This document details the changes between this version, bash-2.01.1-release, and the previous version, bash-2.01-release. 1. Changes to Bash a. The select command was fixed to check the validity of the user's input more strenuously. b. A bug was fixed that prevented `time' from timing commands correctly when supplied as an argument to `bash -c'. c. A fix was made to the mail checking code to keep from adding the same mail file to the list of files to check multiple times when parsing $MAILPATH. d. Fixed an off-by-one error in the tilde expansion library. e. When using the compound array assignment syntax, the old value of the array is cleared before assigning the new value. f. Fixed a bug that could cause a core dump when a trap handler was reset to the default in the trap command associated with that signal. g. Fixed a bug in the locale code that occurred when assigning a value to LC_ALL. h. A change was made to the parser so that words of the form xxx=(...) are not considered compound assignment statements unless there are characters before the `='. i. A fix was made to the command tracing code to correctly quote each word of output. j. Some changes were made to the bash-specific autoconf tests to make them more portable. k. Completion of words with globbing characters now correctly quotes the result. l. The directory /var/spool/mail is now preferred to /usr/spool/mail when configure is deciding on the default mail directory. m. The brace completion code was fixed to not quote the `{' and `}'. n. Some fixes were made to make $RANDOM more random in subshells. o. System-specific changes were made to configure for: SVR4.2 p. Changes were made so that completion of words containing globbing chars substitutes the result only if a single filename was matched. q. The window size is now recomputed after a job is stopped with SIGTSTP if the user has set `checkwinsize' with `shopt'. r. When doing substring expansion, out-of-range substring specifiers now cause nothing to be substituted rather than an expansion error. s. A fix was made so that you can no longer trap `SIGEXIT' or `SIGDEBUG' -- only `EXIT' and `DEBUG' are accepted. t. The display of trapped signals now uses the signal number if signals for which bash does not know the name are trapped. u. A fix was made so that `bash -r' does not turn on restricted mode until after the startup files are executed. v. A bug was fixed that occasionally caused a core dump when a variable found in the temporary environment of export/declare/readonly had a null value. w. A bug that occasionally caused unallocated memory to be passed to free() when doing arithmetic substitution was fixed. x. A bug that caused a buffer overrun when expanding a prompt string containing `\w' and ${#PWD} exceeded PATH_MAX was fixed. y. A problem with the completion code that occasionally caused it to refer to a character before the beginning of the readline line buffer was fixed. z. A bug was fixed so that the `read' builtin restarts reads when interrupted by signals other than SIGINT. aa. Fixed a bug that caused a command to be freed twice when there was an evaluation error in the `eval' command. 2. Changes to Readline a. Added a missing `extern' to a declaration in readline.h that kept readline from compiling cleanly on some systems. b. The history file is now opened with mode 0600 when it is written for better security. c. Changes were made to the SIGWINCH handling code so that prompt redisplay is done better. d. ^G now interrupts incremental searches correctly. e. A bug that caused a core dump when the set of characters to be quoted when completing words was empty was fixed. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.01-release, and the previous version, bash-2.01-beta2. 1. Changes to Bash a. The `distclean' target should remove the `printenv' executable if it has been created. b. The test suite was changed slightly to ensure that the error messages are printed in English. c. A bug that caused the shell to dump core when a filename containing a `/' was passed to `hash' was fixed. d. Pathname canonicalization now leaves a leading `//' intact, as POSIX.1 requires. e. A memory leak when completing commands was fixed. f. A memory leak that occurred when checking the hash table for commands with relative paths was fixed. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.01-beta2, and the previous version, bash-2.01-beta1. 