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This document details the changes between this version, bash-4.1-rc,
and the previous version, bash-4.1-beta.
1. Changes to Bash
a. Fixed a bug that caused printf to not return a partial value when it
encountered an error while converting an integer argument.
b. Fixed a bug that caused setting one of the compatNN options to not
turn off the others.
c. The (undocumented) --wordexp option is no longer included by default.
d. Fixed a bug in conditional command execution that caused it to not
correctly ignore the exit status under certain circumstances.
e. Added a configure-time check for correctly-working asprintf/snprintf.
f. Fixed some problems with line number calculation and display when sourcing
a file in an interactive shell.
g. Fixed a bug that caused the shell to crash when using `declare -A foo=bar'.
h. Fixed a bug that caused an off-by-one error when calculating the directories
to display with the PROMPT_DIRTRIM option.
2. Changes to Readline
a. Fixed a bug that caused applications using the callback interface to not
react to SIGINT (or other signals) until another character arrived.
------------------------------------------------------------------------------
This document details the changes between this version, bash-4.1-beta,
and the previous version, bash-4.1-alpha.
1. Changes to Bash
a. Fixed a bug in mapfile that caused the shell to crash if it was passed the
name of an associative array.
b. Fixed a bug that caused the shell to incorrectly split case patterns if
they contained characters in $IFS.
c. Fixed a bug that caused the shell to set $? to the wrong value when using
a construct ending with a variable assignment with set -x enabled and PS4
containing a command substitution.
d. Fixed a bug that caused the shell to read commands incorrectly if an
expansion error occurred under certain conditions in a user-specified
subshell.
e. Fixed a bug that caused the shell to set $? incorrectly if a parse error
occurred in an evaluation context ("eval", trap command, dot script, etc.)
f. Fixed a bug that caused the shell to attempt command substitution
completion within a single-quoted string.
g. Fixed a bug that caused the shell to insert an extra single quote during
word completion.
h. Fixed a bug that caused the shell to crash if invoked with the environment
variable EMACS having a null value.
i. Fixed a bug that caused bash to incorrectly report the presence of new
mail in a `maildir' environment.
j. Fixed a bug that caused the shell to not recognize a here-document ending
delimiter inside a command substitution.
k. Fixed a bug that caused the shell to crash when a a dynamic array variable
was assigned a scalar value.
2. Changes to Readline
3. New Features in Bash
a. The mapfile/readarray builtin no longer stores the commands it invokes via
callbacks in the history list.
b. There is a new `compat40' shopt option.
c. The < and > operators to [[ do string comparisons using the current locale
only if the compatibility level is greater than 40 (set to 41 by default).
4. New Features in Readline
------------------------------------------------------------------------------
This document details the changes between this version, bash-4.1-alpha,
and the previous version, bash-4.0-release.
1. Changes to Bash
a. Fixed bugs in the parser involving new parsing of the commands contained
in command substitution when the substitution is read.
b. Fixed a bug that caused the shell to dump core when performing programmable
completion using a shell function.
c. Fixed a bug in `mapfile' that caused it to invoke callbacks at the wrong
time.
d. Fixed a bug that caused the shell to dump core when listing jobs in the
`exit' builtin.
e. Fixed several bugs encountered when reading subscripts in associative
array assignments and expansions.
f. Fixed a bug that under some circumstances caused an associative array to
be converted to an indexed array.
g. Fixed a bug that caused syntax errors and SIGINT interrupts to not set
$? to a value > 128.
h. Fixed a bug that caused the shell to remove FIFOs associated with process
substitution inside shell functions.
i. Fixed a bug that caused terminal attributes to not be reset when the
`read' builtin timed out.
j. Fixed a bug in brace expansion that caused unwanted zero padding of the
expanded terms.
k. Fixed a bug that prevented the |& construct from working as intended when
used with a simple command with additional redirections.
l. Fixed a bug with the case statment ;& terminator that caused the shell to
dereference a NULL pointer.
m. Fixed a bug that caused assignment statements or redirections preceding
a simple command name to inhibit alias expansion.
n. Fixed the behavior of `set -u' to conform to the latest Posix interpretation:
every expansion of an unset variable except $@ and $* will cause the
shell to exit.
