Bash-3.0 available for FTP
Chet Ramey
============
The first public release of bash-3.0 is now available with the URLs
ftp://ftp.cwru.edu/pub/bash/bash-3.0.tar.gz
ftp://ftp.gnu.org/pub/gnu/bash/bash-3.0.tar.gz
and from the usual GNU mirror sites.
This tar file does not include the formatted documentation
(postscript, dvi, html, and nroffed versions of the manual pages);
that may be retrieved with the URLs
ftp://ftp.cwru.edu/pub/bash/bash-doc-3.0.tar.gz
ftp://ftp.gnu.org/pub/gnu/bash/bash-doc-3.0.tar.gz
When unpacking the documentation, make sure to extract the tar file
in the bash-3.0 source directory.
Diffs from bash-2.05b are available with the URLs
ftp://ftp.cwru.edu/pub/bash/bash-2.05b-3.0.diff.gz
ftp://ftp.gnu.org/pub/gnu/bash/bash-2.05b-3.0.diff.gz
Make sure to apply the diffs using `patch -p1' from within a
patched bash-2.05b source directory.
Please use `bashbug' to report bugs with this version. It is built
and installed at the same time as bash.
Installation
============
Please read the README file first.
Installation instructions are provided in the INSTALL file.
New Features
============
This is the third major release of bash.
Bash-3.0 provides a number of bug fixes and cleanups to the features
introduced in the previous several releases. More improvements and
speedups to the multibyte character support are present. Several bug fixes
for POSIX compliance came in from Apple; their assistance is appreciated.
A significant change is the further internationalization of the shell: the
GNU libintl library has been integrated, every shell message has been
marked for possible translation into other languages, and the standard GNU
framework for incorporating such translations is in place. Support for
the bash debugger (a separate project) has been integrated. A number of
smaller new features are listed below.
Read the file NEWS in the bash-3.0 distribution for a complete description
of the new features. Here is a short list:
o Features to support the bash debugger have been implemented, and there
is a new `extdebug' option to turn the non-default options on
o HISTCONTROL is now a colon-separated list of options and has been
extended with a new `erasedups' option that will result in only one
copy of a command being kept in the history list
o Brace expansion has been extended with a new {x..y} form, producing
sequences of digits or characters
o Timestamps are now kept with history entries, with an option to save
and restore them from the history file; there is a new HISTTIMEFORMAT
variable describing how to display the timestamps when listing history
entries
o The `[[' command can now perform extended regular expression (egrep-like)
matching, with matched subexpressions placed in the BASH_REMATCH array
variable
o A new `pipefail' option causes a pipeline to return a failure status if
any command in it fails
o The `jobs', `kill', and `wait' builtins now accept job control notation
in their arguments even if job control is not enabled
Changes have been made to the Readline library being released at
the same time as bash-3.0, readline-5.0, so that Bash can be
linked against an already-installed Readline library rather than
the private version in lib/readline. Only readline-5.0 and later
versions are able to provide all of the symbols that bash-3.0
requires; earlier versions of the Readline library will not work
correctly.
A complete list of changes between bash-2.05b and bash-3.0 is
available in the file CHANGES; the relevant portions are appended.
Readline
========
Also available is a new release of the standalone readline library,
version 5.0, with its own configuration scripts and Makefiles.
It can be retrieved with the URLs
ftp://ftp.cwru.edu/pub/bash/readline-5.0.tar.gz
ftp://ftp.gnu.org/pub/gnu/readline/readline-5.0.tar.gz
and from the usual GNU mirror sites.
Diffs from readline-4.3 are available with the URLs
ftp://ftp.cwru.edu/pub/bash/readline-4.3-5.0.diff.gz
ftp://ftp.gnu.org/pub/gnu/readline/readline-4.3-5.0.diff.gz
Make sure to install the patches using `patch -p1 < patch-file' from
within a readline-4.3 source directory.
The formatted Readline documentation is included in the readline
distribution tar file.
