1 This document details the changes between this version, bash-2.03-release,
2 and the previous version, bash-2.03-beta2.
6 a. A file descriptor leak in the `fc' builtin was fixed.
8 b. A bug was fixed in the `read' builtin that caused occasional spurious
9 failures when using `read -e'.
11 c. The version code needed to use the value of the cpp variable
12 CONF_MACHTYPE rather than MACHTYPE.
14 d. A new test was added to exercise the command printing and copying code.
16 e. A bug was fixed that caused `time' to be recognized as a reserved word
17 if it was the first pattern in a `case' statement pattern list.
19 ------------------------------------------------------------------------------
20 This document details the changes between this version, bash-2.03-beta2,
21 and the previous version, bash-2.03-beta1.
25 a. Slight additions to support/shobj-conf, mostly for the benefit of AIX 4.2.
27 b. config.{guess,sub} support added for the NEC SX4.
29 c. Changed some of the cross-compiling sections of the configure macros in
30 aclocal.m4 so that configure won't abort.
32 d. Slight changes to how the HTML versions of the bash and readline manuals
35 e. Fixed conditional command printing to avoid interpreting printf `%'-escapes
38 f. Don't include the bash malloc on all variants of the alpha processor.
40 g. Changes to configure to make --enable-profiling work on Solaris 2.x.
42 h. Fixed a bug that manifested itself when shell functions were called
43 between calls to `getopts'.
45 i. Fixed pattern substitution so that a bare `#'as a pattern causes the
46 replacement string to be prefixed to the search string, and a bare
47 `%' causes the replacement string to be appended to the search string.
49 j. Fixed a bug in the command execution code that caused child processes
50 to occasionally have the wrong value for $!.
52 2. Changes to Readline
54 a. Added code to the history library to catch history substitutions using
55 `&' without a previous history substitution or search having been
58 3. New Features in Bash
60 4. New Features in Readline
62 a. New bindable variable: `isearch-terminators'.
64 b. New bindable function: `forward-backward-delete-char' (unbound by default).
66 ------------------------------------------------------------------------------
67 This document details the changes between this version, bash-2.03-beta1,
68 and the previous version, bash-2.03-alpha.
72 a. A change was made to the help text for `{...}' to make it clear that a
73 semicolon is required before the closing brace.
75 b. A fix was made to the `test' builtin so that syntax errors cause test
76 to return an exit status > 1.
78 c. Globbing is no longer performed on assignment statements that appear as
79 arguments to `assignment builtins' such as `export'.
81 d. System-specific configuration changes were made for: Rhapsody,
82 AIX 4.2/gcc, BSD/OS 4.0.
84 e. New loadable builtins: ln, unlink.
86 f. Some fixes were made to the globbing code to handle extended glob patterns
87 which immediately follow a `*'.
89 g. A fix was made to the command printing code to ensure that redirections
90 following compound commands have a space separating them from the rest
93 h. The pathname canonicalization code was changed to produce fewer leading
94 `//' sequences, since those are interpreted as network file system
95 pathnames on some systems.
97 i. A fix was made so that loops containing `eval' commands in commands passed
98 to `bash -c' would not exit prematurely.
100 j. Some changes were made to the job reaping code when the shell is not
101 interactive, so the shell will retain exit statuses longer for examination
104 k. A fix was made so that `jobs | command' works again.
106 l. The erroneous compound array assignment var=((...)) is now a syntax error.
108 m. A change was made to the dynamic loading code in `enable' to support
111 n. A fix was made to the globbing code so that extended globbing patterns
112 will correctly match `.' in a bracket expression.
114 2. Changes to Readline
116 a. A fix was made to the completion code in which a typo caused the wrong
117 value to be passed to the function that computed the longest common
118 prefix of the list of matches.
120 b. The completion code now checks the value of rl_filename_completion_desired,
121 which is set by application-supplied completion functions to indicate
122 that filename completion is being performed, to decide whether or not to
123 call an application-supplied `ignore completions' function.
125 3. New Features in Bash
127 a. A change was made to the startup file code so that any shell begun with
128 the `--login' option, even non-interactive shells, will source the login
131 4. New Features in Readline
133 a. A new variable, rl_erase_empty_line, which, if set by an application using
134 readline, will cause readline to erase, prompt and all, lines on which the
135 only thing typed was a newline.
137 ------------------------------------------------------------------------------
138 This document details the changes between this version, bash-2.03-alpha,
139 and the previous version, bash-2.02.1-release.
143 a. System-specific configuration changes were made for: Irix 6.x, Unixware 7.
145 b. The texi2dvi and texi2html scripts were updated to the latest versions
148 c. The configure tests that determine which native type is 32 bits were
149 changed to not require a compiled program.
151 d. Fixed a bug in shell_execve that could cause memory to be freed twice
154 e. The `printf' test uses `diff -a' if it's available to prevent confusion
155 due to the non-ascii output.
157 f. Shared object configuration is now performed by a shell script,
158 support/shobj-conf, which generates values to be substituted into
159 makefiles by configure.
161 g. Some changes were made to `ulimit' to avoid the use of RLIM_INVALID as a
164 h. Changes were made to `ulimit' to work around HPUX 9.x's peculiar
165 handling of RLIMIT_FILESIZE.
167 i. Some new loadable builtins were added: id, printenv, sync, whoami, push,
168 mkdir. `pushd', `popd', and `dirs' can now be built as regular or
169 loadable builtins from the same source file.
171 j. Changes were made to `printf' to handle NUL bytes in the expanded format
174 k. The various `make clean' Makefile targets now descend into lib/sh.
176 l. The `type' builtin was changed to use the internal `getopt' so that things
177 like `type -ap' work as expected.
179 m. There is a new configuration option, --with-installed-readline, to link
180 bash with a locally-installed version of readline. Only readline version
181 4.0 and later releases can support this. Shared and static libraries
182 are supported. The installed include files are used.
184 n. There is a new autoconf macro used to find which basic type is 64 bits.
186 o. Dynamic linking and loadable builtins should now work on SCO 3.2v5*,
187 AIX 4.2 with gcc, Unixware 7, and many other systems using gcc, where
188 the `-shared' options works correctly.
190 p. A bug was fixed in the bash filename completion code that caused memory to
191 be freed twice if a directory name containing an unset variable was
192 completed and the -u option was set.
194 q. The prompt expansion code now quotes the `$' in the `\$' expansion so it
195 is not processed by subsequent parameter expansion.
197 r. Fixed a parsing bug that caused a single or double quote after a `$$' to
198 trigger ANSI C expansion or locale translation.
200 s. Fixed a bug in the globbing code that caused quoted filenames containing
201 no globbing characters to sometimes be incorrectly expanded.
203 t. Changes to the default prompt strings if prompt string decoding is not
204 compiled into the shell.
206 u. Added `do', `then', `else', `{', and `(' to the list of keywords that may
207 precede the `time' reserved word.
209 v. The shell may now be cross-built for BeOS as well as cygwin32.
211 w. The conditional command execution code now treats `=' the same as `=='
212 for deciding when to perform pattern matching.
214 x. The `-e' option no longer causes the shell to exit if a command exits
215 with a non-zero status while running the startup files.
217 y. The `printf' builtin no longer dumps core if a modifier is supplied in
218 the format string without a conversion character (e.g. `%h').
220 z. Array assignments of the form a=(...) no longer show up in the history
223 aa. The parser was fixed to obey the POSIX.2 rules for finding the closing
224 `}' in a ${...} expression.
226 bb. The history file is now opened with mode 0600 rather than 0666, so bash
227 no longer relies on the user's umask being set appropriately.
229 cc. Setting LANG no longer causes LC_ALL to be assigned a value; bash now
230 relies on proper behavior from the C library.
232 dd. Minor changes were made to allow quoted variable expansions using
233 ${...} to be completed correctly if there is no closing `"'.