o. Fixed a bug that caused double-quoted expansions of $* inside word
expansions like ${x#$*} to not expand properly when $IFS is empty.
p. Fixed a bug that caused traps to set $LINENO to the wrong value when they
execute.
q. Fixed a bug that caused off-by-one errors when computing history lines in
the `fc' builtin.
r. Fixed a bug that caused some terminating signals to not exit the shell
quickly enough, forcing the kernel to send the signal (e.g., SIGSEGV)
multiple times.
s. Fixed a bug that caused the shell to attempt to add empty lines to the
history list when reading here documents.
t. Made some internal changes that dramatically speeds up sequential indexed
array access.
u. Fixed a bug that caused the shell to write past the end of a string when
completing a double-quoted string ending in a backslash.
v. Fixed a bug that caused the shell to replace too many characters when a
pattern match was null in a ${foo//bar} expansion.
w. Fixed bugs in the expansion of ** that caused duplicate directory names
and the contents of the current directory to be omitted.
x. Fixed a bug that caused $? to not be set correctly when referencing an
unset variable with set -u and set -e enabled.
y. Fixed a bug caused by executing an external program from the DEBUG trap
while a pipeline was running. The effect was to disturb the pipeline
state, occasionally causing it to hang.
z. Fixed a bug that caused the ** glob expansion to dump core if it
encountered an unsearchable directory.
aa. Fixed a bug that caused `command -v' and `command -V' to not honor the
path set by the -p option.
bb. Fixed a bug that caused brace expansion to take place too soon in some
compound array assignments.
cc. Fixed a bug that caused programmable completion functions' changes to
READLINE_POINT to not be reflected back to readline.
dd. Fixed a bug that caused the shell to dump core if a trap was executed
during a shell assignment statement.
ee. Fixed an off-by-one error when computing the number of positional
parameters for the ${@:0:n} expansion.
ff. Fixed a problem with setting COMP_CWORD for programmable completion
functions that could leave it set to -1.
gg. Fixed a bug that caused the ERR trap to be triggered in some cases where
`set -e' would not have caused the shell to exit.
hh. Fixed a bug that caused changes made by `compopt' to not persist past the
completion function in which compopt was executed.
ii. Fixed a bug that caused the list of hostname completions to not be cleared
when HOSTNAME was unset.
jj. Fixed a bug that caused variable expansion in here documents to look in
any temporary environment.
kk. Bash and readline can now convert file names between precomposed and
decomposed Unicode on Mac OS X ("keyboard" and file system forms,
respectively). This affects filename completion (using new
rl_filename_rewrite_hook), globbing, and readline redisplay.
ll. The ERR and EXIT traps now see a non-zero value for $? when a parser
error after set -e has been enabled causes the shell to exit.
mm. Fixed a bug that in brace expansion that caused zero-prefixed terms to
not contain the correct number of digits.
nn. Fixed a bug that caused the shell to free non-allocated memory when
unsetting an associative array which had had a value implicitly assigned
to index "0".
oo. Fixed a memory leak in the ${!prefix@} expansion.
pp. Fixed a bug that caused printf to not correctly report all write errors.
qq. Fixed a bug that caused single and double quotes to act as delimiters
when splitting a command line into words for programmable completion.
rr. Fixed a bug that caused ** globbing that caused **/path/* to match every
directory, not just those matching `path'.
ss. Fixed a bug that caused the shell to dump core when running `help' without
arguments if the terminal width was fewer than 7 characters.
2. Changes to Readline
a. The SIGWINCH signal handler now avoids calling the redisplay code if
one arrives while in the middle of redisplay.
b. Changes to the timeout code to make sure that timeout values greater
than one second are handled better.
c. Fixed a bug in the redisplay code that was triggered by a prompt
containing invisible characters exactly the width of the screen.
d. Fixed a bug in the redisplay code encountered when running in horizontal
scroll mode.
e. Fixed a bug that prevented menu completion from properly completing
filenames.
f. Fixed a redisplay bug caused by a multibyte character causing a line to
wrap.
g. Fixed a bug that caused key sequences of two characters to not be
recognized when a longer sequence identical in the first two characters
was bound.
h. Fixed a bug that caused history expansion to be attempted on $'...'
single-quoted strings.
i. Fixed a bug that caused incorrect redisplay when the prompt contained
multibyte characters in an `invisible' sequence bracketed by \[ and
\].
j. Fixed a bug that caused history expansion to short-circuit after
encountering a multibyte character.