A separate announcement listing the changes in Readline is being
distributed.
As always, thanks for your help.
Chet
+========== CHANGES ==========+
This document details the changes between this version, bash-3.0-release,
and the previous version, bash-3.0-rc1.
1. Changes to Bash
a. Fixed a boundary overrun that could cause segmentation faults when the
completion code hands an incomplete construct to the word expansion
functions.
b. Changed posix mode behavior so that an error in a variable assignment
preceding a special builtin causes a non-interactive shell to exit.
c. Change the directory expansion portion of the completion code to not
expand embedded command substitutions if the directory name appears in
the file system.
d. Fixed a problem that caused `bash -r' to turn on restrictions before
reading the startup files.
e. Fixed a problem with the default operation of the `umask' builtin.
2. Changes to Readline
a. Fixed a problem with readline saving the contents of the current line
before beginning a non-interactive search.
b. Fixed a problem with EOF detection when using rl_event_hook.
c. Fixed a problem with the vi mode `p' and `P' commands ignoring numeric
arguments.
------------------------------------------------------------------------------
This document details the changes between this version, bash-3.0-rc1,
and the previous version, bash-3.0-beta1.
1. Changes to Bash
a. Fixed a bug that caused incorrect behavior when referecing element 0 of
an array using $array, element 0 was unset, and `set -u' was enabled.
b. System-specific changes for: SCO Unix 3.2, Tandem.
c. Fixed a bug that caused inappropriate word splitting when a variable was
expanded within a double-quoted string that also included $@.
d. Fixed a bug that caused `pwd' to not display anything in physical mode
when the file system had changed underneath the shell.
e. Fixed a bug in the pre- and post- increment and decrement parsing in the
expression evaluator that caused errors when the operands and corresponding
operators were separated by whitespace.
f. Fixed a bug that caused `history -p' to add an entry to the history list,
counter to the documentation. (Keeps the history expansions invoked by
emacs-mode command line editing from doing that as well.)
g. Fixed a bug that could cause a core dump if `cd' is asked to print out a
pathname longer than PATH_MAX characters.
h. Fixed a bug that caused jobs to be put into the wrong process group under
some circumstances after enabling job control with `set -m'.
i. `unalias' now returns failure if no alias name arguments are supplied.
j. Documented the characters not allowed to appear in an alias name.
k. $* is no longer expanded as if in double quotes when it appears in the
body of a here document, as the SUS seems to require.
l. The `bashbug' script now uses a directory in $TMPDIR for exclusive
access rather than trying to guess how the underlying OS provides for
secure temporary file creation.
m. Fixed a few problems with `cd' and `pwd' when asked to operate on pathnames
longer than PATH_MAX characters.
n. Fixed a memory leak caused when creating multiple local array variables
with identical names.
o. Fixed a problem with calls to getcwd() so that bash now operates better
when the full pathname to the current directory is longer than PATH_MAX
bytes.
p. The `trap' builtin now reports an error if a single non-signal argument
is specified.
q. Fixed a bug that caused `umask' to not work correctly when presented
with a mask of all 0s.
r. When `getopts' reaches the end of options, OPTARG is unset, as POSIX
appears to specify.
s. Interactive mode now depends on whether or not stdin and stderr are
connected to a tty; formerly it was stdin and stdout. POSIX requires
this.
t. Fixed vi-mode completion to work more as POSIX specifies (e.g., doing the
right kind of filename generation).
2. Changes to Readline
a. Fixed a problem that could cause readline to refer to freed memory when
moving between history lines while doing searches.
b. Improvements to the code that expands and displays prompt strings
containing multibyte characters.
c. Fixed a problem with vi-mode not correctly remembering the numeric argument
to the last `c'hange command for later use with `.'.
d. Fixed a bug in vi-mode that caused multi-digit count arguments to work
incorrectly.
e. Fixed a problem in vi-mode that caused the last text modification command
to not be remembered across different command lines.
f. Fixed problems with changing characters and changing case at the end of
the line.