235 ee. Changes were made to builtins/Makefile.in so that configuring the shell
236 with `--enable-profiling' works right and builtins/mkbuiltins is
239 2. Changes to Readline
241 a. The version number is now 4.0.
243 b. There is no longer any #ifdef SHELL code in the source files.
245 c. Some changes were made to the key binding code to fix memory leaks and
246 better support Win32 systems.
248 d. Fixed a silly typo in the paren matching code -- it's microseconds, not
251 e. The readline library should be compilable by C++ compilers.
253 f. The readline.h public header file now includes function prototypes for
254 all readline functions, and some changes were made to fix errors in the
255 source files uncovered by the use of prototypes.
257 g. The maximum numeric argument is now clamped at 1000000.
259 h. Fixes to rl_yank_last_arg to make it behave better.
261 i. Fixed a bug in the display code that caused core dumps if the prompt
262 string length exceeded 1024 characters.
264 j. The menu completion code was fixed to properly insert a single completion
265 if there is only one match.
267 k. A bug was fixed that caused the display code to improperly display tabs
270 3. New Features in Bash
272 a. New `shopt' option, `restricted_shell', indicating whether or not the
273 shell was started in restricted mode, for use in startup files.
275 b. Filename generation is now performed on the words between ( and ) in
276 array assignments (which it probably should have done all along).
278 c. OLDPWD is now auto-exported, as POSIX.2 seems to require.
280 d. ENV and BASH_ENV are read-only variables in a restricted shell.
282 4. New Features in Readline
284 a. Many changes to the signal handling:
285 o Readline now catches SIGQUIT and cleans up the tty before returning;
286 o A new variable, rl_catch_signals, is available to application writers
287 to indicate to readline whether or not it should install its own
288 signal handlers for SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP,
289 SIGTTIN, and SIGTTOU;
290 o A new variable, rl_catch_sigwinch, is available to application
291 writers to indicate to readline whether or not it should install its
292 own signal handler for SIGWINCH, which will chain to the calling
293 applications's SIGWINCH handler, if one is installed;
294 o There is a new function, rl_free_line_state, for application signal
295 handlers to call to free up the state associated with the current
296 line after receiving a signal;
297 o There is a new function, rl_cleanup_after_signal, to clean up the
298 display and terminal state after receiving a signal;
299 o There is a new function, rl_reset_after_signal, to reinitialize the
300 terminal and display state after an application signal handler
301 returns and readline continues
303 b. There is a new function, rl_resize_terminal, to reset readline's idea of
304 the screen size after a SIGWINCH.
306 c. New public functions: rl_save_prompt and rl_restore_prompt. These were
307 previously private functions with a `_' prefix.
309 d. New function hook: rl_pre_input_hook, called just before readline starts
310 reading input, after initialization.
312 e. New function hook: rl_display_matches_hook, called when readline would
313 display the list of completion matches. The new function
314 rl_display_match_list is what readline uses internally, and is available
315 for use by application functions called via this hook.
317 f. New bindable function, delete-char-or-list, like tcsh.
319 ------------------------------------------------------------------------------
320 This document details the changes between this version, bash-2.02.1-release,
321 and the previous version, bash-2.02-release.
325 a. A bug that caused the bash readline support to not compile unless aliases
326 and csh-style history were configured into the shell was fixed.
328 b. Fixed a bug that could cause a core dump when here documents contained
329 more than 1000 characters.
331 c. Fixed a bug that caused a CDPATH entry of "" to not be treated the same
332 as the current directory when in POSIX mode.
334 d. Fixed an alignment problem with the memory returned by the bash malloc,
335 so returned memory is now 64-bit aligned.
337 e. Fixed a bug that caused command substitutions executed within pipelines
338 to put the terminal in the wrong process group.
340 f. Fixes to support/config.sub for: alphas, SCO Open Server and Open Desktop,
341 Unixware 2, and Unixware 7.
343 g. Fixes to the pattern matching code to make it work correctly for eight-bit
346 h. Fixed a problem that occasionally caused the shell to display the wrong
347 value for the new working directory when changing to a directory found
348 in $CDPATH when in physical mode.
350 i. Fixed a bug that caused core dumps when using conditional commands in
353 j. Fixed a bug that caused the printf builtin to loop forever if the format
354 string did not consume any of the arguments.
356 k. Fixed a bug in the parameter expansion code that caused "$@" to be
357 incorrectly split if $IFS did not contain a space character.
359 l. Fixed a bug that could cause a core dump when completing hostnames if
360 the number of matching hostnames was an exact multiple of 16.
362 m. Fixed a bug that caused the shell to fork too early when a command
363 such as `%2 &' was given.
365 2. Changes to Readline
367 a. Fixed a problem with redisplay that showed up when the prompt string was
368 longer than the screen width and the prompt contained invisible characters.
370 ------------------------------------------------------------------------------
371 This document details the changes between this version, bash-2.02-release,
372 and the previous version, bash-2.02-beta2.
376 a. A bug was fixed that caused the terminal process group to be set
377 incorrectly when performing command substitution of builtins in a
380 ------------------------------------------------------------------------------
381 This document details the changes between this version, bash-2.02-beta2,
382 and the previous version, bash-2.02-beta1.
386 a. Attempting to `wait' for stopped jobs now generates a warning message.
388 b. Pipelines which exit due to SIGPIPE in non-interactive shells are now
389 not reported if the shell is compiled -DDONT_REPORT_SIGPIPE.
391 c. Some changes were made to builtins/psize.sh and support/bashbug.sh to
392 attempt to avoid some /tmp file races and surreptitious file
395 d. Fixed a bug that caused the shell not to compile if configured with
396 dparen arithmetic but without aliases.
398 e. Fixed a bug that caused the input stream to be switched when assigning
399 empty arrays with `bash -c'.
401 f. A bug was fixed in the readline expansion glue code that caused bash to
402 dump core when expanding lines with an unclosed single quote.
404 g. A fix was made to the `cd' builtin so that using a non-empty directory
405 from $CDPATH results in an absolute pathname of the new current working
406 directory to be displayed after the current directory is changed.
408 h. Fixed a bug in the variable assignment code that caused the shell to
409 dump core when referencing an unset variable with `set -u' enabled in
410 an assignment statement preceding a command.
412 i. Fixed a bug in the exit trap code that caused reserved words to not be
413 recognized under certain circumstances.
415 j. Fixed a bug in the parameter pattern substitution code so that quote
416 removal is performed.
418 k. The shell should now configure correctly on Apple Rhapsody systems.
420 l. The `kill' builtin now prints a usage message if it is not passed any
423 ------------------------------------------------------------------------------
424 This document details the changes between this version, bash-2.02-beta1,
425 and the previous version, bash-2.02-alpha1.
429 a. A few compilation bugs were fixed in the new extended globbing code.
431 b. Executing arithmetic commands now sets the command name to `((' so
432 error messages look right.
434 c. Fixed some build problems with various configuration options.
436 d. The `printf' builtin now aborts immediately if an illegal format
437 character is encountered.
439 e. The code that creates here-documents now behaves better if the file it's
440 trying to create already exists for some reason.
442 f. Fixed a problem with the extended globbing code that made patterns like
443 `x+*' expand incorrectly.
445 g. The prompt string expansion code no longer quotes tildes with backslashes.
447 h. The bash getcwd() implementation in lib/sh/getcwd.c now behaves better in
448 the presence of lstat(2) failures.
450 i. Fixed a bug with strsub() that caused core dumps when executing `fc -s'.
452 j. The mail checking code now ensures that it has a valid default mailpath.
454 k. A bug was fixed that caused local variables to be unset inappropriately
455 when sourcing a script from within another sourced script.
457 l. A bug was fixed in the history saving code so that functions are saved
458 in the history list correctly if `cmdhist' is enabled, but `lithist'
461 m. A bug was fixed that caused printf overflows when displaying error
464 n. It should be easier to build the loadble builtins in examples/loadables,
465 though some manual editing of the generated Makefile is still required.