3. New Features in Bash
a. Here-documents within $(...) command substitutions may once more be
delimited by the closing right paren, instead of requiring a newline.
b. Bash's file status checks (executable, readable, etc.) now take file
system ACLs into account on file systems that support them.
c. Bash now passes environment variables with names that are not valid
shell variable names through into the environment passed to child
processes.
d. The `execute-unix-command' readline function now attempts to clear and
reuse the current line rather than move to a new one after the command
executes.
e. `printf -v' can now assign values to array indices.
f. New `complete -E' and `compopt -E' options that work on the "empty"
completion: completion attempted on an empty command line.
g. New complete/compgen/compopt -D option to define a `default' completion:
a completion to be invoked on command for which no completion has been
defined. If this function returns 124, programmable completion is
attempted again, allowing a user to dynamically build a set of completions
as completion is attempted by having the default completion function
install individual completion functions each time it is invoked.
h. When displaying associative arrays, subscripts are now quoted.
i. Changes to dabbrev-expand to make it more `emacs-like': no space appended
after matches, completions are not sorted, and most recent history entries
are presented first.
j. The [[ and (( commands are now subject to the setting of `set -e' and the
ERR trap.
k. The source/. builtin now removes NUL bytes from the file before attempting
to parse commands.
l. There is a new configuration option (in config-top.h) that forces bash to
forward all history entries to syslog.
m. A new variable $BASHOPTS to export shell options settable using `shopt' to
child processes.
n. There is a new confgure option that forces the extglob option to be
enabled by default.
o. New variable $BASH_XTRACEFD; when set to an integer bash will write xtrace
output to that file descriptor.
p. If the optional left-hand-side of a redirection is of the form {var}, the
shell assigns the file descriptor used to $var or uses $var as the file
descriptor to move or close, depending on the redirection operator.
q. The < and > operators to the [[ conditional command now do string
comparison according to the current locale.
r. Programmable completion now uses the completion for `b' instead of `a'
when completion is attempted on a line like: a $(b c.
s. Force extglob on temporarily when parsing the pattern argument to
the == and != operators to the [[ command, for compatibility.
t. Changed the behavior of interrupting the wait builtin when a SIGCHLD is
received and a trap on SIGCHLD is set to be Posix-mode only.
u. The read builtin has a new `-N nchars' option, which reads exactly NCHARS
characters, ignoring delimiters like newline.
4. New Features in Readline
a. New bindable function: menu-complete-backward.
b. In the vi insertion keymap, C-n is now bound to menu-complete by default,
and C-p to menu-complete-backward.
c. When in vi command mode, repeatedly hitting ESC now does nothing, even
when ESC introduces a bound key sequence. This is closer to how
historical vi behaves.
d. New bindable function: skip-csi-sequence. Can be used as a default to
consume key sequences generated by keys like Home and End without having
to bind all keys.
e. New application-settable function: rl_filename_rewrite_hook. Can be used
to rewite or modify filenames read from the file system before they are
compared to the word to be completed.
f. New bindable variable: skip-completed-text, active when completing in the
middle of a word. If enabled, it means that characters in the completion
that match characters in the remainder of the word are "skipped" rather
than inserted into the line.
g. The pre-readline-6.0 version of menu completion is available as
"old-menu-complete" for users who do not like the readline-6.0 version.
h. New bindable variable: echo-control-characters. If enabled, and the
tty ECHOCTL bit is set, controls the echoing of characters corresponding
to keyboard-generated signals.
i. New bindable variable: enable-meta-key. Controls whether or not readline
sends the smm/rmm sequences if the terminal indicates it has a meta key
that enables eight-bit characters.
------------------------------------------------------------------------------
This document details the changes between this version, bash-4.0-release,
and the previous version, bash-4.0-rc1.
