Bash-4.1 distribution source
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Chet Ramey
parent
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252 changed files with 51563 additions and 37176 deletions
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This document details the changes between this version, bash-4.1-rc,
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and the previous version, bash-4.1-beta.
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1. Changes to Bash
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a. Fixed a bug that caused printf to not return a partial value when it
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encountered an error while converting an integer argument.
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b. Fixed a bug that caused setting one of the compatNN options to not
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turn off the others.
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c. The (undocumented) --wordexp option is no longer included by default.
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d. Fixed a bug in conditional command execution that caused it to not
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correctly ignore the exit status under certain circumstances.
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e. Added a configure-time check for correctly-working asprintf/snprintf.
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f. Fixed some problems with line number calculation and display when sourcing
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a file in an interactive shell.
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g. Fixed a bug that caused the shell to crash when using `declare -A foo=bar'.
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h. Fixed a bug that caused an off-by-one error when calculating the directories
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to display with the PROMPT_DIRTRIM option.
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2. Changes to Readline
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a. Fixed a bug that caused applications using the callback interface to not
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react to SIGINT (or other signals) until another character arrived.
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------------------------------------------------------------------------------
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This document details the changes between this version, bash-4.1-beta,
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and the previous version, bash-4.1-alpha.
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1. Changes to Bash
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a. Fixed a bug in mapfile that caused the shell to crash if it was passed the
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name of an associative array.
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b. Fixed a bug that caused the shell to incorrectly split case patterns if
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they contained characters in $IFS.
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c. Fixed a bug that caused the shell to set $? to the wrong value when using
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a construct ending with a variable assignment with set -x enabled and PS4
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containing a command substitution.
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d. Fixed a bug that caused the shell to read commands incorrectly if an
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expansion error occurred under certain conditions in a user-specified
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subshell.
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e. Fixed a bug that caused the shell to set $? incorrectly if a parse error
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occurred in an evaluation context ("eval", trap command, dot script, etc.)
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f. Fixed a bug that caused the shell to attempt command substitution
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completion within a single-quoted string.
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g. Fixed a bug that caused the shell to insert an extra single quote during
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word completion.
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h. Fixed a bug that caused the shell to crash if invoked with the environment
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variable EMACS having a null value.
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i. Fixed a bug that caused bash to incorrectly report the presence of new
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mail in a `maildir' environment.
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j. Fixed a bug that caused the shell to not recognize a here-document ending
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delimiter inside a command substitution.
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k. Fixed a bug that caused the shell to crash when a a dynamic array variable
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was assigned a scalar value.
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2. Changes to Readline
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3. New Features in Bash
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a. The mapfile/readarray builtin no longer stores the commands it invokes via
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callbacks in the history list.
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b. There is a new `compat40' shopt option.
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c. The < and > operators to [[ do string comparisons using the current locale
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only if the compatibility level is greater than 40 (set to 41 by default).
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4. New Features in Readline
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------------------------------------------------------------------------------
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This document details the changes between this version, bash-4.1-alpha,
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and the previous version, bash-4.0-release.
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1. Changes to Bash
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a. Fixed bugs in the parser involving new parsing of the commands contained
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in command substitution when the substitution is read.
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b. Fixed a bug that caused the shell to dump core when performing programmable
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completion using a shell function.
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c. Fixed a bug in `mapfile' that caused it to invoke callbacks at the wrong
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time.
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d. Fixed a bug that caused the shell to dump core when listing jobs in the
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`exit' builtin.
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e. Fixed several bugs encountered when reading subscripts in associative
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array assignments and expansions.
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f. Fixed a bug that under some circumstances caused an associative array to
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be converted to an indexed array.
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g. Fixed a bug that caused syntax errors and SIGINT interrupts to not set
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$? to a value > 128.
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h. Fixed a bug that caused the shell to remove FIFOs associated with process
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substitution inside shell functions.
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i. Fixed a bug that caused terminal attributes to not be reset when the
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`read' builtin timed out.
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j. Fixed a bug in brace expansion that caused unwanted zero padding of the
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expanded terms.
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k. Fixed a bug that prevented the |& construct from working as intended when
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used with a simple command with additional redirections.
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l. Fixed a bug with the case statment ;& terminator that caused the shell to
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dereference a NULL pointer.
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m. Fixed a bug that caused assignment statements or redirections preceding
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a simple command name to inhibit alias expansion.
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n. Fixed the behavior of `set -u' to conform to the latest Posix interpretation:
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every expansion of an unset variable except $@ and $* will cause the
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shell to exit.