467 o. The user's primary group is now always ${GROUPS[0]}.
469 p. Some updates were made to support/config.guess from the GNU master copy.
471 q. Some changes were made to the autoconf support for Solaris 2.6 large
474 r. The `command' builtins now does the right thing when confstr(3) cannot
475 find a value for _CS_PATH.
477 s. Extended globbing expressions like `*.!(c)' are not history expanded if
478 `extglob' is enabled.
480 t. Using the `-P' option to `cd' will force the value that is assigned to
481 PWD to not contain any symbolic links.
483 2. Changes to Readline
485 a. The code that prints completion listings now behaves better if one or
486 more of the filenames contains non-printable characters.
488 b. The time delay when showing matching parentheses is now 0.5 seconds.
490 ------------------------------------------------------------------------------
491 This document details the changes between this version, bash-2.02-alpha1,
492 and the previous version, bash-2.01.1-release.
496 a. OS-specific configuration changes for: BSD/OS 3.x, Minix 2.x,
497 Solaris 2.6, SINIX SVR4.
499 b. Changes were made to the generated `info' files so that `install-info'
502 c. PWD is now auto-exported.
504 d. A fix was made to the pipeline code to make sure that the shell forks
505 to execute simple commands consisting solely of assignment statements.
507 e. Changes to the test suite for systems with 14-character filenames.
509 f. The default sizes of some internal hash tables have been made smaller
510 to reduce the shell's memory footprint.
512 g. The `((...))' arithmetic command is now executed directly instead of
513 being translated into `let "..."'.
515 h. Fixes were made to the expansion code so that "$*", "$@", "${array[@]}",
516 and "${array[@]}" expand correctly when IFS does not contain a space
517 character, is unset, or is set to NULL.
519 i. The indirect expansion code (${!var}) was changed so that the only
520 valid values of `var' are variable names, positional parameters, `#',
523 j. An arithmetic expression error in a $((...)) expansion now causes a
524 non-interactive shell running in posix mode to exit.
526 k. Compound array assignment now splits the words within the parentheses
527 on shell metacharacters like the parser would before expansing them
528 and performing the assignment. This is for compatibility with ksh-93.
530 l. The internal shell backslash-quoting code (used in the output of `set'
531 and completion) now quotes tildes if they appear at the start of the
532 string or after a `=' or `:'.
534 m. A couple of bugs with `shopt -o' were fixed.
536 n. `bash +o' now displays the same output as `set +o' before starting an
539 o. A bug that caused command substitution and the `eval' builtin to
540 occasionally free memory twice when an error was encountered was fixed.
542 p. The filename globbing code no longer requires read permission for a
543 directory when the filename to be matched does not contain any globbing
544 characters, as POSIX.2 specifies.
546 q. A bug was fixed so that the job containing the last asynchronous
547 process is not removed from the job table until a `wait' is executed
548 for that process or another asynchronous process is started. This
549 satisfies a POSIX.2 requirement.
551 r. A `select' bug was fixed so that a non-numeric user response is treated
552 the same as a numeric response that is out of range.
554 s. The shell no longer parses the value of SHELLOPTS from the environment
555 if it is restricted, running setuid, or running in `privileged mode'.
557 t. Fixes were made to enable large file support on systems such as
558 Solaris 2.6, where the size of a file may be larger than can be held
561 u. The filename hashing code was fixed to not add `./' to the beginning of
562 filenames which already begin with `./'.
564 v. The configure script was changed so that the GNU termcap library is not
565 compiled in if `prefer-curses' has been specified.
567 w. HISTCONTROL and HISTIGNORE are no longer applied to the second and
568 subsequent lines of a multi-line command.
570 x. A fix was made to `disown' so that it does a better job of catching
573 y. Non-interactive shells no longer report the status of processes terminated
574 due to SIGINT, even if the standard output is a terminal.
576 z. A bug that caused the output of `jobs' to have extra carriage returns
579 aa. A bug that caused PIPESTATUS to not be set when builtins or shell
580 functions were executed in the foreground was fixed.
582 bb. Bash now attempts to detect when it is being run by sshd, and treats
583 that case identically to being run by rshd.
585 cc. A bug that caused `set -a' to export SHELLOPTS when one of the shell
586 options was changed was fixed.
588 dd. The `kill' builtin now disallows empty or missing process id arguments
589 instead of treating them as identical to `0', which means the current
592 ee. `var=value declare -x var' now behaves identically to
593 `var=value export var'. Similarly for `var=value declare -r var' and
594 `var=value readonly var'.
596 ff. A few memory leaks were fixed.
598 gg. `alias' and `unalias' now print error messages when passed an argument
599 that is not an alias for printing or deletion, even when the shell is
600 not interactive, as POSIX.2 specifies.
602 hh. `alias' and `alias -p' now return a status of 0 when no aliases are
603 defined, as POSIX.2 specifes.
605 ii. `cd -' now prints the pathname of the new working directory if the shell
608 jj. A fix was made so that the code that binds $PWD now copes with getcwd()
611 kk. `unset' now checks whether or not a function name it's trying to unset
612 is a valid shell identifier only when the shell is running in posix mode.
614 ll. A change was made to the code that generates filenames for here documents
615 to make them less prone to name collisions.
617 mm. The parser was changed so that `time' is recognized as a reserved word
618 only at the beginning of a pipeline.
620 nn. The pathname canonicalization code was changed so that `//' is converted
621 into `/', but all other pathnames beginning with `//' are left alone, as
624 oo. The `logout' builtin will no longer exit a non-interactive non-login
627 2. Changes to Readline
629 a. Fixed a problem in the readline test program rltest.c that caused a core
632 b. The code that handles parser directives in inputrc files now displays
635 c. The history expansion code was fixed so that the appearance of the
636 history comment character at the beginning of a word inhibits history
637 expansion for that word and the rest of the input line.
639 3. New Features in Bash
641 a. A new version of malloc, based on the older GNU malloc, that has many
642 changes, is more page-based, is more conservative with memory usage,
643 and does not `orphan' large blocks when they are freed.
645 b. A new version of gmalloc, based on the old GLIBC malloc, with many
646 changes and range checking included by default.
648 c. A new implementation of fnmatch(3) that includes full POSIX.2 Basic
649 Regular Expression matching, including character classes, collating
650 symbols, equivalence classes, and support for case-insensitive pattern
653 d. ksh-88 egrep-style extended pattern matching ([@+*?!](patlist)) has been
654 implemented, controlled by a new `shopt' option, `extglob'.
656 e. There is a new ksh-like `[[' compound command, which implements
657 extended `test' functionality.
659 f. There is a new `printf' builtin, implemented according to the POSIX.2
662 g. There is a new feature for command substitution: $(< filename) now expands
663 to the contents of `filename', with any trailing newlines removed
664 (equivalent to $(cat filename)).
666 h. There are new tilde prefixes which expand to directories from the
669 i. There is a new `**' arithmetic operator to do exponentiation.
671 j. There are new configuration options to control how bash is linked:
672 `--enable-profiling', to allow bash to be profiled with gprof, and
673 `--enable-static-link', to allow bash to be linked statically.
675 k. There is a new configuration option, `--enable-cond-command', which
676 controls whether or not the `[[' command is included. It is on by
679 l. There is a new configuration option, `--enable-extended-glob', which
680 controls whether or not the ksh extended globbing feature is included.
681 It is enabled by default.
683 m. There is a new configuration #define in config.h.top that, when enabled,
684 will cause all login shells to source /etc/profile and one of the user-
685 specific login shell startup files, whether or not the shell is
688 n. There is a new invocation option, `--dump-po-strings', to dump
689 a shell script's translatable strings ($"...") in GNU `po' format.
