should
908 not be split, like assignment statements.
910 gg. Fixed a bug in the parameter substring expansion to handle conditional
911 arithmetic expressions ( exp ? val1 : val2 ) without cutting the expression
912 off at the wrong `:'.
914 hh. The `<>' redirection is no longer subject to the current setting of
915 `noclobber', as POSIX.2 specifies.
917 ii. Fixed a bug in the conditional command parsing code that caused expressions
918 in parentheses to occasionally be parsed incorrectly.
920 jj. Fixed a bug in the ((...)) arithmetic command to allow do...done or
921 {...} to follow the )) without an intervening list terminator.
923 kk. `printf' now treats `\E' the same as `\e' when performing backslash escape
924 expansion for the `%b' format specifier.
926 ll. When in POSIX mode, the shell no longer searches the current directory for
927 a file to be sourced with `.' or `source' if `.' is not in $PATH.
929 mm. Interactive comments are no longer turned off when POSIX mode is disabled.
931 nn. The UID, EUID, HOSTNAME variables are not set if they are in the shell's
932 environment when it starts up.
934 oo. Fixed a bug in the `command' builtin so the effect of a command like
935 `command exec 4<file' is as if the `command' had been omitted.
937 pp. ${foo[@]} and ${foo[*]} now work as in ksh93 if `foo' is not an array
940 qq. ${#foo[X]}, where X is 0, @, or *, now work as in ksh93 if `foo' is not
943 rr. The shell's idea of an absolute pathname now takes into account a
944 possible drive specification on Cygwin and other Windows systems.
946 ss. Fixed a bug which caused incorrect parsing of some multi-character
947 constructs if they were split across input lines with backslash-newline
950 tt. Fixed a bug that caused restricted shell mode to be set inappropriately
951 when trying to execute a shell script without a leading `#!'.
953 uu. Shell function definitions no longer require that the body be a group
954 command ( {...} ), as POSIX.2 requires.
956 vv. The `cd' and `pwd' builtins now process symlinks in pathnames internally
957 and should require many fewer calls to getcwd().
959 ww. Fixed a bug that caused a pipeline's process group to be set incorrectly
960 if one of the pipeline elements contained a command substitution.
962 xx. Fixed a bug that caused core dumps when expanding the value of HISTIGNORE.
964 yy. The output of `set' is now quoted using $'...' so invisible characters are
965 displayed as escape sequences.
967 zz. Fixed the help text for `unset', since PATH and IFS may both be unset.
969 aaa. The shell no longer puts directory names into the command hash table.
971 bbb. Fixed a bug in `read' that caused it to occasionally free memory twice if
972 it was interrupted after reading a large amount of data.
974 ccc. Assignment statements that attempt to assign values to readonly variables
975 now cause the command to return an error status.
977 ddd. Fixed a bug that could cause incorrect output if a $(<file) construct was
980 eee. GROUPS and FUNCNAME now return an error status when assignment is
981 attempted, but may be unset (in which case they lose their special
982 properties). In all respects except unsetting, they are readonly.
984 fff. The string-to-integer conversion code now ignores trailing whitespace in
985 the string, even if strtol(3) does not.
987 ggg. The tcsh magic-space function now does a better job of inserting the
988 space close to where the point was before the history expansion, rather
989 than just appending it.
991 hhh. Fixed a bug which caused a file sourced from an interactive shell to
992 fill up the jobs table if it ran lots of jobs.
994 iii. Fixed a bug in the parameter pattern substitution code to avoid infinite
995 recursion on zero-length matches.
997 2. Changes to Readline
999 a. When setting the terminal attributes on systems using `struct termio',
1000 readline waits for output to drain before changing the attributes.
1002 b. A fix was made to the history word tokenization code to avoid attempts to
1003 dereference a null pointer.
1005 c. Readline now defaults rl_terminal_name to $TERM if the calling application
1006 has left it unset, and tries to initialize with the resultant value.
1008 d. Instead of calling (*rl_getc_function)() directly to get input in certain
1009 places, readline now calls rl_read_key() consistently.
1011 e. Fixed a bug in the completion code that allowed a backslash to quote a
1012 single quote inside a single-quoted string.
1014 f. rl_prompt is no longer assigned directly from the argument to readline(),
1015 but uses memory allocated by readline. This allows constant strings to
1016 be passed to readline without problems arising when the prompt processing
1017 code wants to modify the string.
1019 g. Fixed a bug that caused non-interactive history searches to return the
1020 wrong line when performing multiple searches backward for the same string.
1022 h. Many variables, function arguments, and function return values are now
1023 declared `const' where appropriate, to improve behavior when linking with
1026 i. The control character detection code now works better on systems where
1027 `char' is unsigned by default.
1029 j. The vi-mode numeric argument is now capped at 999999, just like emacs mode.
1031 k. The Function, CPFunction, CPPFunction, and VFunction typedefs have been
1032 replaced with a set of specific prototyped typedefs, though they are
1033 still in the readline header files for backwards compatibility.
1035 m. Nearly all of the (undocumented) internal global variables in the library
1036 now have an _rl_ prefix -- there were a number that did not, like
1037 screenheight, screenwidth, alphabetic, etc.
1039 n. The ding() convenience function has been renamed to rl_ding(), though the
1040 old function is still defined for backwards compatibility.
1042 o. The completion convenience functions filename_completion_function,
1043 username_completion_function, and completion_matches now have an rl_
1044 prefix, though the old names are still defined for backwards compatibility.
1046 p. The functions shared by readline and bash (linkage is satisfied from bash
1047 when compiling with bash, and internally otherwise) now have an sh_ prefix.
1049 q. Changed the shared library creation procedure on Linux and BSD/OS 4.x so
1050 that the `soname' contains only the major version number rather than the
1051 major and minor numbers.
1053 r. Fixed a redisplay bug that occurred when the prompt spanned more than one
1054 physical line and contained invisible characters.
1056 3. New Features in Bash
1058 a. Added a new `--init-file' invocation argument as a synonym for `--rcfile',
1059 per the new GNU coding standards.
1061 b. The /dev/tcp and /dev/udp redirections now accept service names as well as
1064 c. `complete' and `compgen' now take a `-o value' option, which controls some
1065 of the aspects of that compspec. Valid values are:
1067 default - perform bash default completion if programmable
1068 completion produces no matches
1069 dirnames - perform directory name completion if programmable
1070 completion produces no matches
1071 filenames - tell readline that the compspec produces filenames,
1072 so it can do things like append slashes to
1073 directory names and suppress trailing spaces
1075 4. New Features in Readline
1077 a. The blink timeout for paren matching is now settable by applications.
1079 b. _rl_executing_macro has been renamed to rl_executing_macro, which means
1080 it's now part of the public interface.
1082 c. Readline has a new variable, rl_readline_state, which is a bitmap that
1083 encapsulates the current state of the library; intended for use by
1084 callbacks and hook functions.
1086 ------------------------------------------------------------------------------
1087 This document details the changes between this version, bash-2.04-release,
1088 and the previous version, bash-2.04-beta5.
1092 a. Better compile-time and configure-time checks for the necessity of
1095 b. A bug was fixed in the expansion of "${@:-}" when there are positional
1098 c. A typo was fixed in the output of `complete'.
1100 d. The matches generated for a word by the `-W' argument to complete and
1101 compgen are now matched against the word being completed, and only
1102 matches are returned as the result.
1104 e. Some fixes were made for systems which do not restart read(2) when a
1105 signal caught by bash is received.
1107 f. A bug was fixed which caused the umask to be set to 0 when an invalid
1108 symbolic mode mask was parsed.
1110 g. Fixed a bug that could cause a core dump if a SIGCHLD was received while
1111 performing an assignment statement using command substitution.
1113 h. Changed the word splitting function for programmable completion so cases
1114 in which the cursor is between words are handled a bit better.
1116 2. Changes to Readline
1118 a. rl_funmap_names() is now documented.
1120 3. New Features in Bash
1122 a. The LC_NUMERIC variable is now treated specially, and used to set the
1123 LC_NUMERIC locale category for number formatting, e.g., when `printf'
1124 displays floating-point numbers.
1126 ------------------------------------------------------------------------------
1127 This document details the changes between this version, bash-2.04-beta5,
1128 and the previous version, bash-2.04-beta4.
1132 a. A couple of changes were made to the Makefiles for easier building on
1135 b. Fixed a bug where the current prompt would be set to $PS2 at startup.
1137 c. The shell script that tests an already-installed version was changed to
1138 remove the directory it created its test programs in at exit.
1140 d. Several changes were made to the code that tokenizes an input line for
1141 the programmable completion code. Shell metacharacters will now appear
1142 as individual words in the word list passed to the completion functions.
1143 Some of the example completion shell functions were changed to understand
1144 redirection operators.
1146 e. A bug was fixed that, under obscure circumstances, could confuse the
1147 parser when a shell function was run by the programmable completion code.
1149 f. A bug was fixed in the ulimit builtin for systems not using getrlimit().
1151 g. The execution code now propagates the correct exit status back to the rest
1152 of the code if the return value of a subshell command was being inverted.
1153 Some new test cases for inverting return values with the `!' reserved
1154 word have been added.
1156 h. Negative exponents in the arithmetic evaluation of v**e now return an
1159 i. A bug that caused bash to check the wrong process in a pipeline for
1160 abnormal termination (and consequently resetting the terminal attributes)
1163 j. Fixed a bug that caused $PS2 to be displayed after PROMPT_COMMAND was
1166 2. Changes to Readline
1168 1. Fixed a bug in a C preprocessor define that caused the keypad control
1169 functions to be compiled out for all platforms except DJGPP.
1171 ------------------------------------------------------------------------------
1172 This document details the changes between this version, bash-2.04-beta4,
1173 and the previous version, bash-2.04-beta3.
1177 a. A couple of changes were made to the redirection to attempt to avoid
1178 race conditions and malicious file replacement.
1180 2. A change was made to the string evaluation code (used for command
1181 substitution, `eval', and the `.' builtin) to fix an obscure core
1182 dump on alpha machines.
1184 3. A bug that caused $LINENO to be wrong when executing arithmetic for
1187 4. A couple of memory leaks in the programmable completion code were fixed.
1189 5. A bug that could cause a core dump by freeing memory twice during a call
1190 to `eval' if `set -u' had been enabled and an undefined variable was
1191 referenced was fixed.
1193 ------------------------------------------------------------------------------
1194 This document details the changes between this version, bash-2.04-beta3,
1195 and the previous version, bash-2.04-beta2.
1199 a. Bash should run the appropriate startup files when invoked by ssh2.
1201 b. Fixed a bug in the parsing of conditional commands that could cause a
1204 c. Fixed a bug in parsing job specifications that occasionally caused
1205 core dumps when an out-of-range job was referenced.
1207 d. Fixed the `type' and `command' builtins to do better reporting of
1208 commands that are not found in $PATH or the hash table.
1210 e. Fixed a POSIX.2 compliance problem in the command builtin -- commands
1211 are supposed to be reported as full pathnames.
1213 f. The `echo' builtin now returns failure if a write error occurs.
1215 g. Fixed a bug which caused the locale to not be reset correctly when
1218 h. Changed description of `getopts' in man page and reference manual to make
1219 it clear that option characters may be characters other than letters.
1221 i. If the shell exits while in a function, make sure that any trap on EXIT
1222 doesn't think the function is still executing.
1224 j. Bashbug now tries harder to find a usable editor if $EDITOR is not set,
1225 rather than simply defaulting to `emacs'.