3. New Features in Bash
a. The `jobs', `kill', and `wait' builtins now accept job control notation
even if job control is not enabled.
b. The historical behavior of `trap' that allows a missing `action' argument
to cause each specified signal's handling to be reset to its default is
now only supported when `trap' is given a single non-option argument.
4. New Features in Readline
a. When listing completions, directories have a `/' appended if the
`mark-directories' option has been enabled.
------------------------------------------------------------------------------
This document details the changes between this version, bash-3.0-beta1,
and the previous version, bash-3.0-alpha.
1. Changes to Bash
a. Fixes to build correctly when arrays are not compiled into the shell.
b. Fixed command substitution to run any exit trap defined in the command
substitution before returning; the exit trap is not inherited from the
calling shell.
c. Fixes to process group synchronization code so that every child process
attempts to set the terminal's process group; fixes some synchronization
problems on Linux kernels that schedule the child to always run before
the parent.
d. Fixed processing of octal and hex constants in printf builtin for POSIX.2
compliance.
e. Fixed a couple of core dumps in the pattern removal code.
f. Fixes to the array subrange extraction code to deal better with sparse
arrays.
g. Parser errors and other errors that result in the shell exiting now cause
the exit trap to be run.
h. Change the command substitution completion functions to not append any
closing quote, because it would be inserted a closing "`" or ")".
i. Fix history initialization so assignments to $histchars made in startup
files are honored.
j. If an exit trap does not contain a call to `exit', the shell now uses
the exit status of the last command executed before the trap as the exit
status of the shell.
k. The parser now prompts with $PS2 if it reads a newline while parsing a
compound array assignment statement.
l. When performing a compound array assignment, the parser doesn't treat
words of the form [index]=value as assignments if they're the result of
expansions.
m. Fixed a bug that caused `return' executed in a trap command to make the
shell think it was still running the trap.
n. Fixed the value of errno set by the pathname canonicalization functions.
o. Changed the grammar so that `time' alone on a line times a null command
rather than being a syntax error.
p. The pattern substitution coded no longer performs quote removal on the
pattern before trying to match it, as the pattern removal functions do.
q. Fixed a bug that could cause core dumps when checking whether a quoted
command name was being completed.
r. Fixes to the pattern removal and pattern replacement expansions to deal
with multibyte characters better (and faster).
s. Fix to the substring expansion (${param:off[:len]}) to deal with (possibly
multibyte) characters instead of raw bytes.
t. Fixed a bug that caused some key bindings set in an inputrc to be ignored
at shell startup.
u. Fixed a bug that caused unsetting a local variable within a function to
not work correctly.
v. Fixed a bug that caused invalid variables to be created when using
`read -a'.
w. Fixed a bug that caused "$@" to expand incorrectly when used as the right
hand side of a parameter expansion such as ${word:="$@"} if the first
character of $IFS was not a space.
x. Fixed a slight cosmetic problem when printing commands containing a
`>&word' redirection.
y. Fixed a problem that could cause here documents to not be created correctly
if the system temporary directory did not allow writing.
2. Changes to Readline
a. Change to history expansion functions to treat `^' as equivalent to word
one, as the documention states.
b. Some changes to the display code to improve display and redisplay of
multibyte characters.
c. Changes to speed up the multibyte character redisplay code.
d. Fixed a bug in the vi-mode `E' command that caused it to skip over the
last character of a word if invoked while point was on the word's
next-to-last character.
e. Fixed a bug that could cause incorrect filename quoting when
case-insensitive completion was enabled and the word being completed
contained backslashes quoting word break characters.
f. Fixed a bug in redisplay triggered when the prompt string contains
invisible characters.
g. Fixed some display (and other) bugs encountered in multibyte locales
when a non-ascii character was the last character on a line.
h. Fixed some display bugs caused by multibyte characters in prompt strings.
i. Fixed a problem with history expansion caused by non-whitespace characters
used as history word delimiters.