691 o. There is a new `shopt' option, `nocaseglob', to enable case-insensitive
692 pattern matching when globbing filenames and using the `case' construct.
694 p. There is a new `shopt' option, `huponexit', which, when enabled, causes
695 the shell to send SIGHUP to all jobs when an interactive login shell
698 q. `bind' has a new `-u' option, which takes a readline function name as an
699 argument and unbinds all key sequences bound to that function in a
702 r. `disown' now has `-a' and `-r' options, to limit operation to all jobs
703 and running jobs, respectively.
705 s. The `shopt' `-p' option now causes output to be displayed in a reusable
708 t. `test' has a new `-N' option, which returns true if the filename argument
709 has been modified since it was last accessed.
711 u. `umask' now has a `-p' option to print output in a reusable format.
713 v. A new escape sequence, `\xNNN', has been added to the `echo -e' and $'...'
714 translation code. It expands to the character whose ascii code is NNN
717 w. The prompt string expansion code has a new `\r' escape sequence.
719 x. The shell may now be cross-compiled for the CYGWIN32 environment on
722 4. New Features in Readline
724 a. There is now an option for `iterative' yank-last-arg handline, so a user
725 can keep entering `M-.', yanking the last argument of successive history
728 b. New variable, `print-completions-horizontally', which causes completion
729 matches to be displayed across the screen (like `ls -x') rather than up
730 and down the screen (like `ls').
732 c. New variable, `completion-ignore-case', which causes filename completion
733 and matching to be performed case-insensitively.
735 d. There is a new bindable command, `magic-space', which causes history
736 expansion to be performed on the current readline buffer and a space to
737 be inserted into the result.
739 e. There is a new bindable command, `menu-complete', which enables tcsh-like
740 menu completion (successive executions of menu-complete insert a single
741 completion match, cycling through the list of possible completions).
743 f. There is a new bindable command, `paste-from-clipboard', for use on Win32
744 systems, to insert the text from the Win32 clipboard into the editing
747 g. The key sequence translation code now understands printf-style backslash
748 escape sequences, including \NNN octal escapes. These escape sequences
749 may be used in key sequence definitions or macro values.
751 h. An `$include' inputrc file parser directive has been added.
753 ------------------------------------------------------------------------------
754 This document details the changes between this version, bash-2.01.1-release,
755 and the previous version, bash-2.01-release.
759 a. The select command was fixed to check the validity of the user's
760 input more strenuously.
762 b. A bug was fixed that prevented `time' from timing commands correctly
763 when supplied as an argument to `bash -c'.
765 c. A fix was made to the mail checking code to keep from adding the same
766 mail file to the list of files to check multiple times when parsing
769 d. Fixed an off-by-one error in the tilde expansion library.
771 e. When using the compound array assignment syntax, the old value of
772 the array is cleared before assigning the new value.
774 f. Fixed a bug that could cause a core dump when a trap handler was reset
775 to the default in the trap command associated with that signal.
777 g. Fixed a bug in the locale code that occurred when assigning a value
780 h. A change was made to the parser so that words of the form xxx=(...)
781 are not considered compound assignment statements unless there are
782 characters before the `='.
784 i. A fix was made to the command tracing code to correctly quote each
787 j. Some changes were made to the bash-specific autoconf tests to make them
790 k. Completion of words with globbing characters now correctly quotes the
793 l. The directory /var/spool/mail is now preferred to /usr/spool/mail when
794 configure is deciding on the default mail directory.
796 m. The brace completion code was fixed to not quote the `{' and `}'.
798 n. Some fixes were made to make $RANDOM more random in subshells.
800 o. System-specific changes were made to configure for: SVR4.2
802 p. Changes were made so that completion of words containing globbing chars
803 substitutes the result only if a single filename was matched.
805 q. The window size is now recomputed after a job is stopped with SIGTSTP if
806 the user has set `checkwinsize' with `shopt'.
808 r. When doing substring expansion, out-of-range substring specifiers now
809 cause nothing to be substituted rather than an expansion error.
811 s. A fix was made so that you can no longer trap `SIGEXIT' or `SIGDEBUG' --
812 only `EXIT' and `DEBUG' are accepted.
814 t. The display of trapped signals now uses the signal number if signals
815 for which bash does not know the name are trapped.
817 u. A fix was made so that `bash -r' does not turn on restricted mode until
818 after the startup files are executed.
820 v. A bug was fixed that occasionally caused a core dump when a variable
821 found in the temporary environment of export/declare/readonly had a
824 w. A bug that occasionally caused unallocated memory to be passed to free()
825 when doing arithmetic substitution was fixed.
827 x. A bug that caused a buffer overrun when expanding a prompt string
828 containing `\w' and ${#PWD} exceeded PATH_MAX was fixed.
830 y. A problem with the completion code that occasionally caused it to
831 refer to a character before the beginning of the readline line buffer
834 z. A bug was fixed so that the `read' builtin restarts reads when
835 interrupted by signals other than SIGINT.
837 aa. Fixed a bug that caused a command to be freed twice when there was
838 an evaluation error in the `eval' command.
840 2. Changes to Readline
842 a. Added a missing `extern' to a declaration in readline.h that kept
843 readline from compiling cleanly on some systems.
845 b. The history file is now opened with mode 0600 when it is written for
848 c. Changes were made to the SIGWINCH handling code so that prompt redisplay
851 d. ^G now interrupts incremental searches correctly.
853 e. A bug that caused a core dump when the set of characters to be quoted
854 when completing words was empty was fixed.
856 ------------------------------------------------------------------------------
857 This document details the changes between this version, bash-2.01-release,
858 and the previous version, bash-2.01-beta2.
862 a. The `distclean' target should remove the `printenv' executable if it
865 b. The test suite was changed slightly to ensure that the error messages
866 are printed in English.
868 c. A bug that caused the shell to dump core when a filename containing a
869 `/' was passed to `hash' was fixed.
871 d. Pathname canonicalization now leaves a leading `//' intact, as POSIX.1
874 e. A memory leak when completing commands was fixed.
876 f. A memory leak that occurred when checking the hash table for commands
877 with relative paths was fixed.
879 ------------------------------------------------------------------------------
880 This document details the changes between this version, bash-2.01-beta2,
881 and the previous version, bash-2.01-beta1.
885 a. The `ulimit' builtin translates RLIM_INFINITY to the hard limit only if
886 the current (soft) limit is less than or equal to the hard limit.
888 b. Fixed a bug that caused the bash emulation of strcasecmp to produce
891 c. A bug that caused memory to be freed twice when a trap handler resets
892 the trap more than once was fixed.
894 d. A bug that caused machines where sizeof (pointer) > sizeof (int) to
895 fail (and possibly dump core) when trying to unwind-protect a null
898 e. The startup files should not be run with job control enabled. This fix
899 allows SIGINT to once again interrupt startup file execution.
901 f. Bash should not change the SIGPROF handler if it is set to something
904 g. The completion code that provides bash-specific completions for readline
905 now quotes characters that the readline code would treat as word break
906 characters if they appear in a file name.
908 h. The completion code now correctly quotes filenames containing a `!',
909 even if the user attempted to use double quotes when attempting
912 i. A bug that caused the shell to dump core when `disown' was called without
913 arguments and there was no current job was fixed.
915 j. A construct like $((foo);bar) is now processed as a command substitution
916 rather than as a bad arithmetic substitution.
918 k. A couple of bugs that caused `fc' to not obey the `cmdhist' and `lithist'
919 shell options when editing and re-executing a series of commands were
922 l. A fix was made to the grammar -- the list of commands between `do' and
923 `done' in the body of a `for' command should be treated the same as a
926 2. Changes to Readline
928 a. A couple of bugs that caused the history search functions to attempt to
929 free a NULL pointer were fixed.