1. Changes to Bash a. The `ulimit' builtin translates RLIM_INFINITY to the hard limit only if the current (soft) limit is less than or equal to the hard limit. b. Fixed a bug that caused the bash emulation of strcasecmp to produce incorrect results. c. A bug that caused memory to be freed twice when a trap handler resets the trap more than once was fixed. d. A bug that caused machines where sizeof (pointer) > sizeof (int) to fail (and possibly dump core) when trying to unwind-protect a null pointer was fixed. e. The startup files should not be run with job control enabled. This fix allows SIGINT to once again interrupt startup file execution. f. Bash should not change the SIGPROF handler if it is set to something other than SIG_DFL. g. The completion code that provides bash-specific completions for readline now quotes characters that the readline code would treat as word break characters if they appear in a file name. h. The completion code now correctly quotes filenames containing a `!', even if the user attempted to use double quotes when attempting completion. i. A bug that caused the shell to dump core when `disown' was called without arguments and there was no current job was fixed. j. A construct like $((foo);bar) is now processed as a command substitution rather than as a bad arithmetic substitution. k. A couple of bugs that caused `fc' to not obey the `cmdhist' and `lithist' shell options when editing and re-executing a series of commands were fixed. l. A fix was made to the grammar -- the list of commands between `do' and `done' in the body of a `for' command should be treated the same as a while loop. 2. Changes to Readline a. A couple of bugs that caused the history search functions to attempt to free a NULL pointer were fixed. b. If the C library provides setlocale(3), readline does not need to look at various environment variables to decide whether or not to go into eight-bit mode automatically -- just check whether the current locale is not `C' or `POSIX'. c. If the filename completion function finds that a directory was not closed by a previous (interrupted) completion, it closes the directory with closedir(). 3. New Features in Bash a. New bindable readline commands: history-and-alias-expand-line and alias-expand-line. The code was always in there, there was just no way to execute it. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.01-beta1, and the previous version, bash-2.01-alpha1. 1. Changes to Bash a. Fixed a problem that could cause file descriptors used for process substitution to conflict with those used explicitly in redirections. b. Made it easier to regenerate configure if the user changes configure.in. c. ${GROUPS[0]} should always be the primary group, even on systems without multiple groups. d. Spelling correction is no longer enabled by default. e. Fixes to quoting problems in `bashbug'. f. OS-specific configuration changes were made for: Irix 6. g. OS-specific code changes were made for: QNX. h. A more meaningful message is now printed when the file in /tmp for a here document cannot be created. i. Many changes to the shell's variable initialization code to speed non-interactive startup. j. Changes to the non-job-control code so that it does not try to open /dev/tty. k. The output of `set' and `export' is once again sorted, as POSIX wants. l. Fixed a problem caused by a recursive call reparsing the value of $SHELLOPTS. m. The tilde code no longer calls getenv() when it's compiled as part of the shell, which should eliminate problems on systems that cannot redefine getenv(), like the NeXT OS. n. Fixed a problem that caused `bash -o' or `bash +o' to not list all the shell options. o. Fixed `ulimit' to convert RLIM_INFINITY to the appropriate hard limit only if the hard limit is greater than the current (soft) limit. p. Fixed a problem that arose when building bash in a different directory than the source and y.tab.[ch] were remade with something other than bison. This came up most often on NetBSD. q. Fixed a problem with completion -- it thought that `pwd`/[TAB] indicated an unfinished command completion (`/), which generated errors. r. The bash special tilde expansions (~-, ~+) are now attempted before calling the standard tilde expansion code, which should eliminate the problems people have been seeing with this on Solaris 2.5.1. s. Added support for to places where it was missing. t. Changed the code that reads the output of a command substitution to not go through stdio. This reduces the memory requirements and is faster. u. A number of changes to speed up export environment creation were made. v. A number of memory leaks were fixed as the result of running the test scripts through Purify. w. Fixed a bug that caused subshells forked to interpret executable scripts without a leading `#!' to not reinitialize the values of the shell options. 2. Changes to Readline a. History library has less `#ifdef SHELL' code -- abstracted stuff out into application-specific function hooks. b. Readline no longer calls getenv() if it's compiled as part of the shell, which should eliminate problems on systems that cannot redefine getenv(), like the NeXT OS. c. Fixed translation of ESC when `untranslating' macro values. d. The region kill operation now fixes the mark if it ends up beyond the boundaries of the line after the region is deleted. 