1227 k. Changes to the scripts that guess and canonicalize the system type, from
1228 the latest `automake' distribution via Debian.
1230 l. When using named pipes for process substitution, make sure the file
1231 descriptors opened for reading are set to non-blocking mode.
1233 m. Fixed a bug that caused termination of pipelines that are killed by a
1234 signal to not be reported in some cases.
1236 n. When not in literal-history mode, shell comment lines are not added to
1239 o. When running in POSIX.2 mode, bash no longer performs word splitting on
1240 the expanded value of the word supplied as the filename argument to
1241 redirection operators.
1243 p. The prompt string decoding code now backslash-quotes only characters that
1244 are special within double quotes when expanding the \w and \W escape
1247 q. Fixed a bug in the prompt decoding code that could cause a non-interactive
1248 shell to seg fault if `\u' was used in PS4 and the shell was in xtrace
1251 r. Fixed a bug that caused function definitions to be printed with any
1252 redirections that should be attached to the entire function before the
1255 s. Changed the tilde expansion code for Cygwin systems to avoid creating
1256 pathnames beginning with `//' if $HOME == `/'.
1258 t. Fixed a couple of autoconf tests to avoid creating files with fixed names
1261 u. The `trap' and `kill' builtins now know the names of the POSIX.1b real-
1262 time signals on systems which support them.
1264 2. Changes to Readline
1266 a. Fixed a problem with the single-quote quoting function that could cause
1269 b. Fixed a bug that caused incorrect `stat characters' to be printed if
1270 the files being completed were in the root directory and visible-stats
1273 3. New Features in Bash
1275 a. There is a new `rbash.1' manual page, from the Debian release.
1277 b. The `--enable-usg-echo-default' option to `configure' has been renamed to
1278 `--enable-xpg-echo-default'. The old option is still there for backwards
1281 ------------------------------------------------------------------------------
1282 This document details the changes between this version, bash-2.04-beta2,
1283 and the previous version, bash-2.04-beta1.
1287 a. Fixed a bug that could cause pipes to be closed inappropriately in
1290 b. Fixed a bug that caused creation of the exported environment to clobber
1291 the current command string if there were any exported shell functions.
1293 c. Some changes were made to reduce bash's memory usage.
1295 d. Fixed a problem with programmable completion and filenames to be
1296 completed containing quote characters.
1298 e. Changed the code the removes named pipes created for the <(...) and >(...)
1299 expansions to defer removal until after any current shell function has
1302 f. Fixed a bug in `select' which caused it to not handle the `continue'
1305 g. Autoconf tests added for cygwin32 and mingw32.
1307 2. New Features in Bash
1309 a. The `--with-bash-malloc' configure option replaces `--with-gnu-malloc'
1310 (which is still there for backwards compatibility).
1312 ------------------------------------------------------------------------------
1313 This document details the changes between this version, bash-2.04-beta1,
1314 and the previous version, bash-2.04-alpha1.
1318 a. Fixed a bug in the programmable completion code that occurred when
1319 trying to complete command lines containing a `;' or `@'.
1321 b. The file descriptor from which the shell is reading a script is now
1322 moved to a file descriptor above the user-addressible range.
1324 c. Changes to `printf' so that it can handle integers beginning with 0
1325 or 0x as octal and hex, respectively.
1327 d. Fixes to the programmable completion code so it handles nonsense like
1328 `compgen -C xyz' gracefully.
1330 e. The shell no longer modifies the signal handler for SIGPROF, allowing
1331 profiling again on certain systems.
1333 f. The shell checks for a new window size, if the user has requested it,
1334 after a process exits due to a signal.
1336 g. Fixed a bug with variables with null values in a program's temporary
1337 environment and the bash getenv() replacement.
1339 h. `declare' and the other builtins that take variable assignments as
1340 arguments now honor `set -a' and mark modified variables for export.
1342 i. Some changes were made for --dump-po-strings mode when writing strings
1343 with embedded newlines.
1345 j. The code that caches export strings from the initial environment now
1346 duplicates the string rather than just pointing into the environment.
1348 k. The filename completion quoting code now uses single quotes by default
1349 if the filename being completed contains newlines, since \<newline>
1350 has a special meaning to the parser.
1352 l. Bash now uses typedefs bits32_t and u_bits32_t instead of int32_t and
1353 u_int32_t, respectively to avoid conflicts on certain Unix versions.
1355 m. Configuration changes were made for: Rhapsody, Mac OS, FreeBSD-3.x.
1357 n. Fixed a problem with hostname-to-ip-address translation in the
1358 /dev/(tcp|udp)/hostname/port redirection code.
1360 o. The texinfo manual has been reorganized slightly.
1362 p. Filename generation (globbing) range comparisons in bracket expressions
1363 no longer use strcoll(3) even if it is available, since it has unwanted
1364 effects in certain locales.
1366 q. Fixed a cosmetic problem in the source that caused the shell to not
1367 compile if DPAREN_ARITHMETIC was not defined but ARITH_FOR_COMMAND was.
1369 r. Fixed a bug in the here-document code tripped when the file descriptor
1370 opened to the file containing the text of the here document was the
1371 same as a redirector specified by the user.
1373 s. Fixed a bug where the INVERT_RETURN flag was not being set for `pipeline'
1374 in `time ! pipeline'.
1376 t. Fixed a bug with the `wait' builtin which manifested itself when an
1377 interrupt was received while the shell was waiting for asynchronous
1378 processes in a shell script.
1380 u. Fixed the DEBUG trap code so that it has the correct value of $?.
1382 v. Fixed a bug in the parameter pattern substitution code that could cause
1383 the shell to attempt to free unallocated memory if the pattern started
1384 with `/' and an expansion error occurs.
1386 w. Fixed a bug in the positional parameter substring code that could
1387 cause the shell to loop freeing freed memory.
1389 x. Fixed a bug in the positional parameter pattern substitution code so
1390 that it correctly handles null replacement strings with a pattern
1391 string prefixed with `%' or `#'.
1393 y. The shell no longer attempts to import functions from the environment if
1396 z. Fixed a bug that caused `return' in a command substitution executed in
1397 a shell function to return from the function in a subshell and continue
1400 aa. `hash -p /pathname/with/slashes name' is no longer allowed when the shell
1403 bb. The wait* job control functions now behave better if called when there
1404 are no unwaited-for children.
1406 cc. Command substitution no longer unconditionally disables job control in
1407 the subshell started to run the command.
1409 dd. A bug was fixed that occasionally caused traps to mess up the parser
1412 ee. `bashbug' now honors user headers in the mail message it sends.
1414 ff. A bug was fixed that caused the `:p' history modifier to not print the
1415 history expansion if the `histverify' option was set.
1417 2. Changes to Readline
1419 a. Fixed a bug in the redisplay code for lines with more than 256 line
1422 b. A bug was fixed which caused invisible character markers to not be
1423 stripped from the prompt string if the terminal was in no-echo mode.
1425 c. Readline no longer tries to get the variables it needs for redisplay
1426 from the termcap entry if the calling application has specified its
1427 own redisplay function. Readline treats the terminal as `dumb' in
1430 d. Fixes to the SIGWINCH code so that a multiple-line prompt with escape
1431 sequences is redrawn correctly.
1433 3. New Features in Bash
1435 a. `bashbug' now accepts `--help' and `--version' options.
1437 b. There is a new `xpg_echo' option to `shopt' that controls the behavior
1438 of echo with respect to backslash-escaped characters at runtime.
1440 ------------------------------------------------------------------------------
1441 This document details the changes between this version, bash-2.04-alpha1,
1442 and the previous version, bash-2.04-devel.
1446 a. Fixed a bug that could cause core dumps when performing substring
1449 b. Shared object configuration changes for: Solaris, OSF/1
1451 c. The POSIX_GLOB_LIBRARY code that uses the POSIX.2 globbing facilities
1452 for pathname expansion now understands GLOBIGNORE.
1454 d. The code that implements `eval' was changed to save the value of the
1455 current prompt, so an eval in a shell function called by the programmable
1456 completion code will not change the prompt to $PS2.
1458 e. Restored the undocumented NON_INTERACTIVE_LOGIN_SHELLS #define to
1459 config-top.h. If this is defined, all login shells will read the
1460 startup files, not just interactive and non-interactive started with
1461 the `--login' option.
1463 f. Fixed a bug that caused the expansion code to occasionally dump core if
1464 IFS contained characters > 128.
1466 g. Fixed a problem with the grammar so that a newline is not required
1467 after the `))' in the new-style arithmetic for statement; a semicolon
1468 may be used as expected.
1470 h. Variable indirection may now reference the shell's special variables.
1472 i. The $'...' and $"..." constructs are now added to the history correctly
1473 if they contain newlines and command-oriented history is enabled.
1475 j. It is now an error to try to assign a value to a function-local copy
1476 of a readonly shell variable (declared with the `local' builtin).
1478 2. Changes to Readline
1480 a. The history file code now uses O_BINARY mode when reading and writing
1481 the history file on cygwin32.
1483 3. New Features in Bash
1485 a. A new programmable completion facility, with two new builtin commands:
1486 complete and compgen.
1488 b. configure has a new option, `--enable-progcomp', to compile in the
1489 programmable completion features (enabled by default).
1491 c. `shopt' has a new option, `progcomp', to enable and disable programmable
1492 completion at runtime.
1494 d. Unsetting HOSTFILE now clears the list of hostnames used for completion.
1496 4. New Features in Readline
1498 a. A new variable, rl_gnu_readline_p, always 1. The intent is that an
1499 application can verify whether or not it is linked with the `real'
1500 readline library or some substitute.
1502 ------------------------------------------------------------------------------
1503 This document details the changes between this version, bash-2.04-devel,
1504 and the previous version, bash-2.03-release.
1508 a. System-specific configuration and source changes for: Interix, Rhapsody
1510 b. Fixed a bug in execute_cmd.c that resulted in a compile-time error if
1511 JOB_CONTROL was not defined.
1513 c. An obscure race condition in the trap code was fixed.
1515 d. The string resulting from $'...' is now requoted to avoid any further
1518 e. The $'...' quoting syntax now allows backslash to escape a single quote,
1519 for ksh-93 compatibility.
1521 f. The $"..." quoting syntax now escapes backslashes and double quotes in
1522 the translated string when displaying them with the --dump-po-strings
1525 g. `echo -e' no longer converts \' to '.
1527 h. Fixes were made to the extended globbing code to handle embedded (...)
1530 i. Some improvements were made to the code that unsets `nodelay' mode on
1531 the file descriptor from which bash is reading input.
1533 j. Some changes were made to the replacement termcap library for better
1534 operation on MS-DOS.
1536 k. Some changes were made to the tilde expansion code to handle backslash
1537 as a pathname separator on MS-DOS.
1539 l. The source has been reorganized a little bit -- there is now an `include'
1540 subdirectory, and lib/posixheaders has been removed.
1542 m. Improvements were made to the `read' builtin so that it makes many
1543 fewer read(2) system calls.
1545 n. The expansion of $- will include `c' and `s' when those options are
1546 supplied at shell invocation.
1548 o. Several improvments were made to the completion code: variable completion
1549 now works better when there are unterminated expansions, command
1550 completion understands quotes better, and completion now works in certain
1551 unclosed $(... constructs.
1553 p. The arithmetic expansion code was fixed to not need the value of a
1554 variable being assigned a value (fixes the "ss=09; let ss=10" bug).