1. Changes to Bash
a. Changed the message printed when setlocale(3) fails to only include the
strerror error text if the call changes errno.
b. Changed trap command execution to reset the line number before running a
trap (except DEBUG and RETURN traps).
c. Fixed behavior of case-modifiying word expansions to not work on
individual words within a variable's value.
d. Fixed a bug that caused mapfile to not be interruptible when run in an
interactive shell.
e. Fixed a bug that caused mapfile to not run callbacks for the first line
read.
f. Fixed a bug that caused mapfile to not honor EOF typed in an interactive
shell.
g. Fixed the coprocess reaping code to not run straight from a signal handler.
h. Fixed a bug that caused printf -b to ignore the first % conversion specifier
in the format string on 64-bit systems.
i. Fixed a bug that caused incorrect word splitting when `:', `=', or `~'
appeared in $IFS.
j. Fixed a bug that caused data corruption in the programmable completion code
when a shell function called from a completion aborted execution.
k. Fixed a bug that caused the CPU usage reported by the `time' builtin to be
capped at 100%.
l. Changed behavior of shell when -e option is in effect to reflect consensus
of Posix shell standardization working group.
m. Fixed a bug introduced in bash-4.0-alpha that caused redirections to not
be displayed by `type' or `declare' when appearing in functions under
certain circumstances.
2. Changes to Readline
a. Fixed a bug that caused !(...) extended glob patterns to inhibit later
history expansion.
b. Reworked the signal handling to avoid calling disallowed functions from a
signal handler.
3. New Features in Bash
a. `readarray' is now a synonym for `mapfile'.
------------------------------------------------------------------------------
This document details the changes between this version, bash-4.0-rc1,
and the previous version, bash-4.0-beta2.
1. Changes to Bash
a. Fixed a bug that caused parsing errors when a $()-style command
substitution was follwed immediately by a quoted newline.
b. Fixed a bug that caused extended shell globbing patterns beginning with
`*(' to not work when used with pattern substitution word expansions.
------------------------------------------------------------------------------
This document details the changes between this version, bash-4.0-beta2,
and the previous version, bash-4.0-beta.
1. Changes to Bash
a. Fixed a bug that caused failed word expansions to set $? but not
PIPESTATUS.
b. Changed filename completion to quote the tilde in a filename with a
leading tilde that exists in the current directory.
c. Fixed a bug that caused a file descriptor leak when performing
redirections attached to a compound command.
d. Fixed a bug that caused expansions of $@ and $* to not exit the shell if
the -u option was enabled and there were no posititional parameters.
e. Fixed a bug that resulted in bash not terminating immediately if a
terminating signal was received while performing output.
f. Fixed a bug that caused the shell to crash after creating 256 process
substitutions during word completion.
2. Changes to Readline
a. Fixed a bug that caused redisplay errors when using prompts with invisible
characters and numeric arguments to a command in a multibyte locale.
b. Fixed a bug that caused redisplay errors when using prompts with invisible
characters spanning more than two physical screen lines.
------------------------------------------------------------------------------
This document details the changes between this version, bash-4.0-beta,
and the previous version, bash-4.0-alpha.
1. Changes to Bash
a. Fixed a typo that caused a variable to be used before initialization
while parsing Posix-style command substitutions.
b. Fixed a bug that caused stray ^? when the expansion of a parameter used
as part of a pattern removal expansion is empty, but part of a non-
empty string.
c. Fixed a bug that could cause strings not converted to numbers by strtol
to be treated as if the conversion had been successful.
d. The `return' builtin now accepts no options and requires a `--' before
a negative return value, as Posix requires.
e. Fixed a bug that caused local variables to be created with the empty
string for a value rather than no value.
f. Changed behavior so the shell now acts as if it received an interrupt
when a pipeline is killed by SIGINT while executing a list.
g. Fixed a bug that caused `declare var' and `typeset var' to initialize
`var' to the empty string.
h. Changed `bind' builtin to print a warning but proceed if invoked when
line editing is not active.
i. Fixed a bug that caused the shell to exit when the `errexit' option is
set and a command in a pipeline returns a non-zero exit status.
j. Fixed a bug that caused the shell to not run the exit trap in a command
run with `bash -c' under some circumstances.
k. Fixed a bug that caused parser errors to occasionally not set $? when
running commands with `eval'.
l. Fixed a bug that caused stray control characters when evaluating compound
array assignments containing $'\x7f' escapes.
m. Fixed a bug that caused redirections involving file descriptor 10 as the
target to behave incorrectly.
n. Fixed a bug that could cause memory to be freed multiple times when
assigning to COMP_WORDBREAKS.
o. Fixed a bug that could cause NULL pointer dereferences when COMP_WORDBREAKS
was unset.