3. New Features in Bash
a. printf builtin understands two new escape sequences: \" and \?.
b. `echo -e' understands two new escape sequences: \" and \?.
c. The GNU `gettext' package and libintl have been integrated; the shell's
messages can be translated into different languages.
d. The `\W' prompt expansion now abbreviates $HOME as `~', like `\w'.
e. The error message printed when bash cannot open a shell script supplied
as argument 1 now includes the name of the shell, to better identify
the error as coming from bash.
4. New Features in Readline
a. New application variable, rl_completion_quote_character, set to any
quote character readline finds before it calls the application completion
function.
b. New application variable, rl_completion_suppress_quote, settable by an
application completion function. If set to non-zero, readline does not
attempt to append a closing quote to a completed word.
c. New application variable, rl_completion_found_quote, set to a non-zero
value if readline determines that the word to be completed is quoted.
Set before readline calls any application completion function.
d. New function hook, rl_completion_word_break_hook, called when readline
needs to break a line into words when completion is attempted. Allows
the word break characters to vary based on position in the line.
e. New bindable command: unix-filename-rubout. Does the same thing as
unix-word-rubout, but adds `/' to the set of word delimiters.
------------------------------------------------------------------------------
This document details the changes between this version, bash-3.0-alpha,
and the previous version, bash-2.05b-release.
1. Changes to Bash
a. Fixes so that the shell will compile without some of the default options
defined.
b. Fixed an error message that did not pass enough arguments to printf.
c. Fixed a bug that caused input redirection to a builtin inside a script
being read from standard input to result in the rest of the already-
read and buffered script to be discarded.
d. Fixed a bug that caused subshell initialization to close the file
descriptor from which the shell was reading a script under certain
circumstances.
e. Fixed a bug that caused the shell to not advance a string pointer over
a null wide character when doing string operations.
f. Fixed the internal logout code so that shells that time out waiting for
input (using $TMOUT) run ~/.bash_logout.
g. Portability and configuration changes for: cygwin, HP/UX, GNU/FreeBSD.
h. The parser no longer adds implicit double quotes to ((...)) arithmetic
commands.
i. The ((...)) arithmetic command evaluation code was fixed to not dump core
when the expanded string is null.
j. The ((...)) arithmetic command evaluation code was fixed to not perform
variable assignments while expanding the expression.
k. Fixed a bug that caused word splitting to be performed incorrectly when
IFS is set, but null.
l. Fixed a bug in brace expansion that caused a quoted `$' preceding an
open brace to inhibit brace expansion.
m. Fixed a bug that caused a leading `-' in the shell's name to cause it to
not be recognized as a restricted shell.
n. Fixed a bug in the arithmetic evaluation code that could cause longjmps
to an invalid location and result in a core dump.
o. Fixed a bug in the calculation of how many history lines are new in a
single shell session when reading new history lines from a file with
`history -n'.
p. Fixed a bug in pathname canonicalization that caused the shell to dump
core when presented with a pathname longer than PATH_MAX.
q. Fixed the parser so that it doesn't try to compare a char variable to
EOF, which fails when chars are unsigned.
r. Fixed a bug in the simple command execution code that caused occasional
core dumps.
s. The shell does a better job of saving any partial parsing state during
operations which cause a command to be executed while a line is being
entered and parsed.
t. The completion code now splits words more like the expansion code when
$IFS is used to split.
u. The locale code does a better job of recomputing the various locale
variable values when LC_ALL is unset.
v. The programmable completion code does a better job of dequoting expanded
word lists before comparing them against the word to be matched.
w. The shell no longer seg faults if the expanded value of $PS4 is null
and `set -x' is enabled.
x. Fixed a bug that caused core dumps when a here string expanded to NULL.
y. The mail checking code now makes sure the mailbox is bigger before
reporting the existence of new mail.
z. The parser does not try to expand $'...' and $"..." when the appear
within double quotes unless the `extquote' option has been enabled with
`shopt'. For backwards compatibility, it is enabled by default.