3. New Features in Bash a. New argument for `configure': `--with-curses'. This can be used to override the selection of the termcap library on systems where it is deficient. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.01-alpha1, and the previous version, bash-2.0-release. 1. Changes to Bash a. System-specific configuration changes for: FreeBSD, SunOS4, Irix, MachTen, QNX 4.2, Harris Night Hawk, SunOS5. b. System-specific code changes were made for: Linux, 4.4 BSD, QNX 4.2, HP-UX, AIX 4.2. c. A bug that caused the exec builtin to fail because the full pathname of the command could not be found was fixed. d. The code that performs output redirections is now more resistant to race conditions and possible security exploits. e. A bug that caused the shell to dump core when performing pattern substitutions on variable values was fixed. f. More hosts are now recognized by the auto-configuration mechanism (OpenBSD, QNX, others). g. Assignments to read-only variables that attempt to convert them to arrays are now errors. h. A bug that caused shell scripts using array assignments in POSIX mode to exit after the assignment was performed was fixed. i. The substring expansion code is now more careful about running off the ends of the expanded variable value. j. A bug that caused completion to fail if a backquoted command substitution appeared anywhere on the line was fixed. k. The `source' builtin no longer turns off history if it has been enabled in a non-interactive shell. l. A bug that caused the shell to crash when `disown' was given a pid instead of a job number was fixed. m. The `cd' spelling correction code will not try to change to `.' if no directory entries match a single-character argument. n. A bad variable name supplied to `declare', `export', or `readonly' no longer causes a non-interactive shell in POSIX mode to exit. o. Some fixes were made to the test suite to handle peculiarities of various Unix versions. p. The bash completion code now quotes characters that readline would treat as word breaks for completion but are not shell metacharacters. q. Bad options supplied at invocation now cause a usage message to be displayed. r. Fixes were made to the code that handles DEBUG traps so that the trap string is not freed inappropriately. s. Some changes were made to the bash debugger in examples/bashdb -- it should be closer to working now. t. A problem that caused the default filename used for mail checking to be wrong was fixed. u. A fix was made to the `echo' builtin so that NUL characters printed with `echo -e' do not cause the output to be truncated. v. A fix was made to the job control code so that the shell behaves better when monitor mode is enabled in a non-interactive shell. w. Bash no longer catches all of the terminating signals in a non- interactive shell until a trap is set on EXIT, which should result in quicker startup. x. A fix was made to the command timing code so that `time' can be used in a loop. y. A fix was made to the parser so that `((cmd); cmd2)' is now parsed as a nested subshell rather than strictly as an (errnoeous) arithmetic command. z. A fix was made to the globbing code so that it correctly matches quoted filenames beginning with a `.'. aa. A bug in `fc' that caused some multi-line commands to not be stored as one command in the history when they were re-executed after editing (with `fc -e') was fixed. bb. The `ulimit' builtin now attempts to catch some classes of integer overflows. cc. The command-oriented-history code no longer attempts to add `;' inappropriately when a newline appears while reading a $(...) command substitution. dd. A bug that caused the shell to dump core when `help --' was executed was fixed. ee. A bug that caused the shell to crash when an unset variable appeared in the body of a here document after `set -u' had been executed was fixed. ff. Implicit input redirections from /dev/null for asynchronous commands are now handled better. gg. A bug that caused the shell to fail to compile when configured with `--disable-readline' was fixed. hh. The globbing code should now be interruptible. ii. Bash now notices when the `kill' builtin is used to send SIGCONT to a stopped job and adjusts the data structures accordingly, as if `bg' had been executed instead. jj. A bug that caused the shell to crash when mixing calls to `getopts' and `shift' on the same set of positional parameters was fixed. kk. The command printing code now preserves the `-p' flag to `time'. ll. The command printing code now handles here documents better when there are other redirections associated with the command. mm. The special glibc environment variable (NNN_GNU_nonoption_argv_flags_) is