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o. Fixed a bug that caused double-quoted expansions of $* inside word
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expansions like ${x#$*} to not expand properly when $IFS is empty.
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p. Fixed a bug that caused traps to set $LINENO to the wrong value when they
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execute.
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q. Fixed a bug that caused off-by-one errors when computing history lines in
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the `fc' builtin.
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r. Fixed a bug that caused some terminating signals to not exit the shell
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quickly enough, forcing the kernel to send the signal (e.g., SIGSEGV)
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multiple times.
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s. Fixed a bug that caused the shell to attempt to add empty lines to the
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history list when reading here documents.
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t. Made some internal changes that dramatically speeds up sequential indexed
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array access.
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u. Fixed a bug that caused the shell to write past the end of a string when
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completing a double-quoted string ending in a backslash.
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v. Fixed a bug that caused the shell to replace too many characters when a
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pattern match was null in a ${foo//bar} expansion.
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w. Fixed bugs in the expansion of ** that caused duplicate directory names
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and the contents of the current directory to be omitted.
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x. Fixed a bug that caused $? to not be set correctly when referencing an
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unset variable with set -u and set -e enabled.
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y. Fixed a bug caused by executing an external program from the DEBUG trap
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while a pipeline was running. The effect was to disturb the pipeline
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state, occasionally causing it to hang.
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z. Fixed a bug that caused the ** glob expansion to dump core if it
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encountered an unsearchable directory.
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aa. Fixed a bug that caused `command -v' and `command -V' to not honor the
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path set by the -p option.
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bb. Fixed a bug that caused brace expansion to take place too soon in some
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compound array assignments.
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cc. Fixed a bug that caused programmable completion functions' changes to
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READLINE_POINT to not be reflected back to readline.
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dd. Fixed a bug that caused the shell to dump core if a trap was executed
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during a shell assignment statement.
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ee. Fixed an off-by-one error when computing the number of positional
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parameters for the ${@:0:n} expansion.
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ff. Fixed a problem with setting COMP_CWORD for programmable completion
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functions that could leave it set to -1.
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gg. Fixed a bug that caused the ERR trap to be triggered in some cases where
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`set -e' would not have caused the shell to exit.
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hh. Fixed a bug that caused changes made by `compopt' to not persist past the
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completion function in which compopt was executed.
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ii. Fixed a bug that caused the list of hostname completions to not be cleared
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when HOSTNAME was unset.
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jj. Fixed a bug that caused variable expansion in here documents to look in
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any temporary environment.
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kk. Bash and readline can now convert file names between precomposed and
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decomposed Unicode on Mac OS X ("keyboard" and file system forms,
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respectively). This affects filename completion (using new
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rl_filename_rewrite_hook), globbing, and readline redisplay.
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ll. The ERR and EXIT traps now see a non-zero value for $? when a parser
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error after set -e has been enabled causes the shell to exit.
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mm. Fixed a bug that in brace expansion that caused zero-prefixed terms to
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not contain the correct number of digits.
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nn. Fixed a bug that caused the shell to free non-allocated memory when
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unsetting an associative array which had had a value implicitly assigned
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to index "0".
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oo. Fixed a memory leak in the ${!prefix@} expansion.
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pp. Fixed a bug that caused printf to not correctly report all write errors.
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qq. Fixed a bug that caused single and double quotes to act as delimiters
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when splitting a command line into words for programmable completion.
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rr. Fixed a bug that caused ** globbing that caused **/path/* to match every
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directory, not just those matching `path'.
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ss. Fixed a bug that caused the shell to dump core when running `help' without
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arguments if the terminal width was fewer than 7 characters.
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2. Changes to Readline
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a. The SIGWINCH signal handler now avoids calling the redisplay code if
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one arrives while in the middle of redisplay.
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b. Changes to the timeout code to make sure that timeout values greater
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than one second are handled better.
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c. Fixed a bug in the redisplay code that was triggered by a prompt
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containing invisible characters exactly the width of the screen.
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d. Fixed a bug in the redisplay code encountered when running in horizontal
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scroll mode.
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e. Fixed a bug that prevented menu completion from properly completing
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filenames.
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f. Fixed a redisplay bug caused by a multibyte character causing a line to
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wrap.
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g. Fixed a bug that caused key sequences of two characters to not be
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recognized when a longer sequence identical in the first two characters
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was bound.
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h. Fixed a bug that caused history expansion to be attempted on $'...'
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single-quoted strings.
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i. Fixed a bug that caused incorrect redisplay when the prompt contained
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multibyte characters in an `invisible' sequence bracketed by \[ and
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\].
