+This document details the changes between this version, bash-4.3-release, and
+the previous version, bash-4.3-rc2.
+
+1. Changes to Bash
+
+a. Only Posix-mode shells should exit on an assignment failure in the
+ temporary environment preceding a special builtin. This is how it's been
+ documented.
+
+b. Fixed a bug that caused a failed special builtin to not exit a posix-mode
+ shell if the failing builtin was on the LHS of a && or ||.
+
+c. Changed the handling of unquoted backslashes in regular expressions to be
+ closer to bash-4.2.
+
+d. globstar (**) no longer traverses symbolic links that resolve to
+ directories. This eliminates some duplicate entries.
+
+e. Fixed a bug that caused a SIGCHLD trap handler to not be able to change the
+ SIGCHLD disposition.
+
+f. Fixed a bug that caused a crash when -x was enabled and a command
+ contained a printable multibyte (wide) character.
+
+g. Fixed a bug that caused an interactive shell without line editing enabled
+ to read invalid data after receiving a SIGINT.
+
+h. Fixed a bug that caused command word completion to fail if the directory in
+ $PATH where the completion would be found contained single or double quotes.
+
+i. Fixed a bug that caused a shell with -v enabled to print commands in $()
+ multiple times.
+
+2. Changes to Readline
+
+a. Fixed a bug that caused `undo' to reference freed memory or null pointers.
+
+3. New Features in Bash
+
+a. The [[ -v ]] option now understands array references (foo[1]) and returns
+ success if the referenced element has a value.
+
+------------------------------------------------------------------------------
+This document details the changes between this version, bash-4.3-rc2, and the
+previous version, bash-4.3-rc1.
+
+1. Changes to Bash
+
+a. Fixed a bug that left variables set by printf -v marked as invisible.
+
+b. Fixed an off-by-one error in a job control warning message.
+
+c. Fixed a bug that caused the shell to crash after declaring a nameref variable
+ without a value.
+
+d. Fixed a bug that caused asynchronous commands to not set $? correctly.
+
+e. Fixed a bug that caused out-of-order execution when executing aliases with
+ embedded newlines containing `.' commands.
+
+f. Fixed a bug that caused error messages generated by expansion errors in
+ `for' commands to have the wrong line number.
+
+g. Fixed a bug that caused the `wait' builtin to not be interruptible in an
+ interactive shell with job control enabled.
+
+h. Fixed a bug that caused SIGINT and SIGQUIT to not be trappable in
+ asynchronous subshell commands.
+
+i. Bash now requires that the value assigned to a nameref variable be a valid
+ shell identifier (variable name or array reference).
+
+j. Converting an existing variable to a nameref variable now turns off the
+ -i/-l/-u/-c attributes.
+
+k. Displaying a nameref variable with `declare -p' now displays the nameref
+ variable and its value rather than following the nameref chain.
+
+l. Fixed a problem with interrupt handling that caused a second and subsequent
+ SIGINT to be ignored by interactive shells.
+
+m. Fixed a bug that caused certain positional parameter and array expansions
+ to mishandle (discard) null positional parameters and array elements.
+
+n. The shell no longer blocks receipt of signals while running trap handlers
+ for those signals, and allows most trap handlers to be run recursively
+ (running trap handlers while a trap handler is executing).
+
+o. The shell now handles backslashes in regular expression arguments to the
+ [[ command's =~ operator slightly differently, resulting in more
+ consistent behavior.
+
+2. Changes to Readline
+
+a. Fixed a bug that could cause readline to crash and seg fault attempting to
+ expand an empty history entry.
+
+b. Fixed a bug that caused a bad entry in the $LS_COLORS variable to abort all
+ color processing but leave color enabled.
+
+c. Fixed a bug that caused display problems with multi-line prompts containing
+ invisible characters on multiple lines.
+
+d. Fixed a bug that caused effects made by undoing changes to a history line to
+ be discarded.
+
+3. New Features in Bash
+
+4. New Features in Readline
+
+a. When creating shared libraries on Mac OS X, the pathname written into the
+ library (install_name) no longer includes the minor version number.