1556 q. Some changes were made to make exported environment creation faster.
1558 r. The html documentation will be installed into $(htmldir) if that variable
1559 has a value when `make install' is run.
1561 s. Fixed a bug that would cause the bashrc file to be sourced inappropriately
1562 when bash is started by sshd.
1564 t. The SSH_CLIENT environment variable is no longer auto-exported.
1566 u. A bug that caused redirections with (...) subshells to be performed in
1567 the wrong order was fixed.
1569 v. A bug that occasionally caused inappropriate expansion of assignment
1570 statements in compound array assignments was fixed.
1572 w. The code that parses the words in a compound array assignment was
1573 simplified considerably and should work better now.
1575 x. Fixes to the non-job-control code in nojobs.c to make it POSIX.2-compliant
1576 when a user attempts to retrieve the status of a terminated background
1579 y. Fixes to the `printf' builtin so that it doesn't try to expand all
1580 backslash escape sequences in the format string before parsing it for
1581 % format specifiers.
1583 2. Changes to Readline
1585 a. The history library tries to truncate the history file only if it is a
1588 b. A bug that caused _rl_dispatch to address negative array indices on
1589 systems with signed chars was fixed.
1591 c. rl-yank-nth-arg now leaves the history position the same as when it was
1594 d. Changes to the completion code to handle MS-DOS drive-letter:pathname
1597 e. Completion is now case-insensitive by default on MS-DOS.
1599 f. Fixes to the history file manipulation code for MS-DOS.
1601 g. Readline attempts to bind the arrow keys to appropriate defaults on MS-DOS.
1603 h. Some fixes were made to the redisplay code for better operation on MS-DOS.
1605 i. The quoted-insert code will now insert tty special chars like ^C.
1607 j. A bug was fixed that caused the display code to reference memory before
1608 the start of the prompt string.
1610 k. More support for __EMX__ (OS/2).
1612 l. A bug was fixed in readline's signal handling that could cause infinite
1613 recursion in signal handlers.
1615 m. A bug was fixed that caused the point to be less than zero when rl_forward
1616 was given a very large numeric argument.
1618 n. The vi-mode code now gets characters via the application-settable value
1619 of rl_getc_function rather than calling rl_getc directly.
1621 3. New Features in Bash
1623 a. The history builtin has a `-d offset' option to delete the history entry
1624 at position `offset'.
1626 b. The prompt expansion code has two new escape sequences: \j, the number of
1627 active jobs; and \l, the basename of the shell's tty device name.
1629 c. The `bind' builtin has a new `-x' option to bind key sequences to shell
1632 d. There is a new shell option, no_empty_command_completion, which, when
1633 enabled, disables command completion when TAB is typed on an empty line.
1635 e. The `help' builtin has a `-s' option to just print a builtin's usage
1638 f. There are several new arithmetic operators: id++, id-- (variable
1639 post-increment/decrement), ++id, --id (variabl pre-increment/decrement),
1640 expr1 , expr2 (comma operator).
1642 g. There is a new ksh-93 style arithmetic for command:
1643 for ((expr1 ; expr2; expr3 )); do list; done
1645 h. The `read' builtin has a number of new options:
1646 -t timeout only wait timeout seconds for input
1647 -n nchars only read nchars from input instead of a full line
1648 -d delim read until delim rather than newline
1649 -s don't echo input chars as they are read
1651 i. The redirection code now handles several filenames specially:
1652 /dev/fd/N, /dev/stdin, /dev/stdout, and /dev/stderr, whether or
1653 not they are present in the file system.
1655 j. The redirection code now recognizes pathnames of the form
1656 /dev/tcp/host/port and /dev/udp/host/port, and tries to open a socket
1657 of the appropriate type to the specified port on the specified host.
1659 k. The ksh-93 ${!prefix*} expansion, which expands to the names of all
1660 shell variables whose names start with prefix, has been implemented.
1662 l. There is a new dynamic variable, FUNCNAME, which expands to the name of
1663 a currently-executing function. Assignments to FUNCNAME have no effect.
1665 m. The GROUPS variable is no longer readonly; assignments to it are silently
1666 discarded. This means it can be unset.
1668 4. New Features in Readline
1670 a. Parentheses matching is now always compiled into readline, and enabled
1671 or disabled when the value of the `blink-matching-paren' variable is
1674 b. MS-DOS systems now use ~/_inputrc as the last-ditch inputrc filename.
1676 c. MS-DOS systems now use ~/_history as the default history file.
1678 d. history-search-{forward,backward} now leave the point at the end of the
1679 line when the string to search for is empty, like
1680 {reverse,forward}-search-history.
1682 e. history-search-{forward,backward} now leave the last history line found
1683 in the readline buffer if the second or subsequent search fails.
1685 f. New function for use by applications: rl_on_new_line_with_prompt, used
1686 when an application displays the prompt itself before calling readline().
1688 g. New variable for use by applications: rl_already_prompted. An application
1689 that displays the prompt itself before calling readline() must set this to
1692 ------------------------------------------------------------------------------
1693 This document details the changes between this version, bash-2.03-release,
1694 and the previous version, bash-2.03-beta2.
1698 a. A file descriptor leak in the `fc' builtin was fixed.
1700 b. A bug was fixed in the `read' builtin that caused occasional spurious
1701 failures when using `read -e'.
1703 c. The version code needed to use the value of the cpp variable
1704 CONF_MACHTYPE rather than MACHTYPE.
1706 d. A new test was added to exercise the command printing and copying code.
1708 e. A bug was fixed that caused `time' to be recognized as a reserved word
1709 if it was the first pattern in a `case' statement pattern list.
1711 ------------------------------------------------------------------------------
1712 This document details the changes between this version, bash-2.03-beta2,
1713 and the previous version, bash-2.03-beta1.
1717 a. Slight additions to support/shobj-conf, mostly for the benefit of AIX 4.2.
1719 b. config.{guess,sub} support added for the NEC SX4.
1721 c. Changed some of the cross-compiling sections of the configure macros in
1722 aclocal.m4 so that configure won't abort.
1724 d. Slight changes to how the HTML versions of the bash and readline manuals
1727 e. Fixed conditional command printing to avoid interpreting printf `%'-escapes
1730 f. Don't include the bash malloc on all variants of the alpha processor.
1732 g. Changes to configure to make --enable-profiling work on Solaris 2.x.
1734 h. Fixed a bug that manifested itself when shell functions were called
1735 between calls to `getopts'.
1737 i. Fixed pattern substitution so that a bare `#'as a pattern causes the
1738 replacement string to be prefixed to the search string, and a bare
1739 `%' causes the replacement string to be appended to the search string.
1741 j. Fixed a bug in the command execution code that caused child processes
1742 to occasionally have the wrong value for $!.
1744 2. Changes to Readline
1746 a. Added code to the history library to catch history substitutions using
1747 `&' without a previous history substitution or search having been
1750 3. New Features in Bash
1752 4. New Features in Readline
1754 a. New bindable variable: `isearch-terminators'.
1756 b. New bindable function: `forward-backward-delete-char' (unbound by default).
1758 ------------------------------------------------------------------------------
1759 This document details the changes between this version, bash-2.03-beta1,
1760 and the previous version, bash-2.03-alpha.
1764 a. A change was made to the help text for `{...}' to make it clear that a
1765 semicolon is required before the closing brace.
1767 b. A fix was made to the `test' builtin so that syntax errors cause test
1768 to return an exit status > 1.
1770 c. Globbing is no longer performed on assignment statements that appear as
1771 arguments to `assignment builtins' such as `export'.
1773 d. System-specific configuration changes were made for: Rhapsody,
1774 AIX 4.2/gcc, BSD/OS 4.0.
1776 e. New loadable builtins: ln, unlink.
1778 f. Some fixes were made to the globbing code to handle extended glob patterns
1779 which immediately follow a `*'.
1781 g. A fix was made to the command printing code to ensure that redirections
1782 following compound commands have a space separating them from the rest
1785 h. The pathname canonicalization code was changed to produce fewer leading
1786 `//' sequences, since those are interpreted as network file system
1787 pathnames on some systems.
1789 i. A fix was made so that loops containing `eval' commands in commands passed
1790 to `bash -c' would not exit prematurely.
1792 j. Some changes were made to the job reaping code when the shell is not
1793 interactive, so the shell will retain exit statuses longer for examination
1796 k. A fix was made so that `jobs | command' works again.
1798 l. The erroneous compound array assignment var=((...)) is now a syntax error.
1800 m. A change was made to the dynamic loading code in `enable' to support
1803 n. A fix was made to the globbing code so that extended globbing patterns
1804 will correctly match `.' in a bracket expression.
1806 2. Changes to Readline
1808 a. A fix was made to the completion code in which a typo caused the wrong
1809 value to be passed to the function that computed the longest common
1810 prefix of the list of matches.
1812 b. The completion code now checks the value of rl_filename_completion_desired,
1813 which is set by application-supplied completion functions to indicate
1814 that filename completion is being performed, to decide whether or not to
1815 call an application-supplied `ignore completions' function.
1817 3. New Features in Bash
1819 a. A change was made to the startup file code so that any shell begun with
1820 the `--login' option, even non-interactive shells, will source the login
1821 shell startup files.
1823 4. New Features in Readline
1825 a. A new variable, rl_erase_empty_line, which, if set by an application using
1826 readline, will cause readline to erase, prompt and all, lines on which the
1827 only thing typed was a newline.
1829 ------------------------------------------------------------------------------
1830 This document details the changes between this version, bash-2.03-alpha,
1831 and the previous version, bash-2.02.1-release.
1835 a. System-specific configuration changes were made for: Irix 6.x, Unixware 7.
1837 b. The texi2dvi and texi2html scripts were updated to the latest versions
1840 c. The configure tests that determine which native type is 32 bits were
1841 changed to not require a compiled program.
1843 d. Fixed a bug in shell_execve that could cause memory to be freed twice
1844 after a failed exec.
1846 e. The `printf' test uses `diff -a' if it's available to prevent confusion
1847 due to the non-ascii output.
1849 f. Shared object configuration is now performed by a shell script,
1850 support/shobj-conf, which generates values to be substituted into
1851 makefiles by configure.
1853 g. Some changes were made to `ulimit' to avoid the use of RLIM_INVALID as a
1856 h. Changes were made to `ulimit' to work around HPUX 9.x's peculiar
1857 handling of RLIMIT_FILESIZE.
1859 i. Some new loadable builtins were added: id, printenv, sync, whoami, push,
1860 mkdir. `pushd', `popd', and `dirs' can now be built as regular or
1861 loadable builtins from the same source file.
1863 j. Changes were made to `printf' to handle NUL bytes in the expanded format
1866 k. The various `make clean' Makefile targets now descend into lib/sh.
1868 l. The `type' builtin was changed to use the internal `getopt' so that things
1869 like `type -ap' work as expected.
1871 m. There is a new configuration option, --with-installed-readline, to link
1872 bash with a locally-installed version of readline. Only readline version
1873 4.0 and later releases can support this. Shared and static libraries
1874 are supported. The installed include files are used.
1876 n. There is a new autoconf macro used to find which basic type is 64 bits.
1878 o. Dynamic linking and loadable builtins should now work on SCO 3.2v5*,
1879 AIX 4.2 with gcc, Unixware 7, and many other systems using gcc, where
1880 the `-shared' options works correctly.
1882 p. A bug was fixed in the bash filename completion code that caused memory to
1883 be freed twice if a directory name containing an unset variable was
1884 completed and the -u option was set.