no longer placed into the environment of executed commands -- users of glibc had too many problems with it. nn. Reorganized the code that generates signames.h. The signal_names list is now more complete but may be slightly different (SIGABRT is favored over SIGIOT, for example). The preferred signal names are those listed in the POSIX.2 standard. oo. `bashbug' now uses a filename shorter than 14 characters for its temporary file, and asks for confirmation before sending the bug report. pp. A bug that caused TAB completion in vi editing mode to not be turned off when `set -o posix' was executed or back on when `set +o posix' was executed was fixed. qq. A bug in the brace expansion code that caused brace expansions appearing in new-style $(...) command substitutions to be inappropriately expanded was fixed. rr. A bug in the readline hook shell-expand-line that could cause memory to be inappropriately freed was fixed. ss. A bug that caused some arithmetic expressions containing `&&' and `||' to be parsed with the wrong precedence has been fixed. tt. References to unbound variables after `set -u' has been executed now cause the shell to exit immediately, as they should. uu. A bug that caused the shell to exit inappropriately when `set -e' had been executed and a command's return status was being inverted with the `!' reserved word was fixed. vv. A bug that could occasionally cause the shell to crash with a divide-by-zero error when timing a command was fixed. ww. A bug that caused parameter pattern substitution to leave stray backslashes in the replacement string when the expression is in double quotes was fixed. xx. The `break' and `continue' builtins now break out of all loops when an invalid count argument is supplied. yy. Fixed a bug that caused PATH to be set to the empty string if `command -p' is executed with PATH unset. zz. Fixed `kill -l signum' to print the signal name without the `SIG' prefix, as POSIX specifies. aaa. Fixed a bug that caused the shell to crash while setting $SHELLOPTS if there were no shell options set. bbb. Fixed `export -p' and `readonly -p' so that when the shell is in POSIX mode, their output is as POSIX.2 specifies. ccc. Fixed a bug in `readonly' so that `readonly -a avar=(...)' actually creates an array variable. ddd. Fixed a bug that prevented `time' from correctly timing background pipelines. 2. Changes to Readline a. A bug that caused an extra newline to be printed when the cursor was on an otherwise empty line was fixed. b. An instance of memory being used after it was freed was corrected. c. The redisplay code now works when the prompt is longer than the screen width. d. `dump-macros' is now a bindable name, as it should have been all along. e. Non-printable characters are now expanded when displaying macros and their values. f. The `dump-variables' and `dump-macros' commands now output a leading newline if they're called as the result of a key sequence, rather than directly by an application. 3. New Features in Bash a. There is a new builtin array variable: GROUPS, the set of groups to which the user belongs. This is used by the test suite. 4. New Features in Readline a. If a key sequence bound to `universal-argument' is read while reading a numeric argument started with `universal-argument', it terminates the argument but is otherwise ignored. This provides a way to insert multiple instances of a digit string, and is how GNU emacs does it. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.0-release, and the previous version, bash-2.0-beta3. 1. Changes to Bash a. Fix to the `getopts' builtin so that it does the right thing when a required option argument is not present. b. The completion code now updates the common prefix of matched names after FIGNORE processing is done, since any names that were removed may have changed the common prefix. c. Fixed a bug that made messages in MAILPATH entries not work correctly. d. Fixed a serious documentation error in the description of the new ${parameter:offset[:length]} expansion. e. Fixes to make parameter substring expansion ({$param:offset[:length]}) work when within double quotes. f. Fixes to make ^A (CTLESC) survive an unquoted expansion of positional parameters. g. Corrected a misspelling of `unlimited' in the output of `ulimit'. h. Fixed a bug that caused executable scripts without a leading `#!' to occasionally pick up the wrong set of positional parameters. i. Linux systems now have a working `ulimit -v', using RLIMIT_AS. j. Updated config.guess so that many more machine types are recognized. k. Fixed a bug with backslash-quoted slashes in the ${param/pat[/sub]} expansion. l. If the shell is named `-su', and `-c command' is supplied, read and execute the login shell startup files even though the shell is not interactive. This is to support the `-' option to `su'. m. Fixed a bug that caused core dumps when the DEBUG trap was ignored with `trap "" DEBUG' and a shell function was subsequently executed. n. Fixed a bug that caused core dumps in the read builtin when IFS was set to the null string and the input had leading whitespace. 