931 b. If the C library provides setlocale(3), readline does not need to look
932 at various environment variables to decide whether or not to go into
933 eight-bit mode automatically -- just check whether the current locale
934 is not `C' or `POSIX'.
936 c. If the filename completion function finds that a directory was not closed
937 by a previous (interrupted) completion, it closes the directory with
940 3. New Features in Bash
942 a. New bindable readline commands: history-and-alias-expand-line and
943 alias-expand-line. The code was always in there, there was just no
946 ------------------------------------------------------------------------------
947 This document details the changes between this version, bash-2.01-beta1,
948 and the previous version, bash-2.01-alpha1.
952 a. Fixed a problem that could cause file descriptors used for process
953 substitution to conflict with those used explicitly in redirections.
955 b. Made it easier to regenerate configure if the user changes configure.in.
957 c. ${GROUPS[0]} should always be the primary group, even on systems without
960 d. Spelling correction is no longer enabled by default.
962 e. Fixes to quoting problems in `bashbug'.
964 f. OS-specific configuration changes were made for: Irix 6.
966 g. OS-specific code changes were made for: QNX.
968 h. A more meaningful message is now printed when the file in /tmp for a
969 here document cannot be created.
971 i. Many changes to the shell's variable initialization code to speed
972 non-interactive startup.
974 j. Changes to the non-job-control code so that it does not try to open
977 k. The output of `set' and `export' is once again sorted, as POSIX wants.
979 l. Fixed a problem caused by a recursive call reparsing the value of
982 m. The tilde code no longer calls getenv() when it's compiled as part of
983 the shell, which should eliminate problems on systems that cannot
984 redefine getenv(), like the NeXT OS.
986 n. Fixed a problem that caused `bash -o' or `bash +o' to not list all
989 o. Fixed `ulimit' to convert RLIM_INFINITY to the appropriate hard limit
990 only if the hard limit is greater than the current (soft) limit.
992 p. Fixed a problem that arose when building bash in a different directory
993 than the source and y.tab.[ch] were remade with something other than
994 bison. This came up most often on NetBSD.
996 q. Fixed a problem with completion -- it thought that `pwd`/[TAB] indicated
997 an unfinished command completion (`/), which generated errors.
999 r. The bash special tilde expansions (~-, ~+) are now attempted before
1000 calling the standard tilde expansion code, which should eliminate the
1001 problems people have been seeing with this on Solaris 2.5.1.
1003 s. Added support for <stdarg.h> to places where it was missing.
1005 t. Changed the code that reads the output of a command substitution to not
1006 go through stdio. This reduces the memory requirements and is faster.
1008 u. A number of changes to speed up export environment creation were made.
1010 v. A number of memory leaks were fixed as the result of running the test
1011 scripts through Purify.
1013 w. Fixed a bug that caused subshells forked to interpret executable
1014 scripts without a leading `#!' to not reinitialize the values of
1017 2. Changes to Readline
1019 a. History library has less `#ifdef SHELL' code -- abstracted stuff out
1020 into application-specific function hooks.
1022 b. Readline no longer calls getenv() if it's compiled as part of the shell,
1023 which should eliminate problems on systems that cannot redefine getenv(),
1026 c. Fixed translation of ESC when `untranslating' macro values.
1028 d. The region kill operation now fixes the mark if it ends up beyond the
1029 boundaries of the line after the region is deleted.
1031 3. New Features in Bash
1033 a. New argument for `configure': `--with-curses'. This can be used to
1034 override the selection of the termcap library on systems where it is
1037 ------------------------------------------------------------------------------
1038 This document details the changes between this version, bash-2.01-alpha1,
1039 and the previous version, bash-2.0-release.
1043 a. System-specific configuration changes for: FreeBSD, SunOS4, Irix,
1044 MachTen, QNX 4.2, Harris Night Hawk, SunOS5.
1046 b. System-specific code changes were made for: Linux, 4.4 BSD, QNX 4.2,
1049 c. A bug that caused the exec builtin to fail because the full pathname of
1050 the command could not be found was fixed.
1052 d. The code that performs output redirections is now more resistant to
1053 race conditions and possible security exploits.
1055 e. A bug that caused the shell to dump core when performing pattern
1056 substitutions on variable values was fixed.
1058 f. More hosts are now recognized by the auto-configuration mechanism
1059 (OpenBSD, QNX, others).
1061 g. Assignments to read-only variables that attempt to convert them to
1062 arrays are now errors.
1064 h. A bug that caused shell scripts using array assignments in POSIX mode
1065 to exit after the assignment was performed was fixed.
1067 i. The substring expansion code is now more careful about running off the
1068 ends of the expanded variable value.
1070 j. A bug that caused completion to fail if a backquoted command substitution
1071 appeared anywhere on the line was fixed.
1073 k. The `source' builtin no longer turns off history if it has been enabled
1074 in a non-interactive shell.
1076 l. A bug that caused the shell to crash when `disown' was given a pid
1077 instead of a job number was fixed.
1079 m. The `cd' spelling correction code will not try to change to `.' if no
1080 directory entries match a single-character argument.
1082 n. A bad variable name supplied to `declare', `export', or `readonly' no
1083 longer causes a non-interactive shell in POSIX mode to exit.
1085 o. Some fixes were made to the test suite to handle peculiarities of
1086 various Unix versions.
1088 p. The bash completion code now quotes characters that readline would
1089 treat as word breaks for completion but are not shell metacharacters.
1091 q. Bad options supplied at invocation now cause a usage message to be
1094 r. Fixes were made to the code that handles DEBUG traps so that the trap
1095 string is not freed inappropriately.
1097 s. Some changes were made to the bash debugger in examples/bashdb -- it
1098 should be closer to working now.
1100 t. A problem that caused the default filename used for mail checking to be
1103 u. A fix was made to the `echo' builtin so that NUL characters printed with
1104 `echo -e' do not cause the output to be truncated.
1106 v. A fix was made to the job control code so that the shell behaves better
1107 when monitor mode is enabled in a non-interactive shell.
1109 w. Bash no longer catches all of the terminating signals in a non-
1110 interactive shell until a trap is set on EXIT, which should result in
1113 x. A fix was made to the command timing code so that `time' can be used in
1116 y. A fix was made to the parser so that `((cmd); cmd2)' is now parsed as
1117 a nested subshell rather than strictly as an (erroneous) arithmetic
1120 z. A fix was made to the globbing code so that it correctly matches quoted
1121 filenames beginning with a `.'.
1123 aa. A bug in `fc' that caused some multi-line commands to not be stored as
1124 one command in the history when they were re-executed after editing
1125 (with `fc -e') was fixed.
1127 bb. The `ulimit' builtin now attempts to catch some classes of integer
1130 cc. The command-oriented-history code no longer attempts to add `;'
1131 inappropriately when a newline appears while reading a $(...) command
1134 dd. A bug that caused the shell to dump core when `help --' was executed
1137 ee. A bug that caused the shell to crash when an unset variable appeared
1138 in the body of a here document after `set -u' had been executed was
1141 ff. Implicit input redirections from /dev/null for asynchronous commands
1142 are now handled better.
1144 gg. A bug that caused the shell to fail to compile when configured with
1145 `--disable-readline' was fixed.
1147 hh. The globbing code should now be interruptible.
1149 ii. Bash now notices when the `kill' builtin is used to send SIGCONT to a
1150 stopped job and adjusts the data structures accordingly, as if `bg' had
1151 been executed instead.
1153 jj. A bug that caused the shell to crash when mixing calls to `getopts'
1154 and `shift' on the same set of positional parameters was fixed.
1156 kk. The command printing code now preserves the `-p' flag to `time'.
1158 ll. The command printing code now handles here documents better when there
1159 are other redirections associated with the command.
1161 mm. The special glibc environment variable (NNN_GNU_nonoption_argv_flags_)
1162 is no longer placed into the environment of executed commands -- users
1163 of glibc had too many problems with it.