2. Changes to Readline
3. New Features in Bash
a. A value of 0 for the -t option to `read' now returns success if there is
input available to be read from the specified file descriptor.
b. CDPATH and GLOBIGNORE are ignored when the shell is running in privileged
mode.
c. New bindable readline functions shell-forward-word and shell-backward-word,
which move forward and backward words delimited by shell metacharacters
and honor shell quoting.
d. New bindable readline functions shell-backward-kill-word and shell-kill-word
which kill words backward and forward, but use the same word boundaries
as shell-forward-word and shell-backward-word.
4. New Features in Readline
a. If the kernel supports it, readline displays special characters
corresponding to a keyboard-generated signal when the signal is received.
------------------------------------------------------------------------------
This document details the changes between this version, bash-4.0-alpha,
and the previous version, bash-3.2-release.
1. Changes to Bash
a. Fixed several bugs in old-style `` command substitution parsing, including
comment parsing and quoted string handling.
b. Fixed problems parsing arguments to the [[ command's =~ regular expression
matching operator: metacharacter and whitespace parsing.
c. Fixed a bug that caused the shell to inappropriately reuse high-numbered
file descriptors it used internally.
d. Fixed a bug in pattern replacement word expansions that caused a `/' as
the first character of an expanded pattern to be mistaken for a global
replacement specifier.
e. Fixed several problems with the asprintf and snprintf replacement functions
that caused hangs and crashes.
f. Fixed a bug in the calculation of the current and previous job that caused
it to refer to incorrect jobs.
g. Fixed a bug in the check for the validity of a hashed command pathname that
caused unnecessary hash table deletions and additions.
h. Fixed a bug that caused child processes to inherit the wrong value for $!.
i. Fixed a bug that caused `.' to fail to read and execute commands from non-
regular files such as devices or named pipes.
j. Fixed a bug in printf formatting for the %x and %X expansions that occurred
on some systems.
k. Fixed a bug that caused the shell to crash when creating temporary files if
$TMPDIR named a non-writable directory.
l. Fixed a bug that caused the shell to ignore $TMPDIR when creating temporary
files under some circumstances.
m. Fixed a bug that caused named pipes created by process substitution to not
be cleaned up.
n. Fixed a bug that caused HISTTIMEFORMAT to not be honored when it appeared
in the initial shell environment.
o. Fixed several bugs in the expansion of $* and $@ (quoted and unquoted)
when IFS is null or contains non-whitespace characters; the same changes
apply to arrays subscripted with * or @.
p. Fixed several problems with pattern substitution expansions on the
positional parameters and arrays subscripted with * or @ that occurred
when $IFS was set to the empty string.
q. Made a change to the default locale initialization code that should
result in better behavior from the locale-aware library functions.
r. Fixed a bug that caused compacting the jobs list to drop jobs.
s. Fixed a bug that caused jumps back to the top-level processing loop from
a builtin command to leave the shell in an inconsistent state.
t. Fixed a bug that caused characters that would be escaped internally to be
doubled when escaped with a backslash.
u. Fixed the initialization of mailboxes to not cause maildirs to be read
(and stat(2) called for every message file) at shell startup.
v. Fixed a bug that caused the shell to not display $PS2 when the read builtin
reads a line continued with a backslash.
w. Fixed a bug that caused errors in word splitting when $IFS contained
characters used for internal quoting.
x. Fixed bugs that caused problems with output from shell builtins not being
completely displayed on some systems.
y. Fixed a bug that caused output to be lost when a redirection is acting on
the shell's output file descriptor.
z. Fixed bugs caused by shell builtins not checking for all write errors.
aa. Fixed a problem that caused the shell to dump core if expansions on the
pattern passed to the pattern removal word expansions resulted in expansion
errors.
bb. Fixed a bug that caused bash to loop infinitely after creating and
waiting for 4096 jobs.