2. Changes to Readline a. Fixed a bug that caused a numeric argument of 1024 to be ignored when inserting text. b. Fixed the display code so that the numeric argument is displayed as it's being entered. c. Fixed the numeric argument reading code so that `M-- command' is equivalent to `M--1 command', as the prompt implies. 3. New Features in Bash a. `ulimit' now sets both hard and soft limits and reports the soft limit by default (when neither -H nor -S is specified). This is compatible with versions of sh and ksh that implement `ulimit'. b. Integer constants have been extended to base 64. 4. New Features in Readline a. The `home' and `end' keys are now bound to beginning-of-line and end-of-line, respectively, if the corresponding termcap capabilities are present. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.0-beta3, and the previous version, bash-2.0-beta2. 1. Changes to Bash a. System-specific changes for: AIX 4.2, SCO 3.2v[45], HP-UX. b. When in POSIX mode, variable assignments preceding a special builtin persist in the shell environment after the builtin completes. c. Changed all calls to getwd() to getcwd(). Improved check for systems where the libc getcwd() calls popen(), since that breaks on some systems when job control is being used. d. Fixed a bug that caused seg faults when executing scripts with the execute bit set but without a leading `#!'. e. The environment passed to executed commands is never sorted. f. A bug was fixed in the code that expands ${name[@]} to the number of elements in an array variable. g. A bug was fixed in the array compound assignment code ( A=( ... ) ). h. Window size changes now correctly propagate down to readline if the shopt `checkwinsize' option is enabled. i. A fix was made in the code that expands to the length of a variable value (${#var}). j. A fix was made to the command builtin so that it did not turn on the `no fork' flag inappropriately. k. A fix was made to make `set -n' work more reliably. l. A fix was made to the job control initialization code so that the terminal process group is set to the shell's process group if the shell changes its own process group. 2. Changes to Readline a. System-specific changes for: SCO 3.2v[45]. b. The behavior of the vi-mode `.' when redoing an `i' command was changed to insert the text previously inserted by the `i' command rather than simply entering insert mode. 3. New features in Bash a. There is a new version of the autoload function package, in examples/functions/autoload.v2, that uses arrays and provides more functionality. b. Support for LC_COLLATE and locale-specific sorting of the results of pathname expansion if strcoll() is available. 4. New Features in Readline a. Support for locale-specific sorting of completion possibilities if strcoll() is available. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.0-beta2, and the previous version, bash-2.0-beta1. 1. Changes to Bash a. `pushd -' is once again equivalent to `pushd $OLDPWD'. b. OS-specific changes for: SCO 3.2v[45]. c. A change was made to the fix for the recently-reported security hole when reading characters with octal value 255 to make it work better on systems with restartable system calls when not using readline. d. Some changes were made to the test suite so that it works if you configure bash with --enable-usg-echo-default. e. A fix was made to the parsing of conditional arithmetic expressions. f. Illegal arithmetic bases now cause an arithmetic evaluation error rather than being silently reset. g. Multiple arithmetic bases now cause an arithmetic evaluation error instead of being ignored. h. A fix was made to the evaluation of ${param?word} to conform to POSIX.2. i. A bug that sometimes caused array indices to be evaluated twice (which would cause errors when they contained assignment statements) was fixed. j. `ulimit' was rewritten to avoid problems with getrlimit(2) returning unsigned values and to simplify the code. k. A bug in the command-oriented-history code that caused it to sometimes put semicolons after right parens inappropriately was fixed. l. The values inserted into the prompt by the \w and \W escape sequences are now quoted to prevent further expansion. m. An interactive shell invoked as `sh' now reads and executes commands from the file named by $ENV when it starts up. If it's a login shell, it does this after reading /etc/profile and ~/.profile. n. The file named by $ENV is never read by non-interactive shells. 