1886 q. The prompt expansion code now quotes the `$' in the `\$' expansion so it
1887 is not processed by subsequent parameter expansion.
1889 r. Fixed a parsing bug that caused a single or double quote after a `$$' to
1890 trigger ANSI C expansion or locale translation.
1892 s. Fixed a bug in the globbing code that caused quoted filenames containing
1893 no globbing characters to sometimes be incorrectly expanded.
1895 t. Changes to the default prompt strings if prompt string decoding is not
1896 compiled into the shell.
1898 u. Added `do', `then', `else', `{', and `(' to the list of keywords that may
1899 precede the `time' reserved word.
1901 v. The shell may now be cross-built for BeOS as well as cygwin32.
1903 w. The conditional command execution code now treats `=' the same as `=='
1904 for deciding when to perform pattern matching.
1906 x. The `-e' option no longer causes the shell to exit if a command exits
1907 with a non-zero status while running the startup files.
1909 y. The `printf' builtin no longer dumps core if a modifier is supplied in
1910 the format string without a conversion character (e.g. `%h').
1912 z. Array assignments of the form a=(...) no longer show up in the history
1915 aa. The parser was fixed to obey the POSIX.2 rules for finding the closing
1916 `}' in a ${...} expression.
1918 bb. The history file is now opened with mode 0600 rather than 0666, so bash
1919 no longer relies on the user's umask being set appropriately.
1921 cc. Setting LANG no longer causes LC_ALL to be assigned a value; bash now
1922 relies on proper behavior from the C library.
1924 dd. Minor changes were made to allow quoted variable expansions using
1925 ${...} to be completed correctly if there is no closing `"'.
1927 ee. Changes were made to builtins/Makefile.in so that configuring the shell
1928 with `--enable-profiling' works right and builtins/mkbuiltins is
1931 2. Changes to Readline
1933 a. The version number is now 4.0.
1935 b. There is no longer any #ifdef SHELL code in the source files.
1937 c. Some changes were made to the key binding code to fix memory leaks and
1938 better support Win32 systems.
1940 d. Fixed a silly typo in the paren matching code -- it's microseconds, not
1943 e. The readline library should be compilable by C++ compilers.
1945 f. The readline.h public header file now includes function prototypes for
1946 all readline functions, and some changes were made to fix errors in the
1947 source files uncovered by the use of prototypes.
1949 g. The maximum numeric argument is now clamped at 1000000.
1951 h. Fixes to rl_yank_last_arg to make it behave better.
1953 i. Fixed a bug in the display code that caused core dumps if the prompt
1954 string length exceeded 1024 characters.
1956 j. The menu completion code was fixed to properly insert a single completion
1957 if there is only one match.
1959 k. A bug was fixed that caused the display code to improperly display tabs
1962 3. New Features in Bash
1964 a. New `shopt' option, `restricted_shell', indicating whether or not the
1965 shell was started in restricted mode, for use in startup files.
1967 b. Filename generation is now performed on the words between ( and ) in
1968 array assignments (which it probably should have done all along).
1970 c. OLDPWD is now auto-exported, as POSIX.2 seems to require.
1972 d. ENV and BASH_ENV are read-only variables in a restricted shell.
1974 4. New Features in Readline
1976 a. Many changes to the signal handling:
1977 o Readline now catches SIGQUIT and cleans up the tty before returning;
1978 o A new variable, rl_catch_signals, is available to application writers
1979 to indicate to readline whether or not it should install its own
1980 signal handlers for SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP,
1981 SIGTTIN, and SIGTTOU;
1982 o A new variable, rl_catch_sigwinch, is available to application
1983 writers to indicate to readline whether or not it should install its
1984 own signal handler for SIGWINCH, which will chain to the calling
1985 applications's SIGWINCH handler, if one is installed;
1986 o There is a new function, rl_free_line_state, for application signal
1987 handlers to call to free up the state associated with the current
1988 line after receiving a signal;
1989 o There is a new function, rl_cleanup_after_signal, to clean up the
1990 display and terminal state after receiving a signal;
1991 o There is a new function, rl_reset_after_signal, to reinitialize the
1992 terminal and display state after an application signal handler
1993 returns and readline continues
1995 b. There is a new function, rl_resize_terminal, to reset readline's idea of
1996 the screen size after a SIGWINCH.
1998 c. New public functions: rl_save_prompt and rl_restore_prompt. These were
1999 previously private functions with a `_' prefix.
2001 d. New function hook: rl_pre_input_hook, called just before readline starts
2002 reading input, after initialization.
2004 e. New function hook: rl_display_matches_hook, called when readline would
2005 display the list of completion matches. The new function
2006 rl_display_match_list is what readline uses internally, and is available
2007 for use by application functions called via this hook.
2009 f. New bindable function, delete-char-or-list, like tcsh.
2011 ------------------------------------------------------------------------------
2012 This document details the changes between this version, bash-2.02.1-release,
2013 and the previous version, bash-2.02-release.
2017 a. A bug that caused the bash readline support to not compile unless aliases
2018 and csh-style history were configured into the shell was fixed.
2020 b. Fixed a bug that could cause a core dump when here documents contained
2021 more than 1000 characters.
2023 c. Fixed a bug that caused a CDPATH entry of "" to not be treated the same
2024 as the current directory when in POSIX mode.
2026 d. Fixed an alignment problem with the memory returned by the bash malloc,
2027 so returned memory is now 64-bit aligned.
2029 e. Fixed a bug that caused command substitutions executed within pipelines
2030 to put the terminal in the wrong process group.
2032 f. Fixes to support/config.sub for: alphas, SCO Open Server and Open Desktop,
2033 Unixware 2, and Unixware 7.
2035 g. Fixes to the pattern matching code to make it work correctly for eight-bit
2038 h. Fixed a problem that occasionally caused the shell to display the wrong
2039 value for the new working directory when changing to a directory found
2040 in $CDPATH when in physical mode.
2042 i. Fixed a bug that caused core dumps when using conditional commands in
2045 j. Fixed a bug that caused the printf builtin to loop forever if the format
2046 string did not consume any of the arguments.
2048 k. Fixed a bug in the parameter expansion code that caused "$@" to be
2049 incorrectly split if $IFS did not contain a space character.
2051 l. Fixed a bug that could cause a core dump when completing hostnames if
2052 the number of matching hostnames was an exact multiple of 16.
2054 m. Fixed a bug that caused the shell to fork too early when a command
2055 such as `%2 &' was given.
2057 2. Changes to Readline
2059 a. Fixed a problem with redisplay that showed up when the prompt string was
2060 longer than the screen width and the prompt contained invisible characters.
2062 ------------------------------------------------------------------------------
2063 This document details the changes between this version, bash-2.02-release,
2064 and the previous version, bash-2.02-beta2.
2068 a. A bug was fixed that caused the terminal process group to be set
2069 incorrectly when performing command substitution of builtins in a
2072 ------------------------------------------------------------------------------
2073 This document details the changes between this version, bash-2.02-beta2,
2074 and the previous version, bash-2.02-beta1.
2078 a. Attempting to `wait' for stopped jobs now generates a warning message.
2080 b. Pipelines which exit due to SIGPIPE in non-interactive shells are now
2081 not reported if the shell is compiled -DDONT_REPORT_SIGPIPE.
2083 c. Some changes were made to builtins/psize.sh and support/bashbug.sh to
2084 attempt to avoid some /tmp file races and surreptitious file
2087 d. Fixed a bug that caused the shell not to compile if configured with
2088 dparen arithmetic but without aliases.
2090 e. Fixed a bug that caused the input stream to be switched when assigning
2091 empty arrays with `bash -c'.
2093 f. A bug was fixed in the readline expansion glue code that caused bash to
2094 dump core when expanding lines with an unclosed single quote.
2096 g. A fix was made to the `cd' builtin so that using a non-empty directory
2097 from $CDPATH results in an absolute pathname of the new current working
2098 directory to be displayed after the current directory is changed.
2100 h. Fixed a bug in the variable assignment code that caused the shell to
2101 dump core when referencing an unset variable with `set -u' enabled in
2102 an assignment statement preceding a command.
2104 i. Fixed a bug in the exit trap code that caused reserved words to not be
2105 recognized under certain circumstances.
2107 j. Fixed a bug in the parameter pattern substitution code so that quote
2108 removal is performed.
2110 k. The shell should now configure correctly on Apple Rhapsody systems.
2112 l. The `kill' builtin now prints a usage message if it is not passed any
2115 ------------------------------------------------------------------------------
2116 This document details the changes between this version, bash-2.02-beta1,
2117 and the previous version, bash-2.02-alpha1.
2121 a. A few compilation bugs were fixed in the new extended globbing code.
2123 b. Executing arithmetic commands now sets the command name to `((' so
2124 error messages look right.
2126 c. Fixed some build problems with various configuration options.
2128 d. The `printf' builtin now aborts immediately if an illegal format
2129 character is encountered.
2131 e. The code that creates here-documents now behaves better if the file it's
2132 trying to create already exists for some reason.
2134 f. Fixed a problem with the extended globbing code that made patterns like
2135 `x+*' expand incorrectly.
2137 g. The prompt string expansion code no longer quotes tildes with backslashes.
2139 h. The bash getcwd() implementation in lib/sh/getcwd.c now behaves better in
2140 the presence of lstat(2) failures.
2142 i. Fixed a bug with strsub() that caused core dumps when executing `fc -s'.
2144 j. The mail checking code now ensures that it has a valid default mailpath.
2146 k. A bug was fixed that caused local variables to be unset inappropriately
2147 when sourcing a script from within another sourced script.
2149 l. A bug was fixed in the history saving code so that functions are saved
2150 in the history list correctly if `cmdhist' is enabled, but `lithist'
2153 m. A bug was fixed that caused printf overflows when displaying error
2156 n. It should be easier to build the loadble builtins in examples/loadables,
2157 though some manual editing of the generated Makefile is still required.
2159 o. The user's primary group is now always ${GROUPS[0]}.
2161 p. Some updates were made to support/config.guess from the GNU master copy.
2163 q. Some changes were made to the autoconf support for Solaris 2.6 large
2166 r. The `command' builtins now does the right thing when confstr(3) cannot
2167 find a value for _CS_PATH.
2169 s. Extended globbing expressions like `*.!(c)' are not history expanded if
2170 `extglob' is enabled.
2172 t. Using the `-P' option to `cd' will force the value that is assigned to
2173 PWD to not contain any symbolic links.
2175 2. Changes to Readline
2177 a. The code that prints completion listings now behaves better if one or
2178 more of the filenames contains non-printable characters.
2180 b. The time delay when showing matching parentheses is now 0.5 seconds.
2182 ------------------------------------------------------------------------------
2183 This document details the changes between this version, bash-2.02-alpha1,
2184 and the previous version, bash-2.01.1-release.
2188 a. OS-specific configuration changes for: BSD/OS 3.x, Minix 2.x,
2189 Solaris 2.6, SINIX SVR4.
2191 b. Changes were made to the generated `info' files so that `install-info'
2194 c. PWD is now auto-exported.
2196 d. A fix was made to the pipeline code to make sure that the shell forks
2197 to execute simple commands consisting solely of assignment statements.
2199 e. Changes to the test suite for systems with 14-character filenames.
2201 f. The default sizes of some internal hash tables have been made smaller
2202 to reduce the shell's memory footprint.