1165 nn. Reorganized the code that generates signames.h. The signal_names list
1166 is now more complete but may be slightly different (SIGABRT is favored
1167 over SIGIOT, for example). The preferred signal names are those
1168 listed in the POSIX.2 standard.
1170 oo. `bashbug' now uses a filename shorter than 14 characters for its
1171 temporary file, and asks for confirmation before sending the bug
1174 pp. A bug that caused TAB completion in vi editing mode to not be turned
1175 off when `set -o posix' was executed or back on when `set +o posix'
1176 was executed was fixed.
1178 qq. A bug in the brace expansion code that caused brace expansions appearing
1179 in new-style $(...) command substitutions to be inappropriately expanded
1182 rr. A bug in the readline hook shell-expand-line that could cause memory to
1183 be inappropriately freed was fixed.
1185 ss. A bug that caused some arithmetic expressions containing `&&' and `||'
1186 to be parsed with the wrong precedence has been fixed.
1188 tt. References to unbound variables after `set -u' has been executed now
1189 cause the shell to exit immediately, as they should.
1191 uu. A bug that caused the shell to exit inappropriately when `set -e' had
1192 been executed and a command's return status was being inverted with the
1193 `!' reserved word was fixed.
1195 vv. A bug that could occasionally cause the shell to crash with a
1196 divide-by-zero error when timing a command was fixed.
1198 ww. A bug that caused parameter pattern substitution to leave stray
1199 backslashes in the replacement string when the expression is in
1200 double quotes was fixed.
1202 xx. The `break' and `continue' builtins now break out of all loops when an
1203 invalid count argument is supplied.
1205 yy. Fixed a bug that caused PATH to be set to the empty string if
1206 `command -p' is executed with PATH unset.
1208 zz. Fixed `kill -l signum' to print the signal name without the `SIG' prefix,
1211 aaa. Fixed a bug that caused the shell to crash while setting $SHELLOPTS
1212 if there were no shell options set.
1214 bbb. Fixed `export -p' and `readonly -p' so that when the shell is in POSIX
1215 mode, their output is as POSIX.2 specifies.
1217 ccc. Fixed a bug in `readonly' so that `readonly -a avar=(...)' actually
1218 creates an array variable.
1220 ddd. Fixed a bug that prevented `time' from correctly timing background
1223 2. Changes to Readline
1225 a. A bug that caused an extra newline to be printed when the cursor was on
1226 an otherwise empty line was fixed.
1228 b. An instance of memory being used after it was freed was corrected.
1230 c. The redisplay code now works when the prompt is longer than the screen
1233 d. `dump-macros' is now a bindable name, as it should have been all along.
1235 e. Non-printable characters are now expanded when displaying macros and
1238 f. The `dump-variables' and `dump-macros' commands now output a leading
1239 newline if they're called as the result of a key sequence, rather
1240 than directly by an application.
1242 3. New Features in Bash
1244 a. There is a new builtin array variable: GROUPS, the set of groups to which
1245 the user belongs. This is used by the test suite.
1247 4. New Features in Readline
1249 a. If a key sequence bound to `universal-argument' is read while reading a
1250 numeric argument started with `universal-argument', it terminates the
1251 argument but is otherwise ignored. This provides a way to insert multiple
1252 instances of a digit string, and is how GNU emacs does it.
1254 ------------------------------------------------------------------------------
1255 This document details the changes between this version, bash-2.0-release,
1256 and the previous version, bash-2.0-beta3.
1260 a. Fix to the `getopts' builtin so that it does the right thing when a
1261 required option argument is not present.
1263 b. The completion code now updates the common prefix of matched names
1264 after FIGNORE processing is done, since any names that were removed
1265 may have changed the common prefix.
1267 c. Fixed a bug that made messages in MAILPATH entries not work correctly.
1269 d. Fixed a serious documentation error in the description of the new
1270 ${parameter:offset[:length]} expansion.
1272 e. Fixes to make parameter substring expansion ({$param:offset[:length]})
1273 work when within double quotes.
1275 f. Fixes to make ^A (CTLESC) survive an unquoted expansion of positional
1278 g. Corrected a misspelling of `unlimited' in the output of `ulimit'.
1280 h. Fixed a bug that caused executable scripts without a leading `#!' to
1281 occasionally pick up the wrong set of positional parameters.
1283 i. Linux systems now have a working `ulimit -v', using RLIMIT_AS.
1285 j. Updated config.guess so that many more machine types are recognized.
1287 k. Fixed a bug with backslash-quoted slashes in the ${param/pat[/sub]}
1290 l. If the shell is named `-su', and `-c command' is supplied, read and
1291 execute the login shell startup files even though the shell is not
1292 interactive. This is to support the `-' option to `su'.
1294 m. Fixed a bug that caused core dumps when the DEBUG trap was ignored
1295 with `trap "" DEBUG' and a shell function was subsequently executed.
1297 n. Fixed a bug that caused core dumps in the read builtin when IFS was
1298 set to the null string and the input had leading whitespace.
1300 2. Changes to Readline
1302 a. Fixed a bug that caused a numeric argument of 1024 to be ignored when
1305 b. Fixed the display code so that the numeric argument is displayed as it's
1308 c. Fixed the numeric argument reading code so that `M-- command' is
1309 equivalent to `M--1 command', as the prompt implies.
1311 3. New Features in Bash
1313 a. `ulimit' now sets both hard and soft limits and reports the soft limit
1314 by default (when neither -H nor -S is specified). This is compatible
1315 with versions of sh and ksh that implement `ulimit'.
1317 b. Integer constants have been extended to base 64.
1319 4. New Features in Readline
1321 a. The `home' and `end' keys are now bound to beginning-of-line and
1322 end-of-line, respectively, if the corresponding termcap capabilities
1325 ------------------------------------------------------------------------------
1326 This document details the changes between this version, bash-2.0-beta3,
1327 and the previous version, bash-2.0-beta2.
1331 a. System-specific changes for: AIX 4.2, SCO 3.2v[45], HP-UX.
1333 b. When in POSIX mode, variable assignments preceding a special builtin
1334 persist in the shell environment after the builtin completes.
1336 c. Changed all calls to getwd() to getcwd(). Improved check for systems
1337 where the libc getcwd() calls popen(), since that breaks on some
1338 systems when job control is being used.
1340 d. Fixed a bug that caused seg faults when executing scripts with the
1341 execute bit set but without a leading `#!'.
1343 e. The environment passed to executed commands is never sorted.
1345 f. A bug was fixed in the code that expands ${name[@]} to the number of
1346 elements in an array variable.
1348 g. A bug was fixed in the array compound assignment code ( A=( ... ) ).
1350 h. Window size changes now correctly propagate down to readline if
1351 the shopt `checkwinsize' option is enabled.
1353 i. A fix was made in the code that expands to the length of a variable
1356 j. A fix was made to the command builtin so that it did not turn on the
1357 `no fork' flag inappropriately.
1359 k. A fix was made to make `set -n' work more reliably.
1361 l. A fix was made to the job control initialization code so that the
1362 terminal process group is set to the shell's process group if the
1363 shell changes its own process group.
1365 2. Changes to Readline
1367 a. System-specific changes for: SCO 3.2v[45].
1369 b. The behavior of the vi-mode `.' when redoing an `i' command was changed
1370 to insert the text previously inserted by the `i' command rather than
1371 simply entering insert mode.
1373 3. New features in Bash
1375 a. There is a new version of the autoload function package, in
1376 examples/functions/autoload.v2, that uses arrays and provides more
1379 b. Support for LC_COLLATE and locale-specific sorting of the results of
1380 pathname expansion if strcoll() is available.
1382 4. New Features in Readline
1384 a. Support for locale-specific sorting of completion possibilities if
1385 strcoll() is available.
1387 ------------------------------------------------------------------------------
1388 This document details the changes between this version, bash-2.0-beta2,
1389 and the previous version, bash-2.0-beta1.