cc. Fixed a bug that caused bash to lose the status of a background job under
certain circumstances.
dd. Fixed a bug that caused bash to not look in the temporary environment
when performing variable lookup under certain circumstances.
ee. Fixed a bug that caused bash to close file descriptors greater than 10
when they were used in redirections.
ff. Fixed a problem that caused the shell to attempt to read from the standard
input when called as `bash -i script'.
gg. Fixed a memory leak and variable initialization problems when the -v option
was supplied to `printf' that could cause incorrect results.
hh. Fixed a bug that caused the `read' builtin to count bytes when the -n option
was supplied, rather than (possibly multibyte) characters.
ii. Fixed a bug when displaying a function due to not converting the function
to an external form.
jj. Changed job control initialization to ensure that the shell has a tty
as its controlling terminal before enabling job control.
kk. Fixed a bug with the `test' builtin that caused it to misinterpret
arguments beginning with `-' but containing more than one character.
ll. Fixed bug that could cause the shell to dump core in certain cases where
a command sets the SIGINT disposition to the default.
mm. Fixed a bug in the pattern replacement (affecting both word expansion
and the `fc' builtin) that occurred when the pattern and replacement
strings were empty.
nn. Fixed a bug that caused an arithmetic evaluation error to disable all
further evaluation.
oo. Fixed a bug in pathname expansion that caused it to interpret backslashes
in the pathname as quoting characters.
pp. Fixed a bug in the replacement getcwd() implementation that could cause
memory to be overwritten.
qq. When in Posix mode, the `ulimit' builtin now uses a block size of 512 for
the `-c' and `-f' options.
rr. Brace expansion now allows process substitutions to pass through unchanged.
ss. Fixed a problem in the command name completion code to avoid quoting
escaped special characters twice when the command name begins with a tilde.
tt. Fixed a problem in the printf builtin that resulted in single-byte
output for the "'" escape, even when using multibyte characters.
uu. Fixed a bug that caused the failure exit status to be lost when redirections
attached to a compound command failed.
vv. Fixed a bug that caused the internal random number generator to not be
re-seeded correctly when creating a subshell.
ww. Fixed a bug that could cause the bash replacement getcwd to overwrite
memory.
xx. Fixed a bug that caused the shell to not receive SIGINT if it was sent
while the shell was waiting for a command substitution to terminate, and
make sure the exit status is correct when it does.
yy. Fixed a bug that resulted in the second and subsequent children spawned
by a shell begun to run a command substitution being placed into the
wrong process group.
zz. Fixed a bug that caused the results of successful tilde expansion to be
subject to pathname expansion and word splitting.
aaa. Fixed a bug that could cause the shell to hang if it encountered an
error that caused it to jump back to the top processing loop during a
command substitution or `eval' command.
bbb. Fixed a bug that caused the `read' builtin to use the tty's attributes
instead of those of the file descriptor passed with the -u option when
processing the -n and -d options.
ccc. Fixed a bug that caused incorrect expansion of ${array[@]:foo} if the
first character of $IFS was not whitespace.
ddd. Fixed a bug that occurred when scanning for the ending delimiter of a
${parameter/pat/sub} expansion.
eee. Fixed a bug that caused the shell to inappropriately expand command
substitutions in words when expanding directory names for completion.
fff. Fixed a bug that caused the `fc' builtin to look too far back in the
history list under certain circumstances.
ggg. Fixed a bug that caused a shell running in Posix mode to search $PWD for
a file specified as an argument to source/. when the file was not found
in $PATH.
hhh. Fixed a bug that caused the shell to modify the case of a command word
found via command completion when the shell was performing case-
insensitive completion.
iii. Fixed a bug that caused the shell to search $PATH for an argument to
source/. even when it contained a `/'.
jjj. Fixed a bug that caused brace expansion to misorder expansions when the
locale did not have a collating order like aAbBcC...zZ.
kkk. Fixed a bug that did not allow `set +o history' to have any effect when
run in a startup file or from a sourced file.
lll. Fixed a bug with the precedence of the ?: conditional arithmetic operator.
mmm. Fixed a bug that caused side effects of temporary variable assignments
to persist in the shell environment.