2. Changes to Readline a. A few changes were made to hide some macros and functions that should not be public. b. An off-by-one error that caused seg faults in the history expansion code was fixed. 3. New Features in Bash a. The ksh-style ((...)) arithmetic command was implemented. It is exactly identical to let "...". This is controlled by a new option to configure, `--enable-dparen-arithmetic', which is on by default. b. There is a new #define available in config.h.top: SYS_BASH_LOGOUT. If defined to a filename, bash reads and executes commands from that file when a login shell exits. It's commented out by default. c. `ulimit' has a `-l' option that reports the maximum amount of data that may be locked into memory on 4.4BSD-based systems. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.0-beta1, and the previous version, bash-2.0-alpha4. 1. Changes to Bash a. A bug that sometimes caused traps to be ignored on signals the shell treats specially was fixed. b. The internationalization code was changed to track the values of LC_* variables and call setlocale() as appropriate. The TEXTDOMAIN and TEXTDOMAINDIR variables are also tracked; changes cause calls to textdomain() and bindtextdomain(), if available. c. A bug was fixed that sometimes caused double-quoted strings to be parsed incorrectly. d. Changes were made so that the siglist code compiles correctly on Solaris 2.5. e. Added `:' to the set of characters that cause word breaks for the completion code so that pathnames in assignments to $PATH can be completed. f. The `select' command was fixed to print $PS3 to stderr. g. Fixed an error in the manual page section describing the effect that setting and unsetting GLOBIGNORE has on the setting of the `dotglob' option. h. The time conversion code now uses CLK_TCK rather than CLOCKS_PER_SEC on systems without gettimeofday() and resources. i. The getopt static variables are now initialized each time a subshell is started, so subshells using `getopts' work right. j. A sign-extension bug that caused a possible security hole was fixed. k. The parser now reads characters between backquotes within a double- quoted string as a single word, so double quotes in the backquoted string don't terminate the enclosing double-quoted string. l. A bug that caused `^O' to work incorrectly when typed as the first thing to an interactive shell was fixed. m. A rarely-exercised off-by-one error in the code that quotes variable values was fixed. n. Some memory and file descriptor leaks encountered when running a shell script that is executable but does not have a leading `#!' were plugged. 2. Changes to Readline a. A bug that sometimes caused incorrect results when trying to read typeahead on systems without FIONREAD was fixed. 3. New Features in Bash a. The command timing code now uses the value of the TIMEFORMAT variable to format and display timing statistics. b. The `time' reserved word now accepts a `-p' option to force the POSIX.2 output format. c. There are a couple of new and updated scripts to convert csh startup files to bash format. d. There is a new builtin array variable: BASH_VERSINFO. The various members hold the parts of the version information in BASH_VERSION, plus the value of MACHTYPE. 4. New Features in Readline a. Setting LANG to `en_US.ISO8859-1' now causes readline to enter eight-bit mode. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.0-alpha4, and the previous version, bash-2.0-alpha3. 1. Changes to Bash a. There is better detection of rsh connections on Solaris 2. b. Assignments to read-only variables preceding a command name are now variable assignment errors. Variable assignment errors cause non-interactive shells running in posix mode to exit. c. The word tokenizer was rewritten to handle nested quotes and pairs ('', "", ``, ${...}, $(...), $[...], $'...', $"...", <(...), >(...)) correctly. Some of the parameter expansion code was updated as a consequence. d. A fix was made to `test' when given three arguments so that a binary operator is checked for first, before checking that the first argument is `!'. e. 2''>/dev/null is no longer equivalent to 2>/dev/null. f. Parser error messages were regularized, and in most cases the name of the shell script being read by a non-interactive shell is not printed twice. g. A fix was made to the completion code so that it no longer removes the text the user typed in some cases. h. The special glibc `getopt' environment variable is no longer put into the environment on machines with small values of ARG_MAX. i. The expansion of ${...