2204 g. The `((...))' arithmetic command is now executed directly instead of
2205 being translated into `let "..."'.
2207 h. Fixes were made to the expansion code so that "$*", "$@", "${array[@]}",
2208 and "${array[@]}" expand correctly when IFS does not contain a space
2209 character, is unset, or is set to NULL.
2211 i. The indirect expansion code (${!var}) was changed so that the only
2212 valid values of `var' are variable names, positional parameters, `#',
2215 j. An arithmetic expression error in a $((...)) expansion now causes a
2216 non-interactive shell running in posix mode to exit.
2218 k. Compound array assignment now splits the words within the parentheses
2219 on shell metacharacters like the parser would before expansing them
2220 and performing the assignment. This is for compatibility with ksh-93.
2222 l. The internal shell backslash-quoting code (used in the output of `set'
2223 and completion) now quotes tildes if they appear at the start of the
2224 string or after a `=' or `:'.
2226 m. A couple of bugs with `shopt -o' were fixed.
2228 n. `bash +o' now displays the same output as `set +o' before starting an
2231 o. A bug that caused command substitution and the `eval' builtin to
2232 occasionally free memory twice when an error was encountered was fixed.
2234 p. The filename globbing code no longer requires read permission for a
2235 directory when the filename to be matched does not contain any globbing
2236 characters, as POSIX.2 specifies.
2238 q. A bug was fixed so that the job containing the last asynchronous
2239 process is not removed from the job table until a `wait' is executed
2240 for that process or another asynchronous process is started. This
2241 satisfies a POSIX.2 requirement.
2243 r. A `select' bug was fixed so that a non-numeric user response is treated
2244 the same as a numeric response that is out of range.
2246 s. The shell no longer parses the value of SHELLOPTS from the environment
2247 if it is restricted, running setuid, or running in `privileged mode'.
2249 t. Fixes were made to enable large file support on systems such as
2250 Solaris 2.6, where the size of a file may be larger than can be held
2253 u. The filename hashing code was fixed to not add `./' to the beginning of
2254 filenames which already begin with `./'.
2256 v. The configure script was changed so that the GNU termcap library is not
2257 compiled in if `prefer-curses' has been specified.
2259 w. HISTCONTROL and HISTIGNORE are no longer applied to the second and
2260 subsequent lines of a multi-line command.
2262 x. A fix was made to `disown' so that it does a better job of catching
2265 y. Non-interactive shells no longer report the status of processes terminated
2266 due to SIGINT, even if the standard output is a terminal.
2268 z. A bug that caused the output of `jobs' to have extra carriage returns
2271 aa. A bug that caused PIPESTATUS to not be set when builtins or shell
2272 functions were executed in the foreground was fixed.
2274 bb. Bash now attempts to detect when it is being run by sshd, and treats
2275 that case identically to being run by rshd.
2277 cc. A bug that caused `set -a' to export SHELLOPTS when one of the shell
2278 options was changed was fixed.
2280 dd. The `kill' builtin now disallows empty or missing process id arguments
2281 instead of treating them as identical to `0', which means the current
2284 ee. `var=value declare -x var' now behaves identically to
2285 `var=value export var'. Similarly for `var=value declare -r var' and
2286 `var=value readonly var'.
2288 ff. A few memory leaks were fixed.
2290 gg. `alias' and `unalias' now print error messages when passed an argument
2291 that is not an alias for printing or deletion, even when the shell is
2292 not interactive, as POSIX.2 specifies.
2294 hh. `alias' and `alias -p' now return a status of 0 when no aliases are
2295 defined, as POSIX.2 specifes.
2297 ii. `cd -' now prints the pathname of the new working directory if the shell
2300 jj. A fix was made so that the code that binds $PWD now copes with getcwd()
2303 kk. `unset' now checks whether or not a function name it's trying to unset
2304 is a valid shell identifier only when the shell is running in posix mode.
2306 ll. A change was made to the code that generates filenames for here documents
2307 to make them less prone to name collisions.
2309 mm. The parser was changed so that `time' is recognized as a reserved word
2310 only at the beginning of a pipeline.
2312 nn. The pathname canonicalization code was changed so that `//' is converted
2313 into `/', but all other pathnames beginning with `//' are left alone, as
2316 oo. The `logout' builtin will no longer exit a non-interactive non-login
2319 2. Changes to Readline
2321 a. Fixed a problem in the readline test program rltest.c that caused a core
2324 b. The code that handles parser directives in inputrc files now displays
2325 more error messages.
2327 c. The history expansion code was fixed so that the appearance of the
2328 history comment character at the beginning of a word inhibits history
2329 expansion for that word and the rest of the input line.
2331 3. New Features in Bash
2333 a. A new version of malloc, based on the older GNU malloc, that has many
2334 changes, is more page-based, is more conservative with memory usage,
2335 and does not `orphan' large blocks when they are freed.
2337 b. A new version of gmalloc, based on the old GLIBC malloc, with many
2338 changes and range checking included by default.
2340 c. A new implementation of fnmatch(3) that includes full POSIX.2 Basic
2341 Regular Expression matching, including character classes, collating
2342 symbols, equivalence classes, and support for case-insensitive pattern
2345 d. ksh-88 egrep-style extended pattern matching ([@+*?!](patlist)) has been
2346 implemented, controlled by a new `shopt' option, `extglob'.
2348 e. There is a new ksh-like `[[' compound command, which implements
2349 extended `test' functionality.
2351 f. There is a new `printf' builtin, implemented according to the POSIX.2
2354 g. There is a new feature for command substitution: $(< filename) now expands
2355 to the contents of `filename', with any trailing newlines removed
2356 (equivalent to $(cat filename)).
2358 h. There are new tilde prefixes which expand to directories from the
2361 i. There is a new `**' arithmetic operator to do exponentiation.
2363 j. There are new configuration options to control how bash is linked:
2364 `--enable-profiling', to allow bash to be profiled with gprof, and
2365 `--enable-static-link', to allow bash to be linked statically.
2367 k. There is a new configuration option, `--enable-cond-command', which
2368 controls whether or not the `[[' command is included. It is on by
2371 l. There is a new configuration option, `--enable-extended-glob', which
2372 controls whether or not the ksh extended globbing feature is included.
2373 It is enabled by default.
2375 m. There is a new configuration #define in config.h.top that, when enabled,
2376 will cause all login shells to source /etc/profile and one of the user-
2377 specific login shell startup files, whether or not the shell is
2380 n. There is a new invocation option, `--dump-po-strings', to dump
2381 a shell script's translatable strings ($"...") in GNU `po' format.
2383 o. There is a new `shopt' option, `nocaseglob', to enable case-insensitive
2384 pattern matching when globbing filenames and using the `case' construct.
2386 p. There is a new `shopt' option, `huponexit', which, when enabled, causes
2387 the shell to send SIGHUP to all jobs when an interactive login shell
2390 q. `bind' has a new `-u' option, which takes a readline function name as an
2391 argument and unbinds all key sequences bound to that function in a
2394 r. `disown' now has `-a' and `-r' options, to limit operation to all jobs
2395 and running jobs, respectively.
2397 s. The `shopt' `-p' option now causes output to be displayed in a reusable
2400 t. `test' has a new `-N' option, which returns true if the filename argument
2401 has been modified since it was last accessed.
2403 u. `umask' now has a `-p' option to print output in a reusable format.
2405 v. A new escape sequence, `\xNNN', has been added to the `echo -e' and $'...'
2406 translation code. It expands to the character whose ascii code is NNN
2409 w. The prompt string expansion code has a new `\r' escape sequence.
2411 x. The shell may now be cross-compiled for the CYGWIN32 environment on
2414 4. New Features in Readline
2416 a. There is now an option for `iterative' yank-last-arg handline, so a user
2417 can keep entering `M-.', yanking the last argument of successive history
2420 b. New variable, `print-completions-horizontally', which causes completion
2421 matches to be displayed across the screen (like `ls -x') rather than up
2422 and down the screen (like `ls').
2424 c. New variable, `completion-ignore-case', which causes filename completion
2425 and matching to be performed case-insensitively.
2427 d. There is a new bindable command, `magic-space', which causes history
2428 expansion to be performed on the current readline buffer and a space to
2429 be inserted into the result.
2431 e. There is a new bindable command, `menu-complete', which enables tcsh-like
2432 menu completion (successive executions of menu-complete insert a single
2433 completion match, cycling through the list of possible completions).
2435 f. There is a new bindable command, `paste-from-clipboard', for use on Win32
2436 systems, to insert the text from the Win32 clipboard into the editing
2439 g. The key sequence translation code now understands printf-style backslash
2440 escape sequences, including \NNN octal escapes. These escape sequences
2441 may be used in key sequence definitions or macro values.
2443 h. An `$include' inputrc file parser directive has been added.
2445 ------------------------------------------------------------------------------
2446 This document details the changes between this version, bash-2.01.1-release,
2447 and the previous version, bash-2.01-release.
2451 a. The select command was fixed to check the validity of the user's
2452 input more strenuously.
2454 b. A bug was fixed that prevented `time' from timing commands correctly
2455 when supplied as an argument to `bash -c'.
2457 c. A fix was made to the mail checking code to keep from adding the same
2458 mail file to the list of files to check multiple times when parsing
2461 d. Fixed an off-by-one error in the tilde expansion library.
2463 e. When using the compound array assignment syntax, the old value of
2464 the array is cleared before assigning the new value.
2466 f. Fixed a bug that could cause a core dump when a trap handler was reset
2467 to the default in the trap command associated with that signal.
2469 g. Fixed a bug in the locale code that occurred when assigning a value
2472 h. A change was made to the parser so that words of the form xxx=(...)
2473 are not considered compound assignment statements unless there are
2474 characters before the `='.
2476 i. A fix was made to the command tracing code to correctly quote each
2479 j. Some changes were made to the bash-specific autoconf tests to make them
2482 k. Completion of words with globbing characters now correctly quotes the
2485 l. The directory /var/spool/mail is now preferred to /usr/spool/mail when
2486 configure is deciding on the default mail directory.
2488 m. The brace completion code was fixed to not quote the `{' and `}'.
2490 n. Some fixes were made to make $RANDOM more random in subshells.
2492 o. System-specific changes were made to configure for: SVR4.2
2494 p. Changes were made so that completion of words containing globbing chars
2495 substitutes the result only if a single filename was matched.
2497 q. The window size is now recomputed after a job is stopped with SIGTSTP if
2498 the user has set `checkwinsize' with `shopt'.
2500 r. When doing substring expansion, out-of-range substring specifiers now
2501 cause nothing to be substituted rather than an expansion error.
2503 s. A fix was made so that you can no longer trap `SIGEXIT' or `SIGDEBUG' --
2504 only `EXIT' and `DEBUG' are accepted.
2506 t. The display of trapped signals now uses the signal number if signals
2507 for which bash does not know the name are trapped.
2509 u. A fix was made so that `bash -r' does not turn on restricted mode until
2510 after the startup files are executed.
2512 v. A bug was fixed that occasionally caused a core dump when a variable
2513 found in the temporary environment of export/declare/readonly had a
2516 w. A bug that occasionally caused unallocated memory to be passed to free()
2517 when doing arithmetic substitution was fixed.
2519 x. A bug that caused a buffer overrun when expanding a prompt string
2520 containing `\w' and ${#PWD} exceeded PATH_MAX was fixed.
2522 y. A problem with the completion code that occasionally caused it to
2523 refer to a character before the beginning of the readline line buffer
2526 z. A bug was fixed so that the `read' builtin restarts reads when
2527 interrupted by signals other than SIGINT.