aa. Fixed a bug that caused `for x; do ...' and `select x; do ... to use
$@ instead of "$@" for the implicit list of arguments.
bb. Fixed a bug that caused a subshell of a restricted shell (e.g., one
spawned to execute a pipeline) to not exit immediately if attempting
to use a command containing a slash.
cc. Fixed a problem with empty replacements for a pattern that doesn't match
when performing ${param/word/} expansion.
dd. Word expansions performed while expanding redirections no longer search
a command's temporary environment to expand variable values.
ee. Improvements to the alias expansion code when expanding subsequent words
because an aliase's value ends with a space.
ff. `cd -' now prints the current working directory after a successful chdir
even when the shell is not interactive, as the standard requires.
gg. The shell does a better job of ensuring a child process dies of SIGINT
before resending SIGINT to itself.
hh. The arithmetic expansion variable assignment code now does the right
thing when assigning to `special' variables like OPTIND.
ii. When history expansion verification is enabled, the bash readline helper
functions that do history expansion on the current line don't print
the results.
jj. Fixed bugs with multiple consecutive alias expansion when one of the
expansions ends with a space.
kk. Fixed a problem in the programmable completion code that could cause core
dumps when trying to initialize a set of possible completions from a
list of variables.
ll. The \[ and \] escape characters are now ignored when decoding the prompt
string if the shell is started with editing disabled.
mm. Fixed a bug that could leave extra characters in a string when doing
quoted null character removal.
nn. Command substitution and other subshell operations no longer reset the
line number (aids the bash debugger).
oo. Better line number management when executing simple commands, conditional
commands, for commands, and select commands.
pp. The globbing code now uses malloc, with its better failure properties,
rather than alloca().
qq. Fixed a bug that caused expansions like #{a[2]:=value} to create the
appropriate array element instead of a variable named `a[2]'.
rr. Fixed a bug in the handling of a `?(...)' pattern immediately following
a `*' when extglob is enabled.
ss. Fixed a bug that caused a `return' invoked in an exit trap when exit is
invoked in a function to misbehave.
tt. Fixed a bug that caused CTLESC and CTLNUL characters to not be escaped
by the internal shell string quoting functions.
uu. Fixed a bug that caused quoted null characters in an expanded word list
to be inappropriately assigned to an array variable when using `read -a'.
vv. Fixed a bug that caused redirections accompanying a null command to persist
in the current shell.
ww. Fixed a bug that caused the prompt to be printed when the shell was
expanding a multiline alias.
xx. Fixed a bug that resulted in core dumps when the completion for a command
changed the compspec.
yy. Fixed a bug that caused evaluation of programmable completions to print
notifications of completed jobs.
zz. Bash now disables line editing when $EMACS == `t' and $TERM == `dumb'
(which is what emacs shell windows do).
aaa. In posix mode, `kill -l' causes signal names to be displayed without
a leading `SIG'.
bbb. Clear error flag on standard output so it doesn't persist across multiple
builtin commands.
ccc. In posix mode, `alias' displays alias values without the leading `alias',
so the output cannot be used as subsequent input.
ddd. In posix mode, the `trap' builtin doesn't check whether or not its
first argument is a signal specification and revert the signal handling
to its original disposition if it is.
eee. Fixed several bugs in the handling of "$*" and "${array[*]}" by the
pattern substitution and removal expansions.
fff. Fixed several problems with the handling of ${array[@]}, ${array[*]},
$@, and $* by the indirect variable expansion code.
ggg. Fixed a bug that did not allow `time' to be aliased.
hhh. Improved the mail checking code so it won't check (and possibly cause an
NFS file system mount) until MAILPATH or MAIL is given a value -- there
is no default if DEFAULT_MAIL_DIRECTORY is not defined at compile time.