nnn. Fixed a bug that caused the terminal to be left in non-canonical mode
when using editing commands that invoke the an editor on the current
command line.
ooo. Fixed a bug that caused globbing characters and characters in $IFS to not
be quoted appropriately when displaying assignment statements.
ppp. Fixed a bug that caused the `-e' option to be inherited when sourcing a
file or evaluating a command with `eval' even if the return value of the
command was supposed to be ignored.
qqq. Fixed a bug that caused the shell to attempt to created variables with
invalid names if such names appeared in the initial environment.
rrr. Fixed a bug with quote removal in strings where the final character is a
backslash.
sss. Fixed a bug that caused the effects of special variables to persist even
when the variables were unset as part of the shell reinitializing itself
to execute a shell script.
ttt. Fixed a bug that caused the history to not be saved after `history -c' or
`history -d' was executed until a sufficient number of commands had been
saved to the history.
uuu. Bash now parses command substitutions according to Posix rules: parsing
the command contained in $() to find the closing delimiter.
vvv. Fixed a bug that caused traps on SIGCHLD set in a SIGCHLD handler to
not persist.
www. Fixed a bug that didn't allow SIGCHLD to interrupt the `wait' builtin
as Posix specifies.
xxx. Invalid numeric arguments to shell builtins no longer cause the shell to
short-circuit any executing compound command.
yyy. Fixed a bug that caused the exit status to be lost when `break' was
used to short-circuit a loop's execution.
zzz. Fixed a bug that caused stray ^? characters to be left in expansions of
"${array[*]}".
aaaa. Bash now prints better error messages for here documents terminated by
EOF and for identifying the incorrect token in an invalid arithmetic
expression.
bbbb. Fixed a bug in the variable length word expansion that caused it to
incorrectly calculate the number of multibyte characters.
cccc. Fixed a race condition that could result in the top-level shell setting
the terminal's process group to an incorrect value if the process
group was changed by a child of a child of the shell.
dddd. Fixed a bug that caused here documents belonging to commands within a
compound command to be displayed in a syntactially-incorrect form, which
prevented them from being re-read as input.
eeee. The shell displays more warnings about failures to set the locale.
ffff. Fixed a bug that caused the body of a here-document to not be saved to
the history list.
gggg. Fixed a bug that caused configure to incorrectly conclude that FreeBSD
had /dev/fd available, resulting in problems with process substitution.
2. Changes to Readline
a. Fixed a number of redisplay errors in environments supporting multibyte
characters.
b. Fixed bugs in vi command mode that caused motion commands to inappropriately
set the mark.
c. When using the arrow keys in vi insertion mode, readline allows movement
beyond the current end of the line (unlike command mode).
d. Fixed bugs that caused readline to loop when the terminal has been taken
away and reads return -1/EIO.
e. Fixed bugs in redisplay occurring when displaying prompts containing
invisible characters.
f. Fixed a bug that caused the completion append character to not be reset to
the default after an application-specified completion function changed it.
g. Fixed a problem that caused incorrect positioning of the cursor while in
emacs editing mode when moving forward at the end of a line while using
a locale supporting multibyte characters.
h. Fixed an off-by-one error that caused readline to drop every 511th
character of buffered input.
i. Fixed a bug that resulted in SIGTERM not being caught or cleaned up.
j. Fixed redisplay bugs caused by multiline prompts with invisible characters
or no characters following the final newline.
k. Fixed redisplay bug caused by prompts consisting solely of invisible
characters.
l. Fixed a bug in the code that buffers characters received very quickly in
succession which caused characters to be dropped.
m. Fixed a bug that caused readline to reference uninitialized data structures
if it received a SIGWINCH before completing initialzation.
n. Fixed a bug that caused the vi-mode `last command' to be set incorrectly
and therefore unrepeatable.
o. Fixed a bug that caused readline to disable echoing when it was being used
with an output file descriptor that was not a terminal.
p. Readline now blocks SIGINT while manipulating internal data structures
during redisplay.
q. Fixed a bug in redisplay that caused readline to segfault when pasting a
very long line (over 130,000 characters).
r. Fixed bugs in redisplay when using prompts with no visible printing
characters.