+------------------------------------------------------------------------------
+This document details the changes between this version, bash-4.3-rc1, and the
+previous version, bash-4.3-beta2.
+
+1. Changes to Bash
+
+a. Fixed a bug in bash completion that caused a tilde to be expanded even if
+ the `direxpand' option was not enabled.
+
+b. Fixed a potential bug that could cause corrupted input in interactive shells
+ running without line editing and with `ignoreeof' enabled.
+
+c. Fixed a bug that could cause failures when opening pipes back to shells
+ created to run process substitutions.
+
+d. Fixed a bug that caused an assignment to TEXTDOMAIN to require TEXTDOMAINDIR
+ to be set in order to actually change the current text domain.
+
+e. Changed the way redirections are printed to avoid confusion when the target
+ of an output redirection is a process substitution beginning with `>'.
+
+2. Changes to Readline
+
+a. Shared library building is now supported on Mac OS X 10.9 (Darwin 13).
+
+3. New Features in Bash
+
+a. `cd' has a new `-@' option to browse a file's extended attributes on
+ systems that support O_XATTR.
+
+4. New Features in Readline
+
+a. There are additional default key bindings for MinGW32
+
+------------------------------------------------------------------------------
+This document details the changes between this version, bash-4.3-beta2, and the
+previous version, bash-4.3-beta.
+
+1. Changes to Bash
+
+a. Fixed a bug that caused assignment to an unset variable using a negative
+ subscript to result in a segmentation fault.
+
+b. Fixed a bug that caused assignment to a string variable using a negative
+ subscript to use the incorrect index.
+
+c. Fixed a bug that caused some strings to be interpreted as invalid
+ extended globbing expressions when used with the help builtin.
+
+d. Fixed a bug that caused an attempt to trap a signal whose disposition
+ cannot be changed to reference uninitialized memory.
+
+e. Command completion now skips assignment statements preceding a command
+ name and completes the command.
+
+f. Fixed a bug that caused `compgen -f' in a non-interactive shell to dump
+ core under certain circumstances.
+
+g. Fixed a bug that caused the `read -N' to misbehave when the input stream
+ contains 0xff.
+
+2. Changes to Readline
+
+a. Changed message when an incremental search fails to include "failed" in
+ the prompt and display the entire search string instead of just the last
+ matching portion.
+
+b. Fixed a bug that caused an arrow key typed to an incremental search prompt
+ to process the key sequence incorrectly.
+
+c. Additional key bindings for arrow keys on MinGW.
+
+3. New Features in Bash
+
+a. The help builtin now attempts substring matching (as it did through
+ bash-4.2) if exact string matching fails.
+
+b. The fc builtin now interprets -0 as the current command line.
+
+c. Completing directory names containing shell variables now adds a trailing
+ slash if the expanded result is a directory.
+
+4. New Features in Readline
+
+a. rl_change_environment: new application-settable variable that controls
+ whether or not Readline modifies the environment (currently readline
+ modifies only LINES and COLUMNS).
+
+------------------------------------------------------------------------------
+This document details the changes between this version, bash-4.3-beta, and the
+previous version, bash-4.3-alpha.
+
+1. Changes to Bash
+
+a. Fixed a bug in the prompt directory name "trimming" code that caused
+ memory corruption and garbled the results.
+
+b. Fixed a bug that caused single quotes that resulted from $'...' quoting
+ in the replacement portion of a double-quoted ${word/pat/rep} expansion
+ to be treated as quote characters.
+
+c. Fixed a bug that caused assignment statements preceding a command word to
+ result in assignment statements following a declaration command to not be
+ expanded like assignment statements.
+
+d. Fixed a bug with variable search order in the presence of local variables
+ with the same name as variables in the temporary environment supplied to
+ a shell function.
+
+e. Fixed a bug that caused constructs like 1<(2) to be interpreted as process
+ substitutions even in an arithmetic context.
+
+f. Fixed several cases where `invisible' variables (variables with attributes
+ but no values, which are technically unset) were treated incorrectly.