(It is computed by configure, but can be #undef'd in config-bot.h.)
iii. If the `chkwinsize' option is enabled, the shell checks for window size
changes if a child process exits due to a signal.
jjj. Removed the attempts to avoid adding a slash at the end of a completed
executable name if there was a directory with the same name in the
current directory.
kkk. Fixed PATH lookup code so it treats the permission bits separately for
owner, group, and other, rather than checking them all.
lll. Fixed the locale code to reset the parser's idea of the character class
<blank>, which controls how it splits tokens, when the locale changes.
mmm. The shell now binds its special readline functions and key bindings only
if the user's inputrc file has not already bound them.
nnn. The shell now reports on processes that dump core due to signals when
invoked as `-c command'.
2. Changes to Readline
a. Fixes to avoid core dumps because of null pointer references in the
multibyte character code.
b. Fix to avoid infinite recursion caused by certain key combinations.
c. Fixed a bug that caused the vi-mode `last command' to be set incorrectly.
d. Readline no longer tries to read ahead more than one line of input, even
when more is available.
e. Fixed the code that adjusts the point to not mishandle null wide
characters.
f. Fixed a bug in the history expansion `g' modifier that caused it to skip
every other match.
g. Fixed a bug that caused the prompt to overwrite previous output when the
output doesn't contain a newline and the locale supports multibyte
characters. This same change fixes the problem of readline redisplay
slowing down dramatically as the line gets longer in multibyte locales.
h. History traversal with arrow keys in vi insertion mode causes the cursor
to be placed at the end of the new line, like in emacs mode.
i. The locale initialization code does a better job of using the right
precedence and defaulting when checking the appropriate environment
variables.
j. Fixed the history word tokenizer to handle <( and >( better when used as
part of bash.
k. The overwrite mode code received several bug fixes to improve undo.
l. Many speedups to the multibyte character redisplay code.
m. The callback character reading interface should not hang waiting to read
keyboard input.
n. Fixed a bug with redoing vi-mode `s' command.
o. The code that initializes the terminal tracks changes made to the terminal
special characters with stty(1) (or equivalent), so that these changes
are reflected in the readline bindings. New application-callable function
to make it work: rl_tty_unset_default_bindings().
p. Fixed a bug that could cause garbage to be inserted in the buffer when
changing character case in vi mode when using a multibyte locale.
q. Fixed a bug in the redisplay code that caused problems on systems
supporting multibyte characters when moving between history lines when the
new line has more glyphs but fewer bytes.
r. Undo and redo now work better after exiting vi insertion mode.
s. Make sure system calls are restarted after a SIGWINCH is received using
SA_RESTART.
t. Improvements to the code that displays possible completions when using
multibyte characters.
u. Fixed a problem when parsing nested if statements in inputrc files.
v. The completer now takes multibyte characters into account when looking for
quoted substrings on which to perform completion.
w. The history search functions now perform better bounds checking on the
history list.
3. New Features in Bash
a. ANSI string expansion now implements the \x{hexdigits} escape.
b. There is a new loadable `strftime' builtin.
c. New variable, COMP_WORDBREAKS, which controls the readline completer's
idea of word break characters.
d. The `type' builtin no longer reports on aliases unless alias expansion
will actually be performed.
e. HISTCONTROL is now a colon-separated list of values, which permits
more extensibility and backwards compatibility.
f. HISTCONTROL may now include the `erasedups' option, which causes all lines
matching a line being added to be removed from the history list.
g. `configure' has a new `--enable-multibyte' argument that permits multibyte
character support to be disabled even on systems that support it.
h. New variables to support the bash debugger: BASH_ARGC, BASH_ARGV,
BASH_SOURCE, BASH_LINENO, BASH_SUBSHELL, BASH_EXECUTION_STRING,
BASH_COMMAND
i. FUNCNAME has been changed to support the debugger: it's now an array
variable.
j. for, case, select, arithmetic commands now keep line number information
for the debugger.
k. There is a new `RETURN' trap executed when a function or sourced script
returns (not inherited child processes; inherited by command substitution
if function tracing is enabled and the debugger is active).