2529 aa. Fixed a bug that caused a command to be freed twice when there was
2530 an evaluation error in the `eval' command.
2532 2. Changes to Readline
2534 a. Added a missing `extern' to a declaration in readline.h that kept
2535 readline from compiling cleanly on some systems.
2537 b. The history file is now opened with mode 0600 when it is written for
2540 c. Changes were made to the SIGWINCH handling code so that prompt redisplay
2543 d. ^G now interrupts incremental searches correctly.
2545 e. A bug that caused a core dump when the set of characters to be quoted
2546 when completing words was empty was fixed.
2548 ------------------------------------------------------------------------------
2549 This document details the changes between this version, bash-2.01-release,
2550 and the previous version, bash-2.01-beta2.
2554 a. The `distclean' target should remove the `printenv' executable if it
2557 b. The test suite was changed slightly to ensure that the error messages
2558 are printed in English.
2560 c. A bug that caused the shell to dump core when a filename containing a
2561 `/' was passed to `hash' was fixed.
2563 d. Pathname canonicalization now leaves a leading `//' intact, as POSIX.1
2566 e. A memory leak when completing commands was fixed.
2568 f. A memory leak that occurred when checking the hash table for commands
2569 with relative paths was fixed.
2571 ------------------------------------------------------------------------------
2572 This document details the changes between this version, bash-2.01-beta2,
2573 and the previous version, bash-2.01-beta1.
2577 a. The `ulimit' builtin translates RLIM_INFINITY to the hard limit only if
2578 the current (soft) limit is less than or equal to the hard limit.
2580 b. Fixed a bug that caused the bash emulation of strcasecmp to produce
2583 c. A bug that caused memory to be freed twice when a trap handler resets
2584 the trap more than once was fixed.
2586 d. A bug that caused machines where sizeof (pointer) > sizeof (int) to
2587 fail (and possibly dump core) when trying to unwind-protect a null
2590 e. The startup files should not be run with job control enabled. This fix
2591 allows SIGINT to once again interrupt startup file execution.
2593 f. Bash should not change the SIGPROF handler if it is set to something
2596 g. The completion code that provides bash-specific completions for readline
2597 now quotes characters that the readline code would treat as word break
2598 characters if they appear in a file name.
2600 h. The completion code now correctly quotes filenames containing a `!',
2601 even if the user attempted to use double quotes when attempting
2604 i. A bug that caused the shell to dump core when `disown' was called without
2605 arguments and there was no current job was fixed.
2607 j. A construct like $((foo);bar) is now processed as a command substitution
2608 rather than as a bad arithmetic substitution.
2610 k. A couple of bugs that caused `fc' to not obey the `cmdhist' and `lithist'
2611 shell options when editing and re-executing a series of commands were
2614 l. A fix was made to the grammar -- the list of commands between `do' and
2615 `done' in the body of a `for' command should be treated the same as a
2618 2. Changes to Readline
2620 a. A couple of bugs that caused the history search functions to attempt to
2621 free a NULL pointer were fixed.
2623 b. If the C library provides setlocale(3), readline does not need to look
2624 at various environment variables to decide whether or not to go into
2625 eight-bit mode automatically -- just check whether the current locale
2626 is not `C' or `POSIX'.
2628 c. If the filename completion function finds that a directory was not closed
2629 by a previous (interrupted) completion, it closes the directory with
2632 3. New Features in Bash
2634 a. New bindable readline commands: history-and-alias-expand-line and
2635 alias-expand-line. The code was always in there, there was just no
2638 ------------------------------------------------------------------------------
2639 This document details the changes between this version, bash-2.01-beta1,
2640 and the previous version, bash-2.01-alpha1.
2644 a. Fixed a problem that could cause file descriptors used for process
2645 substitution to conflict with those used explicitly in redirections.
2647 b. Made it easier to regenerate configure if the user changes configure.in.
2649 c. ${GROUPS[0]} should always be the primary group, even on systems without
2652 d. Spelling correction is no longer enabled by default.
2654 e. Fixes to quoting problems in `bashbug'.
2656 f. OS-specific configuration changes were made for: Irix 6.
2658 g. OS-specific code changes were made for: QNX.
2660 h. A more meaningful message is now printed when the file in /tmp for a
2661 here document cannot be created.
2663 i. Many changes to the shell's variable initialization code to speed
2664 non-interactive startup.
2666 j. Changes to the non-job-control code so that it does not try to open
2669 k. The output of `set' and `export' is once again sorted, as POSIX wants.
2671 l. Fixed a problem caused by a recursive call reparsing the value of
2674 m. The tilde code no longer calls getenv() when it's compiled as part of
2675 the shell, which should eliminate problems on systems that cannot
2676 redefine getenv(), like the NeXT OS.
2678 n. Fixed a problem that caused `bash -o' or `bash +o' to not list all
2681 o. Fixed `ulimit' to convert RLIM_INFINITY to the appropriate hard limit
2682 only if the hard limit is greater than the current (soft) limit.
2684 p. Fixed a problem that arose when building bash in a different directory
2685 than the source and y.tab.[ch] were remade with something other than
2686 bison. This came up most often on NetBSD.
2688 q. Fixed a problem with completion -- it thought that `pwd`/[TAB] indicated
2689 an unfinished command completion (`/), which generated errors.
2691 r. The bash special tilde expansions (~-, ~+) are now attempted before
2692 calling the standard tilde expansion code, which should eliminate the
2693 problems people have been seeing with this on Solaris 2.5.1.
2695 s. Added support for <stdarg.h> to places where it was missing.
2697 t. Changed the code that reads the output of a command substitution to not
2698 go through stdio. This reduces the memory requirements and is faster.
2700 u. A number of changes to speed up export environment creation were made.
2702 v. A number of memory leaks were fixed as the result of running the test
2703 scripts through Purify.
2705 w. Fixed a bug that caused subshells forked to interpret executable
2706 scripts without a leading `#!' to not reinitialize the values of
2709 2. Changes to Readline
2711 a. History library has less `#ifdef SHELL' code -- abstracted stuff out
2712 into application-specific function hooks.
2714 b. Readline no longer calls getenv() if it's compiled as part of the shell,
2715 which should eliminate problems on systems that cannot redefine getenv(),
2718 c. Fixed translation of ESC when `untranslating' macro values.
2720 d. The region kill operation now fixes the mark if it ends up beyond the
2721 boundaries of the line after the region is deleted.
2723 3. New Features in Bash
2725 a. New argument for `configure': `--with-curses'. This can be used to
2726 override the selection of the termcap library on systems where it is
2729 ------------------------------------------------------------------------------
2730 This document details the changes between this version, bash-2.01-alpha1,
2731 and the previous version, bash-2.0-release.
2735 a. System-specific configuration changes for: FreeBSD, SunOS4, Irix,
2736 MachTen, QNX 4.2, Harris Night Hawk, SunOS5.
2738 b. System-specific code changes were made for: Linux, 4.4 BSD, QNX 4.2,
2741 c. A bug that caused the exec builtin to fail because the full pathname of
2742 the command could not be found was fixed.
2744 d. The code that performs output redirections is now more resistant to
2745 race conditions and possible security exploits.
2747 e. A bug that caused the shell to dump core when performing pattern
2748 substitutions on variable values was fixed.
2750 f. More hosts are now recognized by the auto-configuration mechanism
2751 (OpenBSD, QNX, others).
2753 g. Assignments to read-only variables that attempt to convert them to
2754 arrays are now errors.
2756 h. A bug that caused shell scripts using array assignments in POSIX mode
2757 to exit after the assignment was performed was fixed.
2759 i. The substring expansion code is now more careful about running off the
2760 ends of the expanded variable value.
2762 j. A bug that caused completion to fail if a backquoted command substitution
2763 appeared anywhere on the line was fixed.
2765 k. The `source' builtin no longer turns off history if it has been enabled
2766 in a non-interactive shell.
2768 l. A bug that caused the shell to crash when `disown' was given a pid
2769 instead of a job number was fixed.
2771 m. The `cd' spelling correction code will not try to change to `.' if no
2772 directory entries match a single-character argument.
2774 n. A bad variable name supplied to `declare', `export', or `readonly' no
2775 longer causes a non-interactive shell in POSIX mode to exit.
2777 o. Some fixes were made to the test suite to handle peculiarities of
2778 various Unix versions.
2780 p. The bash completion code now quotes characters that readline would
2781 treat as word breaks for completion but are not shell metacharacters.
2783 q. Bad options supplied at invocation now cause a usage message to be
2786 r. Fixes were made to the code that handles DEBUG traps so that the trap
2787 string is not freed inappropriately.
2789 s. Some changes were made to the bash debugger in examples/bashdb -- it
2790 should be closer to working now.
2792 t. A problem that caused the default filename used for mail checking to be
2795 u. A fix was made to the `echo' builtin so that NUL characters printed with
2796 `echo -e' do not cause the output to be truncated.
2798 v. A fix was made to the job control code so that the shell behaves better
2799 when monitor mode is enabled in a non-interactive shell.
2801 w. Bash no longer catches all of the terminating signals in a non-
2802 interactive shell until a trap is set on EXIT, which should result in
2805 x. A fix was made to the command timing code so that `time' can be used in
2808 y. A fix was made to the parser so that `((cmd); cmd2)' is now parsed as
2809 a nested subshell rather than strictly as an (erroneous) arithmetic
2812 z. A fix was made to the globbing code so that it correctly matches quoted
2813 filenames beginning with a `.'.
2815 aa. A bug in `fc' that caused some multi-line commands to not be stored as
2816 one command in the history when they were re-executed after editing
2817 (with `fc -e') was fixed.
2819 bb. The `ulimit' builtin now attempts to catch some classes of integer
2822 cc. The command-oriented-history code no longer attempts to add `;'
2823 inappropriately when a newline appears while reading a $(...) command
2826 dd. A bug that caused the shell to dump core when `help --' was executed
2829 ee. A bug that caused the shell to crash when an unset variable appeared
2830 in the body of a here document after `set -u' had been executed was
2833 ff. Implicit input redirections from /dev/null for asynchronous commands
2834 are now handled better.
2836 gg. A bug that caused the shell to fail to compile when configured with
2837 `--disable-readline' was fixed.
2839 hh. The globbing code should now be interruptible.
2841 ii. Bash now notices when the `kill' builtin is used to send SIGCONT to a
2842 stopped job and adjusts the data structures accordingly, as if `bg' had
2843 been executed instead.
2845 jj. A bug that caused the shell to crash when mixing calls to `getopts'
2846 and `shift' on the same set of positional parameters was fixed.
2848 kk. The command printing code now preserves the `-p' flag to `time'.
2850 ll. The command printing code now handles here documents better when there
2851 are other redirections associated with the command.
2853 mm. The special glibc environment variable (NNN_GNU_nonoption_argv_flags_)
2854 is no longer placed into the environment of executed commands -- users
2855 of glibc had too many problems with it.
2857 nn. Reorganized the code that generates signames.h. The signal_names list
2858 is now more complete but may be slightly different (SIGABRT is favored
2859 over SIGIOT, for example). The preferred signal names are those
2860 listed in the POSIX.2 standard.
2862 oo. `bashbug' now uses a filename shorter than 14 characters for its
2863 temporary file, and asks for confirmation before sending the bug
2866 pp. A bug that caused TAB completion in vi editing mode to not be turned
2867 off when `set -o posix' was executed or back on when `set +o posix'
2868 was executed was fixed.