+
+g. Fixed a bug that caused group commands in pipelines that were not the
+ last element to not run the EXIT trap.
+
+h. Fixed a bug that caused `unset -n' to not unset a nameref variable in
+ certain cases.
+
+i. Fixed the nameref circular reference checking to be less strict and only
+ disallow a nameref variable with the same value as its name at the global
+ scope.
+
+j. Fixed a bug that caused trap handlers to be executed recursively,
+ corrupting internal data structures.
+
+k. Fixed a bug that could result in bash not compiling if certain options were
+ not enabled.
+
+l. Fixed a bug that caused the arithmetic expansion code to attempt variable
+ assignments when operator precedence prohibited them.
+
+m. Word expansions like ${foo##bar} now understand indirect variable references.
+
+n. Fixed a bug that caused `declare -fp name' to not display a function
+ definition.
+
+o. Fixed a bug that caused asynchronous child processes to modify the stdin
+ file pointer when bash was using it to read a script, which modified the
+ parent's value as well.
+
+2. Changes to Readline
+
+a. Fixed a bug in vi mode that caused the arrow keys to set the saved last
+ vi-mode command to the wrong value.
+
+b. Fixed a bug that caused double-quoted strings to be scanned incorrectly
+ when being used as the value of a readline variable assignment.
+
+c. Fixed a bug with vi mode that prevented `.' from repeating a command
+ entered on a previous line (command).
+
+d. Fixed a bug that could cause completion to core dump if it was interrupted
+ by a signal.
+
+e. Readline now sends the meta-key enable string to the terminal if the
+ terminal has been successfully initialized.
+
+f. Readline now calls the signal hook after resizing the terminal when it
+ receives a SIGWINCH.
+
+g. Fixed a bug that could cause the history list code to perform an out-of-
+ bounds array reference if the history list is empty.
+
+3. New Features in Bash
+
+a. Shells started to run process substitutions now run any trap set on EXIT.
+
+b. There is now a configure-time option to enable the globasciiranges option
+ by default.
+
+c. The read builtin now checks its first variable argument for validity before
+ trying to read any input.
+
+------------------------------------------------------------------------------
+This document details the changes between this version, bash-4.3-alpha,
+and the previous version, bash-4.2-release.
+
+1. Changes to Bash
+
+a. Fixed several bugs concerning incomplete bracket expressions in filename
+ generation (globbing) patterns.
+
+b. Fixed a bug with single quotes and WORD in ${param op WORD} when running
+ in Posix mode.
+
+c. Fixed a bug that caused the pattern removal and pattern substitution word
+ expansions and case statement word expansion to not match the empty string.
+
+d. Fixed a bug that caused the tzset() function to not work after changing
+ the TZ enviroment variable.
+
+e. Fixed a bug that caused the RHS of an assignment statement to undergo
+ word splitting when it contained an unquoted $@.
+
+f. Fixed bugs that caused the shell to not react to a SIGINT sent while
+ waiting for a child process to exit.
+
+g. Bash doesn't try to run things in a signal handler context when it gets a
+ signal (SIGINT/SIGHUP/etc) while reading input using readline but still
+ be responsive to terminating signals.
+
+h. Fixed a bug that caused bash to go into an infinite loop if a filename
+ to be matched contained an invalid multibyte character.
+
+i. Fixed a bug that caused PS4 to end up being truncated if it is longer
+ than 128 bytes.
+
+j. Fixed a bug that caused brace expansion to not skip over double-quoted
+ command substitution.
+
+k. System-specific updates for: DJGPP, HP/UX, Mac OS X
+
+l. Fixed a bug in displaying commands that caused redirections to be associated
+ with the wrong part of the command.
+
+m. Fixed the coproc cleanup to unset the appropriate shell variables when a
+ coproc terminates.
+
+n. Fixed a bug that caused `fc' to dump core due to incorrect calculation of
+ the last history entry.
+
+o. Added workarounds for FreeBSD's implementation of faccessat/eaccess and
+ `test -x'.
+
+p. Fixed a bug that caused the shell to not match patterns containing
+ control-A.