1393 a. `pushd -' is once again equivalent to `pushd $OLDPWD'.
1395 b. OS-specific changes for: SCO 3.2v[45].
1397 c. A change was made to the fix for the recently-reported security hole
1398 when reading characters with octal value 255 to make it work better on
1399 systems with restartable system calls when not using readline.
1401 d. Some changes were made to the test suite so that it works if you
1402 configure bash with --enable-usg-echo-default.
1404 e. A fix was made to the parsing of conditional arithmetic expressions.
1406 f. Illegal arithmetic bases now cause an arithmetic evaluation error rather
1407 than being silently reset.
1409 g. Multiple arithmetic bases now cause an arithmetic evaluation error
1410 instead of being ignored.
1412 h. A fix was made to the evaluation of ${param?word} to conform to POSIX.2.
1414 i. A bug that sometimes caused array indices to be evaluated twice (which
1415 would cause errors when they contained assignment statements) was fixed.
1417 j. `ulimit' was rewritten to avoid problems with getrlimit(2) returning
1418 unsigned values and to simplify the code.
1420 k. A bug in the command-oriented-history code that caused it to sometimes
1421 put semicolons after right parens inappropriately was fixed.
1423 l. The values inserted into the prompt by the \w and \W escape sequences
1424 are now quoted to prevent further expansion.
1426 m. An interactive shell invoked as `sh' now reads and executes commands
1427 from the file named by $ENV when it starts up. If it's a login shell,
1428 it does this after reading /etc/profile and ~/.profile.
1430 n. The file named by $ENV is never read by non-interactive shells.
1432 2. Changes to Readline
1434 a. A few changes were made to hide some macros and functions that should not
1437 b. An off-by-one error that caused seg faults in the history expansion code
1440 3. New Features in Bash
1442 a. The ksh-style ((...)) arithmetic command was implemented. It is exactly
1443 identical to let "...". This is controlled by a new option to configure,
1444 `--enable-dparen-arithmetic', which is on by default.
1446 b. There is a new #define available in config.h.top: SYS_BASH_LOGOUT. If
1447 defined to a filename, bash reads and executes commands from that file
1448 when a login shell exits. It's commented out by default.
1450 c. `ulimit' has a `-l' option that reports the maximum amount of data that
1451 may be locked into memory on 4.4BSD-based systems.
1453 ------------------------------------------------------------------------------
1454 This document details the changes between this version, bash-2.0-beta1,
1455 and the previous version, bash-2.0-alpha4.
1459 a. A bug that sometimes caused traps to be ignored on signals the
1460 shell treats specially was fixed.
1462 b. The internationalization code was changed to track the values of
1463 LC_* variables and call setlocale() as appropriate. The TEXTDOMAIN
1464 and TEXTDOMAINDIR variables are also tracked; changes cause calls
1465 to textdomain() and bindtextdomain(), if available.
1467 c. A bug was fixed that sometimes caused double-quoted strings to be
1470 d. Changes were made so that the siglist code compiles correctly on
1473 e. Added `:' to the set of characters that cause word breaks for the
1474 completion code so that pathnames in assignments to $PATH can be
1477 f. The `select' command was fixed to print $PS3 to stderr.
1479 g. Fixed an error in the manual page section describing the effect that
1480 setting and unsetting GLOBIGNORE has on the setting of the `dotglob'
1483 h. The time conversion code now uses CLK_TCK rather than CLOCKS_PER_SEC
1484 on systems without gettimeofday() and resources.
1486 i. The getopt static variables are now initialized each time a subshell
1487 is started, so subshells using `getopts' work right.
1489 j. A sign-extension bug that caused a possible security hole was fixed.
1491 k. The parser now reads characters between backquotes within a double-
1492 quoted string as a single word, so double quotes in the backquoted
1493 string don't terminate the enclosing double-quoted string.
1495 l. A bug that caused `^O' to work incorrectly when typed as the first
1496 thing to an interactive shell was fixed.
1498 m. A rarely-exercised off-by-one error in the code that quotes variable
1501 n. Some memory and file descriptor leaks encountered when running a
1502 shell script that is executable but does not have a leading `#!'
1505 2. Changes to Readline
1507 a. A bug that sometimes caused incorrect results when trying to read
1508 typeahead on systems without FIONREAD was fixed.
1510 3. New Features in Bash
1512 a. The command timing code now uses the value of the TIMEFORMAT variable
1513 to format and display timing statistics.
1515 b. The `time' reserved word now accepts a `-p' option to force the
1516 POSIX.2 output format.
1518 c. There are a couple of new and updated scripts to convert csh startup
1519 files to bash format.
1521 d. There is a new builtin array variable: BASH_VERSINFO. The various
1522 members hold the parts of the version information in BASH_VERSION,
1523 plus the value of MACHTYPE.
1525 4. New Features in Readline
1527 a. Setting LANG to `en_US.ISO8859-1' now causes readline to enter
1530 ------------------------------------------------------------------------------
1531 This document details the changes between this version, bash-2.0-alpha4,
1532 and the previous version, bash-2.0-alpha3.
1536 a. There is better detection of rsh connections on Solaris 2.
1538 b. Assignments to read-only variables preceding a command name are now
1539 variable assignment errors. Variable assignment errors cause
1540 non-interactive shells running in posix mode to exit.
1542 c. The word tokenizer was rewritten to handle nested quotes and pairs
1543 ('', "", ``, ${...}, $(...), $[...], $'...', $"...", <(...), >(...))
1544 correctly. Some of the parameter expansion code was updated as a
1547 d. A fix was made to `test' when given three arguments so that a binary
1548 operator is checked for first, before checking that the first argument
1551 e. 2''>/dev/null is no longer equivalent to 2>/dev/null.
1553 f. Parser error messages were regularized, and in most cases the name of
1554 the shell script being read by a non-interactive shell is not printed
1557 g. A fix was made to the completion code so that it no longer removes the
1558 text the user typed in some cases.
1560 h. The special glibc `getopt' environment variable is no longer put into
1561 the environment on machines with small values of ARG_MAX.
1563 i. The expansion of ${...} now follows the POSIX.2 rules for finding the
1566 j. The shell no longer displays spurious status messages for background
1567 jobs in shell scripts that complete successfully when the script is
1568 run from a terminal.
1570 k. `shopt -o' now correctly updates $SHELLOPTS.
1572 l. A bug that caused the $PATH searching code to return a non-executable
1573 file even when an executable file with the same name appeared later in
1576 m. The shell now does tilde expansions on unquoted `:~' in assignment
1577 statements when not in posix mode.
1579 n. Variable assignment errors when a command consists only of assignments
1580 now cause non-interactive shells to exit when in posix mode.
1582 o. If the variable in a `for' or `select' command is read-only, or not a
1583 legal shell identifier, a variable assignment error occurs.
1585 p. `test' now handles `-a' and `-o' as binary operators when three arguments
1586 are supplied, and correctly parses `( word )' as equivalent to `word'.
1588 q. `test' was fixed so that file names of the form /dev/fd/NN mean the same
1589 thing on all systems, even Linux.
1591 r. Fixed a bug in the globbing code that caused patterns with multiple
1592 consecutive `*'s to not be matched correctly.
1594 s. Fixed a bug that caused $PS2 to not be printed when an interactive shell
1595 not using readline is reading a here document.
1597 t. Fixed a bug that caused history expansion to be performed inappropriately
1598 when a single-quoted string spanned more than one line.
1600 u. `getopts' now checks that the variable name passed by the user as the
1601 second argument is a legal shell identifier and that the variable is
1604 v. Fixed `getopts' to obey POSIX.2 rules for setting $OPTIND when it
1605 encounters an error.
1607 w. Fixed `set' to display variable values in a form that can be re-read.