3. New Features in Bash
a. When using substring expansion on the positional parameters, a starting
index of 0 now causes $0 to be prefixed to the list.
b. The `help' builtin now prints its columns with entries sorted vertically
rather than horizontally.
c. There is a new variable, $BASHPID, which always returns the process id of
the current shell.
d. There is a new `autocd' option that, when enabled, causes bash to attempt
to `cd' to a directory name that is supplied as the first word of a
simple command.
e. There is a new `checkjobs' option that causes the shell to check for and
report any running or stopped jobs at exit.
f. The programmable completion code exports a new COMP_TYPE variable, set to
a character describing the type of completion being attempted.
g. The programmable completion code exports a new COMP_KEY variable, set to
the character that caused the completion to be invoked (e.g., TAB).
h. If creation of a child process fails due to insufficient resources, bash
will try again several times before reporting failure.
i. The programmable completion code now uses the same set of characters as
readline when breaking the command line into a list of words.
j. The block multiplier for the ulimit -c and -f options is now 512 when in
Posix mode, as Posix specifies.
k. Changed the behavior of the read builtin to save any partial input received
in the specified variable when the read builtin times out. This also
results in variables specified as arguments to read to be set to the empty
string when there is no input available. When the read builtin times out,
it returns an exit status greater than 128.
l. The shell now has the notion of a `compatibility level', controlled by
new variables settable by `shopt'. Setting this variable currently
restores the bash-3.1 behavior when processing quoted strings on the rhs
of the `=~' operator to the `[[' command.
m. The `ulimit' builtin now has new -b (socket buffer size) and -T (number
of threads) options.
n. The -p option to `declare' now displays all variable values and attributes
(or function values and attributes if used with -f).
o. There is a new `compopt' builtin that allows completion functions to modify
completion options for existing completions or the completion currently
being executed.
p. The `read' builtin has a new -i option which inserts text into the reply
buffer when using readline.
q. A new `-E' option to the complete builtin allows control of the default
behavior for completion on an empty line.
r. There is now limited support for completing command name words containing
globbing characters.
s. Changed format of internal help documentation for all builtins to roughly
follow man page format.
t. The `help' builtin now has a new -d option, to display a short description,
and a -m option, to print help information in a man page-like format.
u. There is a new `mapfile' builtin to populate an array with lines from a
given file.
v. If a command is not found, the shell attempts to execute a shell function
named `command_not_found_handle', supplying the command words as the
function arguments.
w. There is a new shell option: `globstar'. When enabled, the globbing code
treats `**' specially -- it matches all directories (and files within
them, when appropriate) recursively.
x. There is a new shell option: `dirspell'. When enabled, the filename
completion code performs spelling correction on directory names during
completion.
y. The `-t' option to the `read' builtin now supports fractional timeout
values.
z. Brace expansion now allows zero-padding of expanded numeric values and
will add the proper number of zeroes to make sure all values contain the
same number of digits.
aa. There is a new bash-specific bindable readline function: `dabbrev-expand'.
It uses menu completion on a set of words taken from the history list.
bb. The command assigned to a key sequence with `bind -x' now sets two new
variables in the environment of the executed command: READLINE_LINE_BUFFER
and READLINE_POINT. The command can change the current readline line
and cursor position by modifying READLINE_LINE_BUFFER and READLINE_POINT,
respectively.
cc. There is a new &>> redirection operator, which appends the standard output
and standard error to the named file.
dd. The parser now understands `|&' as a synonym for `2>&1 |', which redirects
the standard error for a command through a pipe.
ee. The new `;&' case statement action list terminator causes execution to
continue with the action associated with the next pattern in the
statement rather than terminating the command.
ff. The new `;;&' case statement action list terminator causes the shell to
test the next set of patterns after completing execution of the current
action, rather than terminating the command.
gg. The shell understands a new variable: PROMPT_DIRTRIM. When set to an
integer value greater than zero, prompt expansion of \w and \W will
retain only that number of trailing pathname components and replace
the intervening characters with `...'.
hh. There are new case-modifying word expansions: uppercase (^[^]) and
lowercase (,[,]). They can work on either the first character or
array element, or globally. They accept an optional shell pattern
that determines which characters to modify. There is an optionally-
configured feature to include capitalization operators.