+
+q. Fixed a bug that could result in doubled error messages when the `printf'
+ builtin got a write error.
+
+r. Fixed a bug that caused the shell to not correctly expand words containing
+ multiple consecutive quoted empty strings (""""""aa).
+
+s. Fixed a bug that caused the shell to not correctly parse multi-line
+ process substitutions containing comments and quoted strings.
+
+t. Fixed a problem with the bash malloc's internal idea of the top of the
+ memory heap that resulted in incorrect decisions to try to reduce the
+ break and give memory back to the kernel.
+
+u. There are changes to the expansions peformed on compound array assignments,
+ in an effort to make foo=( [ind1]=bar [ind2]=baz ) identical to
+ foo[ind1]=bar foo[ind2]=baz.
+
+v. Bash now reports an error if `read -a name' is used when `name' is an
+ existing associative array.
+
+w. Fixed a bug that allowed an attempted assignment to a readonly variable
+ in an arithmetic expression to not return failure.
+
+x. Fixed several bugs that caused completion functions to be invoked even when
+ the cursor was before the first word in the command.
+
+y. Fixed a bug that caused parsing a command substitution to overwrite the
+ parsing state associated with the complete input line.
+
+z. Fixed several bugs with the built-in snprintf replacement and field widths
+ and floating point.
+
+aa. Fixed a bug that caused incorrect offset calculations and input buffer
+ corruption when reading files longer than 2^31 bytes.
+
+bb. Fixed several bugs where bash performed arithmetic evaluation in contexts
+ where evaluation is suppressed.
+
+cc. Fixed a bug that caused bash to close FIFOs used for process substitution
+ too early when a shell function was executing, but protect against using
+ all file descriptors when the shell functions are invoked inside loops.
+
+dd. Added checks for printable (and non-printable) multibyte characters for
+ use in error messages.
+
+ee. Fixed a bug that caused ^O (operate-and-get-next) to not work correctly
+ at the end of the history list.
+
+ff. Fixed a bug that caused command-oriented history to incorrectly combine
+ here documents into one line.
+
+gg. Fixed a bug that caused importing SHELLOPTS from the environment into a
+ Posix-mode shell to print an error message and refuse to parse it.
+
+hh. Fixed a bug that caused the shell to delete an extra history entry when
+ using `history -s'.
+
+ii. Fixed a bug that caused floating-point exceptions and overflow errors
+ for the / and % arithmetic operators when using INTMAX_MIN and -1.
+
+jj. Fixed a bug that caused parsing errors when reading an arithmetic for
+ loop inside a command substitution.
+
+kk. Fixed a bug that caused a readonly function to be unset when unset was
+ called without the -f or -v option.
+
+ll. Fixed several bugs in the code that quotes characters special to regular
+ expressions when used in a quoted string on the RHS of the =~ operator
+ to the [[ command.
+
+mm. Fixed a bug that caused redirections to fail because the file descriptor
+ limit was set to a value less than 10.
+
+nn. Fixed a bug that caused the `read' builtin to execute code in a signal
+ handler context if read timed out.
+
+oo. Fixed a bug that caused extended globbing patterns to not match files
+ beginning with `.' correctly when a `.' was explicitly supplied in the
+ pattern.
+
+pp. Fixed a bug that caused key sequences longer than two characters to not
+ work when used with `bind -x'.
+
+qq. Fixed a bug that resulted in redefined functions having the wrong source
+ file names in BASH_SOURCE.
+
+rr. Fixed a bug that caused the read builtin to assign null strings to variables
+ when using `read -N', which caused core dumps when referenced
+
+ss. Fixed a bug that caused `bash -m script' to not enable job control while
+ running the script.
+
+tt. Fixed a bug that caused `printf -v var' to dump core when used with the
+ %b format code.
+
+uu. Fixed a bug that caused the shell to exit with the wrong status if -e was
+ active and the shell exited on a substitution error.
+
+vv. Fixed a bug that caused the shell to seg fault if an array variable with
+ the same name as an existing associative array was implicitly created by
+ an assignment (declare a[n]=b).