2870 qq. A bug in the brace expansion code that caused brace expansions appearing
2871 in new-style $(...) command substitutions to be inappropriately expanded
2874 rr. A bug in the readline hook shell-expand-line that could cause memory to
2875 be inappropriately freed was fixed.
2877 ss. A bug that caused some arithmetic expressions containing `&&' and `||'
2878 to be parsed with the wrong precedence has been fixed.
2880 tt. References to unbound variables after `set -u' has been executed now
2881 cause the shell to exit immediately, as they should.
2883 uu. A bug that caused the shell to exit inappropriately when `set -e' had
2884 been executed and a command's return status was being inverted with the
2885 `!' reserved word was fixed.
2887 vv. A bug that could occasionally cause the shell to crash with a
2888 divide-by-zero error when timing a command was fixed.
2890 ww. A bug that caused parameter pattern substitution to leave stray
2891 backslashes in the replacement string when the expression is in
2892 double quotes was fixed.
2894 xx. The `break' and `continue' builtins now break out of all loops when an
2895 invalid count argument is supplied.
2897 yy. Fixed a bug that caused PATH to be set to the empty string if
2898 `command -p' is executed with PATH unset.
2900 zz. Fixed `kill -l signum' to print the signal name without the `SIG' prefix,
2903 aaa. Fixed a bug that caused the shell to crash while setting $SHELLOPTS
2904 if there were no shell options set.
2906 bbb. Fixed `export -p' and `readonly -p' so that when the shell is in POSIX
2907 mode, their output is as POSIX.2 specifies.
2909 ccc. Fixed a bug in `readonly' so that `readonly -a avar=(...)' actually
2910 creates an array variable.
2912 ddd. Fixed a bug that prevented `time' from correctly timing background
2915 2. Changes to Readline
2917 a. A bug that caused an extra newline to be printed when the cursor was on
2918 an otherwise empty line was fixed.
2920 b. An instance of memory being used after it was freed was corrected.
2922 c. The redisplay code now works when the prompt is longer than the screen
2925 d. `dump-macros' is now a bindable name, as it should have been all along.
2927 e. Non-printable characters are now expanded when displaying macros and
2930 f. The `dump-variables' and `dump-macros' commands now output a leading
2931 newline if they're called as the result of a key sequence, rather
2932 than directly by an application.
2934 3. New Features in Bash
2936 a. There is a new builtin array variable: GROUPS, the set of groups to which
2937 the user belongs. This is used by the test suite.
2939 4. New Features in Readline
2941 a. If a key sequence bound to `universal-argument' is read while reading a
2942 numeric argument started with `universal-argument', it terminates the
2943 argument but is otherwise ignored. This provides a way to insert multiple
2944 instances of a digit string, and is how GNU emacs does it.
2946 ------------------------------------------------------------------------------
2947 This document details the changes between this version, bash-2.0-release,
2948 and the previous version, bash-2.0-beta3.
2952 a. Fix to the `getopts' builtin so that it does the right thing when a
2953 required option argument is not present.
2955 b. The completion code now updates the common prefix of matched names
2956 after FIGNORE processing is done, since any names that were removed
2957 may have changed the common prefix.
2959 c. Fixed a bug that made messages in MAILPATH entries not work correctly.
2961 d. Fixed a serious documentation error in the description of the new
2962 ${parameter:offset[:length]} expansion.
2964 e. Fixes to make parameter substring expansion ({$param:offset[:length]})
2965 work when within double quotes.
2967 f. Fixes to make ^A (CTLESC) survive an unquoted expansion of positional
2970 g. Corrected a misspelling of `unlimited' in the output of `ulimit'.
2972 h. Fixed a bug that caused executable scripts without a leading `#!' to
2973 occasionally pick up the wrong set of positional parameters.
2975 i. Linux systems now have a working `ulimit -v', using RLIMIT_AS.
2977 j. Updated config.guess so that many more machine types are recognized.
2979 k. Fixed a bug with backslash-quoted slashes in the ${param/pat[/sub]}
2982 l. If the shell is named `-su', and `-c command' is supplied, read and
2983 execute the login shell startup files even though the shell is not
2984 interactive. This is to support the `-' option to `su'.
2986 m. Fixed a bug that caused core dumps when the DEBUG trap was ignored
2987 with `trap "" DEBUG' and a shell function was subsequently executed.
2989 n. Fixed a bug that caused core dumps in the read builtin when IFS was
2990 set to the null string and the input had leading whitespace.
2992 2. Changes to Readline
2994 a. Fixed a bug that caused a numeric argument of 1024 to be ignored when
2997 b. Fixed the display code so that the numeric argument is displayed as it's
3000 c. Fixed the numeric argument reading code so that `M-- command' is
3001 equivalent to `M--1 command', as the prompt implies.
3003 3. New Features in Bash
3005 a. `ulimit' now sets both hard and soft limits and reports the soft limit
3006 by default (when neither -H nor -S is specified). This is compatible
3007 with versions of sh and ksh that implement `ulimit'.
3009 b. Integer constants have been extended to base 64.
3011 4. New Features in Readline
3013 a. The `home' and `end' keys are now bound to beginning-of-line and
3014 end-of-line, respectively, if the corresponding termcap capabilities
3017 ------------------------------------------------------------------------------
3018 This document details the changes between this version, bash-2.0-beta3,
3019 and the previous version, bash-2.0-beta2.
3023 a. System-specific changes for: AIX 4.2, SCO 3.2v[45], HP-UX.
3025 b. When in POSIX mode, variable assignments preceding a special builtin
3026 persist in the shell environment after the builtin completes.
3028 c. Changed all calls to getwd() to getcwd(). Improved check for systems
3029 where the libc getcwd() calls popen(), since that breaks on some
3030 systems when job control is being used.
3032 d. Fixed a bug that caused seg faults when executing scripts with the
3033 execute bit set but without a leading `#!'.
3035 e. The environment passed to executed commands is never sorted.
3037 f. A bug was fixed in the code that expands ${name[@]} to the number of
3038 elements in an array variable.
3040 g. A bug was fixed in the array compound assignment code ( A=( ... ) ).
3042 h. Window size changes now correctly propagate down to readline if
3043 the shopt `checkwinsize' option is enabled.
3045 i. A fix was made in the code that expands to the length of a variable
3048 j. A fix was made to the command builtin so that it did not turn on the
3049 `no fork' flag inappropriately.
3051 k. A fix was made to make `set -n' work more reliably.
3053 l. A fix was made to the job control initialization code so that the
3054 terminal process group is set to the shell's process group if the
3055 shell changes its own process group.
3057 2. Changes to Readline
3059 a. System-specific changes for: SCO 3.2v[45].
3061 b. The behavior of the vi-mode `.' when redoing an `i' command was changed
3062 to insert the text previously inserted by the `i' command rather than
3063 simply entering insert mode.
3065 3. New features in Bash
3067 a. There is a new version of the autoload function package, in
3068 examples/functions/autoload.v2, that uses arrays and provides more
3071 b. Support for LC_COLLATE and locale-specific sorting of the results of
3072 pathname expansion if strcoll() is available.
3074 4. New Features in Readline
3076 a. Support for locale-specific sorting of completion possibilities if
3077 strcoll() is available.
3079 ------------------------------------------------------------------------------
3080 This document details the changes between this version, bash-2.0-beta2,
3081 and the previous version, bash-2.0-beta1.
3085 a. `pushd -' is once again equivalent to `pushd $OLDPWD'.
3087 b. OS-specific changes for: SCO 3.2v[45].
3089 c. A change was made to the fix for the recently-reported security hole
3090 when reading characters with octal value 255 to make it work better on
3091 systems with restartable system calls when not using readline.
3093 d. Some changes were made to the test suite so that it works if you
3094 configure bash with --enable-usg-echo-default.
3096 e. A fix was made to the parsing of conditional arithmetic expressions.
3098 f. Illegal arithmetic bases now cause an arithmetic evaluation error rather
3099 than being silently reset.
3101 g. Multiple arithmetic bases now cause an arithmetic evaluation error
3102 instead of being ignored.
3104 h. A fix was made to the evaluation of ${param?word} to conform to POSIX.2.
3106 i. A bug that sometimes caused array indices to be evaluated twice (which
3107 would cause errors when they contained assignment statements) was fixed.
3109 j. `ulimit' was rewritten to avoid problems with getrlimit(2) returning
3110 unsigned values and to simplify the code.
3112 k. A bug in the command-oriented-history code that caused it to sometimes
3113 put semicolons after right parens inappropriately was fixed.
3115 l. The values inserted into the prompt by the \w and \W escape sequences
3116 are now quoted to prevent further expansion.
3118 m. An interactive shell invoked as `sh' now reads and executes commands
3119 from the file named by $ENV when it starts up. If it's a login shell,
3120 it does this after reading /etc/profile and ~/.profile.
3122 n. The file named by $ENV is never read by non-interactive shells.
3124 2. Changes to Readline
3126 a. A few changes were made to hide some macros and functions that should not
3129 b. An off-by-one error that caused seg faults in the history expansion code
3132 3. New Features in Bash
3134 a. The ksh-style ((...)) arithmetic command was implemented. It is exactly
3135 identical to let "...". This is controlled by a new option to configure,
3136 `--enable-dparen-arithmetic', which is on by default.
3138 b. There is a new #define available in config.h.top: SYS_BASH_LOGOUT. If
3139 defined to a filename, bash reads and executes commands from that file
3140 when a login shell exits. It's commented out by default.
3142 c. `ulimit' has a `-l' option that reports the maximum amount of data that
3143 may be locked into memory on 4.4BSD-based systems.
3145 ------------------------------------------------------------------------------
3146 This document details the changes between this version, bash-2.0-beta1,
3147 and the previous version, bash-2.0-alpha4.
3151 a. A bug that sometimes caused traps to be ignored on signals the
3152 shell treats specially was fixed.
3154 b. The internationalization code was changed to track the values of
3155 LC_* variables and call setlocale() as appropriate. The TEXTDOMAIN
3156 and TEXTDOMAINDIR variables are also tracked; changes cause calls
3157 to textdomain() and bindtextdomain(), if available.
3159 c. A bug was fixed that sometimes caused double-quoted strings to be
3162 d. Changes were made so that the siglist code compiles correctly on
3165 e. Added `:' to the set of characters that cause word breaks for the
3166 completion code so that pathnames in assignments to $PATH can be
3169 f. The `select' command was fixed to print $PS3 to stderr.
3171 g. Fixed an error in the manual page section describing the effect that
3172 setting and unsetting GLOBIGNORE has on the setting of the `dotglob'
3175 h. The time conversion code now uses CLK_TCK rather than CLOCKS_PER_SEC
3176 on systems without gettimeofday() and resources.
3178 i. The getopt static variables are now initialized each time a subshell
3179 is started, so subshells using `getopts' work right.
3181 j. A sign-extension bug that caused a possible security hole was fixed.
3183 k. The parser now reads characters between backquotes within a double-
3184 quoted string as a single word, so double quotes in the backquoted
3185 string don't terminate the enclosing double-quoted string.
3187 l. A bug that caused `^O' to work incorrectly when typed as the first
3188 thing to an interactive shell was fixed.
3190 m. A rarely-exercised off-by-one error in the code that quotes variable
3193 n. Some memory and file descriptor leaks encountered when running a
3194 shell script that is executable but does not have a leading `#!'