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j. Fixed a bug that caused history expansion to short-circuit after
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encountering a multibyte character.
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3. New Features in Bash
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a. Here-documents within $(...) command substitutions may once more be
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delimited by the closing right paren, instead of requiring a newline.
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b. Bash's file status checks (executable, readable, etc.) now take file
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system ACLs into account on file systems that support them.
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c. Bash now passes environment variables with names that are not valid
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shell variable names through into the environment passed to child
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processes.
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d. The `execute-unix-command' readline function now attempts to clear and
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reuse the current line rather than move to a new one after the command
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executes.
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e. `printf -v' can now assign values to array indices.
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f. New `complete -E' and `compopt -E' options that work on the "empty"
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completion: completion attempted on an empty command line.
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g. New complete/compgen/compopt -D option to define a `default' completion:
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a completion to be invoked on command for which no completion has been
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defined. If this function returns 124, programmable completion is
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attempted again, allowing a user to dynamically build a set of completions
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as completion is attempted by having the default completion function
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install individual completion functions each time it is invoked.
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h. When displaying associative arrays, subscripts are now quoted.
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i. Changes to dabbrev-expand to make it more `emacs-like': no space appended
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after matches, completions are not sorted, and most recent history entries
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are presented first.
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j. The [[ and (( commands are now subject to the setting of `set -e' and the
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ERR trap.
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k. The source/. builtin now removes NUL bytes from the file before attempting
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to parse commands.
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l. There is a new configuration option (in config-top.h) that forces bash to
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forward all history entries to syslog.
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m. A new variable $BASHOPTS to export shell options settable using `shopt' to
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child processes.
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n. There is a new confgure option that forces the extglob option to be
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enabled by default.
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o. New variable $BASH_XTRACEFD; when set to an integer bash will write xtrace
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output to that file descriptor.
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p. If the optional left-hand-side of a redirection is of the form {var}, the
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shell assigns the file descriptor used to $var or uses $var as the file
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descriptor to move or close, depending on the redirection operator.
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q. The < and > operators to the [[ conditional command now do string
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comparison according to the current locale.
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r. Programmable completion now uses the completion for `b' instead of `a'
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when completion is attempted on a line like: a $(b c.
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s. Force extglob on temporarily when parsing the pattern argument to
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the == and != operators to the [[ command, for compatibility.
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t. Changed the behavior of interrupting the wait builtin when a SIGCHLD is
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received and a trap on SIGCHLD is set to be Posix-mode only.
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u. The read builtin has a new `-N nchars' option, which reads exactly NCHARS
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characters, ignoring delimiters like newline.
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4. New Features in Readline
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a. New bindable function: menu-complete-backward.
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b. In the vi insertion keymap, C-n is now bound to menu-complete by default,
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and C-p to menu-complete-backward.
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c. When in vi command mode, repeatedly hitting ESC now does nothing, even
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when ESC introduces a bound key sequence. This is closer to how
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historical vi behaves.
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d. New bindable function: skip-csi-sequence. Can be used as a default to
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consume key sequences generated by keys like Home and End without having
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to bind all keys.
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e. New application-settable function: rl_filename_rewrite_hook. Can be used
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to rewite or modify filenames read from the file system before they are
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compared to the word to be completed.
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f. New bindable variable: skip-completed-text, active when completing in the
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middle of a word. If enabled, it means that characters in the completion
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that match characters in the remainder of the word are "skipped" rather
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than inserted into the line.
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g. The pre-readline-6.0 version of menu completion is available as
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"old-menu-complete" for users who do not like the readline-6.0 version.
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h. New bindable variable: echo-control-characters. If enabled, and the
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tty ECHOCTL bit is set, controls the echoing of characters corresponding
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to keyboard-generated signals.
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i. New bindable variable: enable-meta-key. Controls whether or not readline
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sends the smm/rmm sequences if the terminal indicates it has a meta key
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that enables eight-bit characters.
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------------------------------------------------------------------------------
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This document details the changes between this version, bash-4.0-release,
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||||
and the previous version, bash-4.0-rc1.
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||||
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||||
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@ -601,7 +973,7 @@ bb. The command assigned to a key sequence with `bind -x' now sets two new
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and cursor position by modifying READLINE_LINE_BUFFER and READLINE_POINT,
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respectively.
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cc. There is a new >>& redirection operator, which appends the standard output
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cc. There is a new &>> redirection operator, which appends the standard output
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and standard error to the named file.
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dd. The parser now understands `|&' as a synonym for `2>&1 |', which redirects
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