+
+ww. Fixed a bug that caused a redirection to misbehave if the number specified
+ for a file descriptor overflows an intmax_t.
+
+xx. Fixed several bugs with the handling of valid and invalid unicode character
+ values when used with the \u and \U escape sequences to printf and $'...'.
+
+yy. Fixed a bug that caused tildes to not be escaped in expanded filenames,
+ making them subject to later expansion.
+
+zz. When using the pattern substitution word expansion, bash now runs the
+ replacement string through quote removal, since it allows quotes in that
+ string to act as escape characters. This is not backwards compatible, so
+ it can be disabled by setting the bash compatibility mode to 4.2.
+
+aaa. Fixed the rest of the cases where the shell runs non-allowed code in a
+ signal handler context.
+
+bbb. Fixed a bug that caused spurious DEL characters (\177) to appear in
+ double-quoted expansion where the RHS is evaluated to the empty string.
+
+ccc. Fixed a bug that caused the use of the shell's internal random number
+ generator for temporary file names to perturb the random number
+ sequence.
+
+ddd. Fixed several bugs that caused `declare -g' to not set the right global
+ variables or to misbehave when declaring global indexed arrays.
+
+eee. Fixed a logic bug that caused extended globbing in a multibyte locale to
+ cause failures when using the pattern substititution word expansions.
+
+fff. Fixed a bug that caused the `lastpipe' option to corrupt the file
+ descriptor used to read the script.
+
+ggg. Fixed a bug that causes the shell to delete DEL characters in the
+ expanded value of variables used in the same quoted string as variables
+ that expand to nothing.
+
+hhh. Fixed a bug that caused the shell to assign the wrong value from an
+ assignment like (( x=7 )) when `x' was an existing array variable.
+
+iii. Fixed a bug that caused the shell to misbehave when generating sequences
+ and the boundary values overflow an intmax_t.
+
+jjj. Fixed a bug caused expansion errors if an expansion of "$@" appeared
+ next to another expansion (e.g.. "${@}${x}").
+
+kkk. Fixed a potential buffer overflow bug when performing /dev/fd expansion.
+
+lll. Fixed a bug that resulted in an extra semicolon being added to compound
+ assignments when they were added to the history list.
+
+mmm. Fixed a bug that caused mapfile to read one extra line from the input.
+
+nnn. Fixed a bug that caused the mail checking code to use uninitialized
+ values.
+
+ooo. Fixed a bug that prevented history timestamps from being saved if the
+ history comment character is unset.
+
+ppp. Fixed a bug that caused the case-modifying expansions to not work with
+ multibyte characters.
+
+qqq. Fixed a bug that caused the edit-and-execute bindable readline command
+ to see the wrong data if invoked in the middle of a multi-line quoted
+ string.
+
+rrr. Fixed a bug that resulted in the shell returning the wrong exit status
+ for a background command on systems that recycle PIDs very quickly.
+
+sss. Fixed a bug that caused asynchronous group commands to not run any EXIT
+ trap defined in the body of the command.
+
+ttt. Fixed a bug that caused `eval "... ; return"' to not clean up properly.
+
+uuu. Fixed a bug that caused the shell to dump core if `read' reads an escaped
+ IFS whitespace character.
+
+vvv. Fixed a bug that caused BASH_COMMAND to be set to an incorrect value when
+ executing a (...) subshell.
+
+www. Fixed a couple of pointer aliasing bugs with the token string in arithmetic
+ evaluation.
+
+xxx. Fixed a bug with parsing multi-line command substitutions when reading
+ the `do' keyword followed by whitespace.
+
+yyy. Fixed a bug that caused the shell to seg fault if the time given to the
+ printf %(...)T format overflowed the value accepted by localtime(3).
+
+zzz. Fixed a problem with displaying help topics in two columns when the
+ translated text contained multibyte characters.
+
+aaaa. Fixed a bug with the extended globbing pattern matcher where a `*' was
+ followed by a negated extended glob pattern.
+
+bbbb. Fixed a race condition with short-lived coproc creation and reaping that
+ caused the child process to be reaped before the various coproc shell
+ variables were initialized.