3197 2. Changes to Readline
3199 a. A bug that sometimes caused incorrect results when trying to read
3200 typeahead on systems without FIONREAD was fixed.
3202 3. New Features in Bash
3204 a. The command timing code now uses the value of the TIMEFORMAT variable
3205 to format and display timing statistics.
3207 b. The `time' reserved word now accepts a `-p' option to force the
3208 POSIX.2 output format.
3210 c. There are a couple of new and updated scripts to convert csh startup
3211 files to bash format.
3213 d. There is a new builtin array variable: BASH_VERSINFO. The various
3214 members hold the parts of the version information in BASH_VERSION,
3215 plus the value of MACHTYPE.
3217 4. New Features in Readline
3219 a. Setting LANG to `en_US.ISO8859-1' now causes readline to enter
3222 ------------------------------------------------------------------------------
3223 This document details the changes between this version, bash-2.0-alpha4,
3224 and the previous version, bash-2.0-alpha3.
3228 a. There is better detection of rsh connections on Solaris 2.
3230 b. Assignments to read-only variables preceding a command name are now
3231 variable assignment errors. Variable assignment errors cause
3232 non-interactive shells running in posix mode to exit.
3234 c. The word tokenizer was rewritten to handle nested quotes and pairs
3235 ('', "", ``, ${...}, $(...), $[...], $'...', $"...", <(...), >(...))
3236 correctly. Some of the parameter expansion code was updated as a
3239 d. A fix was made to `test' when given three arguments so that a binary
3240 operator is checked for first, before checking that the first argument
3243 e. 2''>/dev/null is no longer equivalent to 2>/dev/null.
3245 f. Parser error messages were regularized, and in most cases the name of
3246 the shell script being read by a non-interactive shell is not printed
3249 g. A fix was made to the completion code so that it no longer removes the
3250 text the user typed in some cases.
3252 h. The special glibc `getopt' environment variable is no longer put into
3253 the environment on machines with small values of ARG_MAX.
3255 i. The expansion of ${...} now follows the POSIX.2 rules for finding the
3258 j. The shell no longer displays spurious status messages for background
3259 jobs in shell scripts that complete successfully when the script is
3260 run from a terminal.
3262 k. `shopt -o' now correctly updates $SHELLOPTS.
3264 l. A bug that caused the $PATH searching code to return a non-executable
3265 file even when an executable file with the same name appeared later in
3268 m. The shell now does tilde expansions on unquoted `:~' in assignment
3269 statements when not in posix mode.
3271 n. Variable assignment errors when a command consists only of assignments
3272 now cause non-interactive shells to exit when in posix mode.
3274 o. If the variable in a `for' or `select' command is read-only, or not a
3275 legal shell identifier, a variable assignment error occurs.
3277 p. `test' now handles `-a' and `-o' as binary operators when three arguments
3278 are supplied, and correctly parses `( word )' as equivalent to `word'.
3280 q. `test' was fixed so that file names of the form /dev/fd/NN mean the same
3281 thing on all systems, even Linux.
3283 r. Fixed a bug in the globbing code that caused patterns with multiple
3284 consecutive `*'s to not be matched correctly.
3286 s. Fixed a bug that caused $PS2 to not be printed when an interactive shell
3287 not using readline is reading a here document.
3289 t. Fixed a bug that caused history expansion to be performed inappropriately
3290 when a single-quoted string spanned more than one line.
3292 u. `getopts' now checks that the variable name passed by the user as the
3293 second argument is a legal shell identifier and that the variable is
3296 v. Fixed `getopts' to obey POSIX.2 rules for setting $OPTIND when it
3297 encounters an error.
3299 w. Fixed `set' to display variable values in a form that can be re-read.
3301 x. Fixed a bug in the code that keeps track of whether or not local variables
3302 have been declared at the current level of function nesting.
3304 y. Non-interactive shells in posix mode now exit if the name in a function
3305 declaration is not a legal identifier.
3307 z. The job control code now ignores stopped children when the shell is not
3310 aa. The `cd' builtin no longer attempts spelling correction on the directory
3311 name if the shell is not interactive, regardless of the setting of the
3314 bb. Some OS-specific changes were made for SCO 3.2v[45] and AIX 4.2.
3316 cc. `time' now prints its output to stderr, as POSIX.2 specifies.
3318 2. Fixes to Readline
3320 a. After printing possible completions, all lines of a multi-line prompt
3323 b. Some changes were made to the terminal handling code in rltty.c to
3324 work around AIX 4.2 bugs.
3326 3. New Features in Bash
3328 a. There is a new loadable builtin: sprintf, with calling syntax
3329 sprintf var format [args]
3330 This provides an easy way to simulate ksh left- and right-justified
3333 b. The expansions of \h and \H in prompt strings were swapped. \h now
3334 expands to the hostname up to the first `.', as in bash-1.14.
3336 4. New Features in Readline
3338 a. The bash-1.14 behavior when ^M is typed while doing an incremental
3339 search was restored. ^J may now be used to terminate the search without
3342 b. There is a new bindable variable: disable-completion. This inhibits
3343 word completion and causes the completion character to be inserted as
3344 if it had been bound to self-insert.
3346 ------------------------------------------------------------------------------
3347 This document details the changes between this version, bash-2.0-alpha3,
3348 and the previous version, bash-2.0-alpha2.
3350 There is now a file `COMPAT' included in the distribution that lists the
3351 user-visible incompatibilities between 1.14 and 2.0.
3355 a. Some work was done so that word splitting of the rhs of assignment
3356 statements conforms more closely to historical practice.
3358 b. A couple of errant memory frees were fixed.
3360 c. A fix was made to the test builtin so it recognizes `<' and `>' as
3363 d. The GNU malloc in lib/malloc/malloc.c now scrambles memory as it's
3364 allocated and freed. This is to catch callers that refer to freed
3365 memory or assume something about newly-allocated memory.
3367 e. Fixed a problem with conversion to 12-hour time in the prompt
3370 f. Fixed a problem with configure's argument parsing order. Now you can
3371 correctly turn on specific options after using --enable-minimal-config.
3373 g. The configure script now automatically disables the use of GNU malloc
3374 on systems where it's appropriate (better than having people read the
3375 NOTES file and do it manually).
3377 h. There are new prompt expansions (\v and \V) to insert version information
3378 into the prompt strings.
3380 i. The default prompt string now includes the version number.
3382 j. Most of the builtins that take no options were changed to use the
3383 internal getopt so they can produce proper error messages for -?
3384 and incorrect options.
3386 k. Some system-specific changes were made for SVR4.2 and Solaris 2.5.
3388 l. Bash now uses PATH_MAX instead of MAXPATHLEN and NAME_MAX instead of
3391 m. A couple of problems caused by uninitialized variables were fixed.
3393 n. There are a number of new loadable builtin examples: logname, basename,
3394 dirname, tty, pathchk, tee, head, and rmdir. All of these conform to
3397 o. Bash now notices changes in TZ and calls tzset() if present, so
3398 changing TZ will alter the time printed by prompt expansions.
3400 p. The source was reorganized a bit so I don't have to wait so long for
3401 some files to compile, and to facilitate the creation of a `shell
3402 library' at some future point.
3404 q. Bash no longer turns off job control if called as `sh', since the
3405 POSIX.2 spec includes job control as a standard feature.
3407 r. `bash -o posix' now works as intended.
3409 s. Fixed a problem with the completion code: when completing a filename
3410 that contained globbing characters, if show-all-if-ambiguous was set,
3411 the completion code would remove the user's text.
3413 t. Fixed ulimit so that (hopefully) the full range of limits is available
3416 u. A new `shopt' option (`hostcomplete') enables and disables hostname
3419 v. The shell no longer attempts to save the history on an abort(),
3420 which is usually called by programming_error().
3422 w. The `-s' option to `fc' was changed to echo the command to be executed
3423 to stderr instead of stdout.
3425 x. If the editor invoked by `fc -e' exits with a non-zero status, no
3426 commands are executed.
3428 y. Fixed a bug that made the shopt `histverify' option work incorrectly.
3430 z. There is a new variable `MACHTYPE' whose value is the GNU-style
3431 `cpu-company-system' system description as set by configure. (The
3432 values of MACHTYPE and HOSTTYPE should really be swapped.)
3434 aa. The `ulimit' builtin now allows the maximum virtual memory size to be
3435 set via setrlimit(2) if RLIMIT_VMEM is defined.
3437 bb. `bash -nc 'command'' no longer runs `command'.
3439 2. Changes to Readline
3441 a. Fixed a typo in the code that checked for FIONREAD in input.c.
3443 b. Fixed a bug in the code that outputs keybindings, so things like C-\
3444 are quoted properly.
3446 c. Fixed a bug in the inputrc file parsing code to handle the problems
3447 caused by inputrc files created from the output of `bind -p' in
3448 previous versions of bash. The problem was due to the bug fixed
3451 d. Readline no longer turns off the terminal's meta key, and turns it on
3452 once the first time it's called.
3454 ------------------------------------------------------------------------------
3455 This file documents the changes between this version, bash-2.0-alpha2,
3456 and the previous version, bash-2.0-alpha.
3460 a. The shell no longer thinks directories are executable.
3462 b. `disown' has a new option, `h', which inhibits the resending of SIGHUP
3463 but does not remove the job from the jobs table.
3465 c. The varargs functions in error.c now use ANSI-C `stdarg' if available.
3467 d. The build process now treats the `build version' in .build as local to
3468 the build directory, so different versions built from the same source
3469 tree have different `build versions'.
3471 e. Some problems with the grammar have been fixed. (It used `list' in a few
3472 productions where `compound_list' was needed. A `list' must be terminated
3473 with a newline or semicolon; a `compound_list' need not be.)
3475 f. A fix was made to keep `wait' from hanging when waiting for all background
3478 g. `bash --help' now writes its output to stdout, like the GNU Coding Standards
3479 specify, and includes the machine type (the value of MACHTYPE).
3481 h. `bash --version' now prints more information and exits successfully, like
3482 the GNU Coding Standards specify.
3484 i. The output of `time' and `times' now prints fractional seconds with three
3485 places after the decimal point.
3487 j. A bug that caused process substitutions to screw up the pipeline printed
3488 by `jobs' was fixed.
3490 k. Fixes were made to the code that implements $'...' and $"..." so they
3493 l. The process substitution code now opens named pipes for reading with
3494 O_NONBLOCK to avoid hanging.
3496 m. Fixes were made to the trap code so the shell cleans up correctly if the
3497 trap command contains a `return' and we're executing a function or
3498 sourcing a script with `.'.
3500 n. Fixes to doc/Makefile.in so that it doesn't try to remake all of the
3501 documentation (ps, dvi, etc.) on a `make install'.
3503 o. Fixed an auto-increment error that caused bash -c args to sometimes dump
3506 p. Fixed a bug that caused $HISTIGNORE to fail when the history line
3507 contained globbing characters.
3509 2. Changes to Readline
3511 a. There is a new string variable, rl_library_version, available for use by
3512 applications. The current value is "2.1".
3514 b. A bug encountered when expand-tilde was enabled and file completion was
3515 attempted on a word beginning with `~/' was fixed.
3517 c. A slight change was made to the incremental search termination behavior.
3518 ESC still terminates the search, but if input is pending or arrives
3519 within 0.1 seconds (on systems with select(2)), it is used as a prefix
3520 character. This is intented to allow users to terminate searches with
3521 the arrow keys and get the behavior they expect.