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.