+
+cccc. Fixed a bug where turning off `errexit' in command substitution subshells
+ was not reflected in $SHELLOPTS.
+
+dddd. Partially fixed an inconsistency in how the shell treated shell
+ functions run from an EXIT trap.
+
+eeee. Fixed a bug in how the shell invalidated FIFOs used for process
+ substitution when executing a pipeline (once rather than in every child).
+
+ffff. Fixed a bug that occurred when expanding a special variable ($@, $*)
+ within double quotes and the expansion resulted in an empty string.
+
+gggg. Fixed bugs with executing a SIGCHLD trap handler to make sure that it's
+ executed once per exited child.
+
+hhhh. Fixed a bug that caused `declare' and `test' to find variables that
+ had been given attributes but not assigned values. Such variables are
+ not set.
+
+iiii. Fixed a bug that caused commands in process substitutions to not look in
+ the local temporary environment when performing word expansions.
+
+jjjj. Fixed several problems with globstar expansions (**/**) returning null
+ filenames and multiple instances of the same pathname.
+
+kkkk. Fixed an oversight that did not allow the exit status of `coproc' to
+ be inverted using `!'.
+
+llll. Fixed a bug that caused the -e option to be re-enabled using `set -e'
+ even when executing in a context where -e is ignored.
+
+mmmm. Fixed a (mostly theoretical) bug with input lines longer than SIZE_MAX.
+
+nnnn. Fixed a bug that could result in double evaluation of command
+ substitutions when they appear in failed redirections.
+
+oooo. Fixed a bug that could cause seg faults during `mapfile' callbacks if
+ the callback unsets the array variable mapfile is using.
+
+pppp. Fixed several problems with variable assignments using ${var:=value}
+ when the variable assignment is supposed to have side effects.
+
+qqqq. Fixed a bug that caused a failure of an assignment statement preceding a
+ builtin caused the next invocation of a special builtin to exit the shell.
+
+rrrr. Fixed several problems with IFS when it appears in the temporary environment
+ and is used in redirections.
+
+ssss. Fixed a problem that caused IFS changes using ${IFS:=value} to modify
+ how preceding expansions were split.
+
+tttt. Fixed a problem that caused subshells to not run an EXIT trap they set.
+
+uuuu. Fixed a problem that caused shells started in posix mode to attempt to
+ import shell functions with invalid names from the environment. We now
+ print a warning.
+
+vvvv. Worked around a kernel problem that caused SIGCHLD to interrupt open(2)
+ on a FIFO used for process substitution, even if the SIGCHLD handler was
+ installed with the SA_RESTART flag.
+
+wwww. Fixed a problem that resulted in inconsistent expansion of $* and ${a[*]}.
+
+xxxx. Fixed a problem that caused `read -t' to crash when interrupted by
+ SIGINT.
+
+yyyy. Fixed a problem that caused pattern removal to fail randomly because the
+ pattern matcher read beyond the end of a string.
+
+zzzz. Fixed a bug that caused core dumps when shell functions tried to create
+ local shadow copies of special variables like GROUPS.
+
+aaaaa. Fixed a bug that caused SIGTERM to be occasionally lost by children of
+ interactive shells when it arrived before the child process reset the
+ handler from SIG_DFL.
+
+bbbbb. Fixed a bug that caused redirections like <&n- to leave file descriptor
+ n closed if executed with a builtin command.
+
+ccccc. Fixed a bug that caused incorrect completion quoting when completing a
+ word containing a globbing character with `show-all-if-ambiguous' set.
+
+ddddd. Fixed a bug that caused printf's %q format specifier not to quote a
+ tilde even if it appeared in a location where it would be subject to
+ tilde expansion.
+
+2. Changes to Readline
+
+a. Fixed a bug that did not allow the `dd', `cc', or `yy' vi editing mode
+ commands to work on the entire line.
+
+b. Fixed a bug that caused redisplay problems with prompts longer than 128
+ characters and history searches.
+
+c. Fixed a bug that caused readline to try and run code to modify its idea
+ of the screen size in a signal handler context upon receiving a SIGWINCH.