} now follows the POSIX.2 rules for finding the closing `}'. j. The shell no longer displays spurious status messages for background jobs in shell scripts that complete successfully when the script is run from a terminal. k. `shopt -o' now correctly updates $SHELLOPTS. l. A bug that caused the $PATH searching code to return a non-executable file even when an executable file with the same name appeared later in $PATH was fixed. m. The shell now does tilde expansions on unquoted `:~' in assignment statements when not in posix mode. n. Variable assignment errors when a command consists only of assignments now cause non-interactive shells to exit when in posix mode. o. If the variable in a `for' or `select' command is read-only, or not a legal shell identifier, a variable assignment error occurs. p. `test' now handles `-a' and `-o' as binary operators when three arguments are supplied, and correctly parses `( word )' as equivalent to `word'. q. `test' was fixed so that file names of the form /dev/fd/NN mean the same thing on all systems, even Linux. r. Fixed a bug in the globbing code that caused patterns with multiple consecutive `*'s to not be matched correctly. s. Fixed a bug that caused $PS2 to not be printed when an interactive shell not using readline is reading a here document. t. Fixed a bug that caused history expansion to be performed inappropriately when a single-quoted string spanned more than one line. u. `getopts' now checks that the variable name passed by the user as the second argument is a legal shell identifier and that the variable is not read-only. v. Fixed `getopts' to obey POSIX.2 rules for setting $OPTIND when it encounters an error. w. Fixed `set' to display variable values in a form that can be re-read. x. Fixed a bug in the code that keeps track of whether or not local variables have been declared at the current level of function nesting. y. Non-interactive shells in posix mode now exit if the name in a function declaration is not a legal identifier. z. The job control code now ignores stopped children when the shell is not interactive. aa. The `cd' builtin no longer attempts spelling correction on the directory name if the shell is not interactive, regardless of the setting of the `cdspell' option. bb. Some OS-specific changes were made for SCO 3.2v[45] and AIX 4.2. cc. `time' now prints its output to stderr, as POSIX.2 specifies. 2. Fixes to Readline a. After printing possible completions, all lines of a multi-line prompt are redisplayed. b. Some changes were made to the terminal handling code in rltty.c to work around AIX 4.2 bugs. 3. New Features in Bash a. There is a new loadable builtin: sprintf, with calling syntax sprintf var format [args] This provides an easy way to simulate ksh left- and right-justified variable values. b. The expansions of \h and \H in prompt strings were swapped. \h now expands to the hostname up to the first `.', as in bash-1.14. 4. New Features in Readline a. The bash-1.14 behavior when ^M is typed while doing an incremental search was restored. ^J may now be used to terminate the search without accepting the line. b. There is a new bindable variable: disable-completion. This inhibits word completion and causes the completion character to be inserted as if it had been bound to self-insert. ------------------------------------------------------------------------------ This document details the changes between this version, bash-2.0-alpha3, and the previous version, bash-2.0-alpha2. There is now a file `COMPAT' included in the distribution that lists the user-visible incompatibilities between 1.14 and 2.0. 1. Changes to Bash a. Some work was done so that word splitting of the rhs of assignment statements conforms more closely to historical practice. b. A couple of errant memory frees were fixed. c. A fix was made to the test builtin so it recognizes `<' and `>' as binary operators. d. The GNU malloc in lib/malloc/malloc.c now scrambles memory as it's allocated and freed. This is to catch callers that refer to freed memory or assume something about newly-allocated memory. e. Fixed a problem with conversion to 12-hour time in the prompt expansion code. f. Fixed a problem with configure's argument parsing order. Now you can correctly turn on specific options after using --enable-minimal-config. g. The configure script now automatically disables the use of GNU malloc on systems where it's appropriate (better than having people read the NOTES file and do it manually). h. There are new prompt expansions (\v and \V) to insert version information into the prompt strings. i. The default prompt string now includes the version number. j. Most of the builtins that take no options were changed to use the internal getopt so they can produce proper error messages for -? and incorrect options. k. Some system-specific changes were made for SVR4.2 and Solaris 2.5. l. Bash now uses PATH_MAX instead of MAXPATHLEN and NAME_MAX instead of MAXNAMLEN. m. A couple of problems caused by uninitialized variables were fixed. n. There are a number of new loadable builtin examples: logname, basename, dirname, tty, pathchk, tee, head, and