1609 x. Fixed a bug in the code that keeps track of whether or not local variables
1610 have been declared at the current level of function nesting.
1612 y. Non-interactive shells in posix mode now exit if the name in a function
1613 declaration is not a legal identifier.
1615 z. The job control code now ignores stopped children when the shell is not
1618 aa. The `cd' builtin no longer attempts spelling correction on the directory
1619 name if the shell is not interactive, regardless of the setting of the
1622 bb. Some OS-specific changes were made for SCO 3.2v[45] and AIX 4.2.
1624 cc. `time' now prints its output to stderr, as POSIX.2 specifies.
1626 2. Fixes to Readline
1628 a. After printing possible completions, all lines of a multi-line prompt
1631 b. Some changes were made to the terminal handling code in rltty.c to
1632 work around AIX 4.2 bugs.
1634 3. New Features in Bash
1636 a. There is a new loadable builtin: sprintf, with calling syntax
1637 sprintf var format [args]
1638 This provides an easy way to simulate ksh left- and right-justified
1641 b. The expansions of \h and \H in prompt strings were swapped. \h now
1642 expands to the hostname up to the first `.', as in bash-1.14.
1644 4. New Features in Readline
1646 a. The bash-1.14 behavior when ^M is typed while doing an incremental
1647 search was restored. ^J may now be used to terminate the search without
1650 b. There is a new bindable variable: disable-completion. This inhibits
1651 word completion and causes the completion character to be inserted as
1652 if it had been bound to self-insert.
1654 ------------------------------------------------------------------------------
1655 This document details the changes between this version, bash-2.0-alpha3,
1656 and the previous version, bash-2.0-alpha2.
1658 There is now a file `COMPAT' included in the distribution that lists the
1659 user-visible incompatibilities between 1.14 and 2.0.
1663 a. Some work was done so that word splitting of the rhs of assignment
1664 statements conforms more closely to historical practice.
1666 b. A couple of errant memory frees were fixed.
1668 c. A fix was made to the test builtin so it recognizes `<' and `>' as
1671 d. The GNU malloc in lib/malloc/malloc.c now scrambles memory as it's
1672 allocated and freed. This is to catch callers that refer to freed
1673 memory or assume something about newly-allocated memory.
1675 e. Fixed a problem with conversion to 12-hour time in the prompt
1678 f. Fixed a problem with configure's argument parsing order. Now you can
1679 correctly turn on specific options after using --enable-minimal-config.
1681 g. The configure script now automatically disables the use of GNU malloc
1682 on systems where it's appropriate (better than having people read the
1683 NOTES file and do it manually).
1685 h. There are new prompt expansions (\v and \V) to insert version information
1686 into the prompt strings.
1688 i. The default prompt string now includes the version number.
1690 j. Most of the builtins that take no options were changed to use the
1691 internal getopt so they can produce proper error messages for -?
1692 and incorrect options.
1694 k. Some system-specific changes were made for SVR4.2 and Solaris 2.5.
1696 l. Bash now uses PATH_MAX instead of MAXPATHLEN and NAME_MAX instead of
1699 m. A couple of problems caused by uninitialized variables were fixed.
1701 n. There are a number of new loadable builtin examples: logname, basename,
1702 dirname, tty, pathchk, tee, head, and rmdir. All of these conform to
1705 o. Bash now notices changes in TZ and calls tzset() if present, so
1706 changing TZ will alter the time printed by prompt expansions.
1708 p. The source was reorganized a bit so I don't have to wait so long for
1709 some files to compile, and to facilitate the creation of a `shell
1710 library' at some future point.
1712 q. Bash no longer turns off job control if called as `sh', since the
1713 POSIX.2 spec includes job control as a standard feature.
1715 r. `bash -o posix' now works as intended.
1717 s. Fixed a problem with the completion code: when completing a filename
1718 that contained globbing characters, if show-all-if-ambiguous was set,
1719 the completion code would remove the user's text.
1721 t. Fixed ulimit so that (hopefully) the full range of limits is available
1724 u. A new `shopt' option (`hostcomplete') enables and disables hostname
1727 v. The shell no longer attempts to save the history on an abort(),
1728 which is usually called by programming_error().
1730 w. The `-s' option to `fc' was changed to echo the command to be executed
1731 to stderr instead of stdout.
1733 x. If the editor invoked by `fc -e' exits with a non-zero status, no
1734 commands are executed.
1736 y. Fixed a bug that made the shopt `histverify' option work incorrectly.
1738 z. There is a new variable `MACHTYPE' whose value is the GNU-style
1739 `cpu-company-system' system description as set by configure. (The
1740 values of MACHTYPE and HOSTTYPE should really be swapped.)
1742 aa. The `ulimit' builtin now allows the maximum virtual memory size to be
1743 set via setrlimit(2) if RLIMIT_VMEM is defined.
1745 bb. `bash -nc 'command'' no longer runs `command'.
1747 2. Changes to Readline
1749 a. Fixed a typo in the code that checked for FIONREAD in input.c.
1751 b. Fixed a bug in the code that outputs keybindings, so things like C-\
1752 are quoted properly.
1754 c. Fixed a bug in the inputrc file parsing code to handle the problems
1755 caused by inputrc files created from the output of `bind -p' in
1756 previous versions of bash. The problem was due to the bug fixed
1759 d. Readline no longer turns off the terminal's meta key, and turns it on
1760 once the first time it's called.
1762 ------------------------------------------------------------------------------
1763 This file documents the changes between this version, bash-2.0-alpha2,
1764 and the previous version, bash-2.0-alpha.
1768 a. The shell no longer thinks directories are executable.
1770 b. `disown' has a new option, `h', which inhibits the resending of SIGHUP
1771 but does not remove the job from the jobs table.
1773 c. The varargs functions in error.c now use ANSI-C `stdarg' if available.
1775 d. The build process now treats the `build version' in .build as local to
1776 the build directory, so different versions built from the same source
1777 tree have different `build versions'.
1779 e. Some problems with the grammar have been fixed. (It used `list' in a few
1780 productions where `compound_list' was needed. A `list' must be terminated
1781 with a newline or semicolon; a `compound_list' need not be.)
1783 f. A fix was made to keep `wait' from hanging when waiting for all background
1786 g. `bash --help' now writes its output to stdout, like the GNU Coding Standards
1787 specify, and includes the machine type (the value of MACHTYPE).
1789 h. `bash --version' now prints more information and exits successfully, like
1790 the GNU Coding Standards specify.
1792 i. The output of `time' and `times' now prints fractional seconds with three
1793 places after the decimal point.
1795 j. A bug that caused process substitutions to screw up the pipeline printed
1796 by `jobs' was fixed.
1798 k. Fixes were made to the code that implements $'...' and $"..." so they
1801 l. The process substitution code now opens named pipes for reading with
1802 O_NONBLOCK to avoid hanging.
1804 m. Fixes were made to the trap code so the shell cleans up correctly if the
1805 trap command contains a `return' and we're executing a function or
1806 sourcing a script with `.'.
1808 n. Fixes to doc/Makefile.in so that it doesn't try to remake all of the
1809 documentation (ps, dvi, etc.) on a `make install'.
1811 o. Fixed an auto-increment error that caused bash -c args to sometimes dump
1814 p. Fixed a bug that caused $HISTIGNORE to fail when the history line
1815 contained globbing characters.
1817 2. Changes to Readline
1819 a. There is a new string variable, rl_library_version, available for use by
1820 applications. The current value is "2.1".
1822 b. A bug encountered when expand-tilde was enabled and file completion was
1823 attempted on a word beginning with `~/' was fixed.
1825 c. A slight change was made to the incremental search termination behavior.
1826 ESC still terminates the search, but if input is pending or arrives
1827 within 0.1 seconds (on systems with select(2)), it is used as a prefix
1828 character. This is intented to allow users to terminate searches with
1829 the arrow keys and get the behavior they expect.