+
+d. Fixed a bug that caused the `meta' key to be enabled beyond the duration
+ of an individual call top readline().
+
+e. Added a workaround for a wcwidth bug in Mac OS X that caused readline's
+ redisplay to mishandle zero-width combining characters.
+
+f. Fixed a bug that caused readline to `forget' part of a key sequence when
+ a multiple-key sequence caused it to break out of an incremental search.
+
+g. Fixed bugs that caused readline to execute code in a signal handler
+ context if interrupted while reading from the file system during completion.
+
+h. Fixed a bug that caused readline to `forget' part of a key sequence when
+ reading an unbound multi-character key sequence.
+
+i. Fixed a bug that caused Readline's signal handlers to be installed beyond
+ the bounds of a single call to readline().
+
+j. Fixed a bug that caused the `.' command to not redo the most recent `R'
+ command in vi mode.
+
+k. Fixed a bug that caused ignoring case in completion matches to result in
+ readline using the wrong match.
+
+l. Paren matching now works in vi insert mode.
+
+m. Fix menu-completion to make show-all-if-ambiguous and menu-complete-display-prefix
+ work together.
+
+n. Fixed a bug that didn't allow the `cc', `dd', or `yy' commands to be redone
+ in vi editing mode.
+
+o. Fixed a bug that caused the filename comparison code to not compare
+ multibyte characters correctly when using case-sensitive or case-mapping
+ comparisons.
+
+p. Fixed the input reading loop to call the input hook function only when there
+ is no terminal input available.
+
+q. Fixed a bug that caused binding a macro to a multi-character key sequence
+ where the sequence and macro value share a common prefix to not perform
+ the macro replacement.
+
+r. Fixed several redisplay errors with multibyte characters and prompts
+ containing invisible characters when using horizontal scrolling.
+
+s. Fixed a bug that caused redisplay errors when trying to overwrite
+ existing characters using multibyte characters.
+
+3. New Features in Bash
+
+a. The `helptopic' completion action now maps to all the help topics, not just
+ the shell builtins.
+
+b. The `help' builtin no longer does prefix substring matching, so `help read'
+ does not match `readonly'.
+
+c. The shell can be compiled to not display a message about processes that
+ terminate due to SIGTERM.
+
+d. Non-interactive shells now react to the setting of checkwinsize and set
+ LINES and COLUMNS after a foreground job exits.
+
+e. There is a new shell option, `globasciiranges', which, when set to on,
+ forces globbing range comparisons to use character ordering as if they
+ were run in the C locale.
+
+f. There is a new shell option, `direxpand', which makes filename completion
+ expand variables in directory names in the way bash-4.1 did.
+
+g. In Posix mode, the `command' builtin does not change whether or not a
+ builtin it shadows is treated as an assignment builtin.
+
+h. The `return' and `exit' builtins accept negative exit status arguments.
+
+i. The word completion code checks whether or not a filename containing a
+ shell variable expands to a directory name and appends `/' to the word
+ as appropriate. The same code expands shell variables in command names
+ when performing command completion.
+
+j. In Posix mode, it is now an error to attempt to define a shell function
+ with the same name as a Posix special builtin.
+
+k. When compiled for strict Posix conformance, history expansion is disabled
+ by default.
+
+l. The history expansion character (!) does not cause history expansion when
+ followed by the closing quote in a double-quoted string.
+
+m. `complete' and its siblings compgen/compopt now takes a new `-o noquote'
+ option to inhibit quoting of the completions.
+
+n. Setting HISTSIZE to a value less than zero causes the history list to be
+ unlimited (setting it 0 zero disables the history list).
+
+o. Setting HISTFILESIZE to a value less than zero causes the history file size
+ to be unlimited (setting it to 0 causes the history file to be truncated
+ to zero size).
+
+p. The `read' builtin now skips NUL bytes in the input.
+
+q. There is a new `bind -X' option to print all key sequences bound to Unix
+ commands.
+
+r. When in Posix mode, `read' is interruptible by a trapped signal. After
+ running the trap handler, read returns 128+signal and throws away any
+ partially-read input.