rmdir. All of these conform to POSIX.2. o. Bash now notices changes in TZ and calls tzset() if present, so changing TZ will alter the time printed by prompt expansions. p. The source was reorganized a bit so I don't have to wait so long for some files to compile, and to facilitate the creation of a `shell library' at some future point. q. Bash no longer turns off job control if called as `sh', since the POSIX.2 spec includes job control as a standard feature. r. `bash -o posix' now works as intended. s. Fixed a problem with the completion code: when completing a filename that contained globbing characters, if show-all-if-ambiguous was set, the completion code would remove the user's text. t. Fixed ulimit so that (hopefully) the full range of limits is available on HPUX systems. u. A new `shopt' option (`hostcomplete') enables and disables hostname completion. v. The shell no longer attempts to save the history on an abort(), which is usually called by programming_error(). w. The `-s' option to `fc' was changed to echo the command to be executed to stderr instead of stdout. x. If the editor invoked by `fc -e' exits with a non-zero status, no commands are executed. y. Fixed a bug that made the shopt `histverify' option work incorrectly. z. There is a new variable `MACHTYPE' whose value is the GNU-style `cpu-company-system' system description as set by configure. (The values of MACHTYPE and HOSTTYPE should really be swapped.) aa. The `ulimit' builtin now allows the maximum virtual memory size to be set via setrlimit(2) if RLIMIT_VMEM is defined. bb. `bash -nc 'command'' no longer runs `command'. 2. Changes to Readline a. Fixed a typo in the code that checked for FIONREAD in input.c. b. Fixed a bug in the code that outputs keybindings, so things like C-\ are quoted properly. c. Fixed a bug in the inputrc file parsing code to handle the problems caused by inputrc files created from the output of `bind -p' in previous versions of bash. The problem was due to the bug fixed in item b above. d. Readline no longer turns off the terminal's meta key, and turns it on once the first time it's called. ------------------------------------------------------------------------------ This file documents the changes between this version, bash-2.0-alpha2, and the previous version, bash-2.0-alpha. 1. Changes to Bash a. The shell no longer thinks directories are executable. b. `disown' has a new option, `h', which inhibits the resending of SIGHUP but does not remove the job from the jobs table. c. The varargs functions in error.c now use ANSI-C `stdarg' if available. d. The build process now treats the `build version' in .build as local to the build directory, so different versions built from the same source tree have different `build versions'. e. Some problems with the grammar have been fixed. (It used `list' in a few productions where `compound_list' was needed. A `list' must be terminated with a newline or semicolon; a `compound_list' need not be.) f. A fix was made to keep `wait' from hanging when waiting for all background jobs. g. `bash --help' now writes its output to stdout, like the GNU Coding Standards specify, and includes the machine type (the value of MACHTYPE). h. `bash --version' now prints more information and exits successfully, like the GNU Coding Standards specify. i. The output of `time' and `times' now prints fractional seconds with three places after the decimal point. j. A bug that caused process substitutions to screw up the pipeline printed by `jobs' was fixed. k. Fixes were made to the code that implements $'...' and $"..." so they work as documented. l. The process substitution code now opens named pipes for reading with O_NONBLOCK to avoid hanging. m. Fixes were made to the trap code so the shell cleans up correctly if the trap command contains a `return' and we're executing a function or sourcing a script with `.'. n. Fixes to doc/Makefile.in so that it doesn't try to remake all of the documentation (ps, dvi, etc.) on a `make install'. o. Fixed an auto-increment error that caused bash -c args to sometimes dump core. p. Fixed a bug that caused $HISTIGNORE to fail when the history line contained globbing characters. 2. Changes to Readline a. There is a new string variable, rl_library_version, available for use by applications. The current value is "2.1". b. A bug encountered when expand-tilde was enabled and file completion was attempted on a word beginning with `~/' was fixed. c. A slight change was made to the incremental search termination behavior. ESC still terminates the search, but if input is pending or arrives within 0.1 seconds (on systems with select(2)), it is used as a prefix character. This is intented to allow users to terminate searches with the arrow keys and get the behavior they expect.