l. New invocation option: --debugger. Enables debugging and turns on new
`extdebug' shell option.
m. New `functrace' and `errtrace' options to `set -o' cause DEBUG and ERR
traps, respectively, to be inherited by shell functions. Equivalent to
`set -T' and `set -E' respectively. The `functrace' option also controls
whether or not the DEBUG trap is inherited by sourced scripts.
n. The DEBUG trap is run before binding the variable and running the action
list in a `for' command, binding the selection variable and running the
query in a `select' command, and before attempting a match in a `case'
command.
o. New `--enable-debugger' option to `configure' to compile in the debugger
support code.
p. `declare -F' now prints out extra line number and source file information
if the `extdebug' option is set.
q. If `extdebug' is enabled, a non-zero return value from a DEBUG trap causes
the next command to be skipped, and a return value of 2 while in a
function or sourced script forces a `return'.
r. New `caller' builtin to provide a call stack for the bash debugger.
s. The DEBUG trap is run just before the first command in a function body is
executed, for the debugger.
t. `for', `select', and `case' command heads are printed when `set -x' is
enabled.
u. There is a new {x..y} brace expansion, which is shorthand for {x.x+1,
x+2,...,y}. x and y can be integers or single characters; the sequence
may ascend or descend; the increment is always 1.
v. New ksh93-like ${!array[@]} expansion, expands to all the keys (indices)
of array.
w. New `force_fignore' shopt option; if enabled, suffixes specified by
FIGNORE cause words to be ignored when performing word completion even
if they're the only possibilities.
x. New `gnu_errfmt' shopt option; if enabled, error messages follow the `gnu
style' (filename:lineno:message) format.
y. New `-o bashdefault' option to complete and compgen; if set, causes the
whole set of bash completions to be performed if the compspec doesn't
result in a match.
z. New `-o plusdirs' option to complete and compgen; if set, causes directory
name completion to be performed and the results added to the rest of the
possible completions.
aa. `kill' is available as a builtin even when the shell is built without
job control.
bb. New HISTTIMEFORMAT variable; value is a format string to pass to
strftime(3). If set and not null, the `history' builtin prints out
timestamp information according to the specified format when displaying
history entries. If set, bash tells the history library to write out
timestamp information when the history file is written.
cc. The [[ ... ]] command has a new binary `=~' operator that performs
extended regular expression (egrep-like) matching.
dd. `configure' has a new `--enable-cond-regexp' option (enabled by default)
to enable the =~ operator and regexp matching in [[ ... ]].
ee. Subexpressions matched by the =~ operator are placed in the new
BASH_REMATCH array variable.
ff. New `failglob' option that causes an expansion error when pathname
expansion fails to produce a match.
gg. New `set -o pipefail' option that causes a pipeline to return a failure
status if any of the processes in the pipeline fail, not just the last
one.
4. New Features in Readline
a. History expansion has a new `a' modifier equivalent to the `g' modifier
for compatibility with the BSD csh.
b. History expansion has a new `G' modifier equivalent to the BSD csh `g'
modifier, which performs a substitution once per word.
c. All non-incremental search operations may now undo the operation of
replacing the current line with the history line.
d. The text inserted by an `a' command in vi mode can be reinserted with
`.'.
e. New bindable variable, `show-all-if-unmodified'. If set, the readline
completer will list possible completions immediately if there is more
than one completion and partial completion cannot be performed.
f. There is a new application-callable `free_history_entry()' function.
g. History list entries now contain timestamp information; the history file
functions know how to read and write timestamp information associated
with each entry.
h. Four new key binding functions have been added:
rl_bind_key_if_unbound()
rl_bind_key_if_unbound_in_map()
rl_bind_keyseq_if_unbound()
rl_bind_keyseq_if_unbound_in_map()
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )
Live...Laugh...Love
Chet Ramey, ITS, CWRU ch...@po.cwru.edu http://tiswww.tis.cwru.edu/~chet/