+
+s. The command completion code skips whitespace and assignment statements
+ before looking for the command name word to be completed.
+
+t. The build process has a new mechanism for constructing separate help files
+ that better reflects the current set of compilation options.
+
+u. The -nt and -ot options to test now work with files with nanosecond
+ timestamp resolution.
+
+v. The shell saves the command history in any shell for which history is
+ enabled and HISTFILE is set, not just interactive shells.
+
+w. The shell has `nameref' variables and new -n(/+n) options to declare and
+ unset to use them, and a `test -R' option to test for them.
+
+x. The shell now allows assigning, referencing, and unsetting elements of
+ indexed arrays using negative subscripts (a[-1]=2, echo ${a[-1]}) which
+ count back from the last element of the array.
+
+y. The {x}<word redirection feature now allows words like {array[ind]} and
+ can use variables with special meanings to the shell (e.g., BASH_XTRACEFD).
+
+z. There is a new CHILD_MAX special shell variable; its value controls the
+ number of exited child statues the shell remembers.
+
+aa. There is a new configuration option (--enable-direxpand-default) that
+ causes the `direxpand' shell option to be enabled by default.
+
+bb. Bash does not do anything special to ensure that the file descriptor
+ assigned to X in {x}<foo remains open after the block containing it
+ completes.
+
+cc. The `wait' builtin has a new `-n' option to wait for the next child to
+ change status.
+
+dd. The `printf' %(...)T format specifier now uses the current time if no
+ argument is supplied.
+
+ee. There is a new variable, BASH_COMPAT, that controls the current shell
+ compatibility level.
+
+ff. The `popd' builtin now treats additional arguments as errors.
+
+gg. The brace expansion code now treats a failed sequence expansion as a
+ simple string and will continue to expand brace terms in the remainder
+ of the word.
+
+4. New Features in Readline
+
+a. Readline is now more responsive to SIGHUP and other fatal signals when
+ reading input from the terminal or performing word completion but no
+ longer attempts to run any not-allowable functions from a signal handler
+ context.
+
+b. There are new bindable commands to search the history for the string of
+ characters between the beginning of the line and the point
+ (history-substring-search-forward, history-substring-search-backward)
+
+c. Readline allows quoted strings as the values of variables when setting
+ them with `set'. As a side effect, trailing spaces and tabs are ignored
+ when setting a string variable's value.
+
+d. The history library creates a backup of the history file when writing it
+ and restores the backup on a write error.
+
+e. New application-settable variable: rl_filename_stat_hook: a function called
+ with a filename before using it in a call to stat(2). Bash uses it to
+ expand shell variables so things like $HOME/Downloads have a slash
+ appended.
+
+f. New bindable function `print-last-kbd-macro', prints the most-recently-
+ defined keyboard macro in a reusable format.
+
+g. New user-settable variable `colored-stats', enables use of colored text
+ to denote file types when displaying possible completions (colored analog
+ of visible-stats).
+
+h. New user-settable variable `keyseq-timout', acts as an inter-character
+ timeout when reading input or incremental search strings.
+
+i. New application-callable function: rl_clear_history. Clears the history list
+ and frees all readline-associated private data.
+
+j. New user-settable variable, show-mode-in-prompt, adds a characters to the
+ beginning of the prompt indicating the current editing mode.
+
+k. New application-settable variable: rl_input_available_hook; function to be
+ called when readline needs to check whether there is data available on its
+ input source. The default hook checks rl_instream.
+
+l. Readline calls an application-set event hook (rl_signal_event_hook) after
+ it gets a signal while reading input (read returns -1/EINTR but readline
+ does not handle the signal immediately) to allow the application to handle
+ or otherwise note it. Not currently called for SIGHUP or SIGTERM.
+
+m. If the user-settable variable `history-size' is set to a value less than
+ 0, the history list size is unlimited.
+
+------------------------------------------------------------------------------
This document details the changes between this version, bash-4.2-release,
and the previous version, bash-4.2-rc2.
projects / platform / upstream / bash.git / blobdiff