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* [[http://cnswww.cns.cwru.edu/~chet/bash/NEWS|NEWS]]: a file tersely listing the notable changes between the current and previous versions * [[http://cnswww.cns.cwru.edu/~chet/bash/CHANGES|CHANGES]]: a "complete" bash change history (back to 2.0 only) * [[http://cnswww.cns.cwru.edu/~chet/bash/COMPAT|COMPAT]]: compatibility issues between bash3 and previous versions |
* [[http://tiswww.case.edu/php/chet/bash/NEWS|NEWS]]: a file tersely listing the notable changes between the current and previous versions * [[http://tiswww.case.edu/php/chet/bash/CHANGES|CHANGES]]: a "complete" bash change history (back to 2.0 only) * [[http://tiswww.case.edu/php/chet/bash/COMPAT|COMPAT]]: compatibility issues between bash3 and previous versions |
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Here's a ''partial'' list of the changes, in a more compact format: | A more extensive list than the one below can be found at http://wiki.bash-hackers.org/scripting/bashchanges |
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||'''Feature'''||'''Added in version'''|| ||read -N||4.1-alpha|| ||associative arrays||4.0-alpha|| ||&>> and |&||4.0-alpha|| ||coproc||4.0-alpha|| ||globstar||4.0-alpha|| ||mapfile/readarray||4.0-alpha|| ||x+=string||3.1-alpha1|| ||printf -v var||3.1-alpha1|| ||{x..y}||3.0-alpha|| ||${!array[@]}||3.0-alpha|| ||[[ =~||3.0-alpha|| ||<<<||2.05b-alpha1|| ||i++||2.04-devel|| ||for ((;;))||2.04-devel|| ||/dev/fd/N, /dev/tcp/host/port, etc.||2.04-devel|| ||a=(*.txt) file expansion||2.03-alpha|| ||extglob||2.02-alpha1|| ||[[||2.02-alpha1|| ||builtin printf||2.02-alpha1|| ||$(< filename)||2.02-alpha1|| ||** (exponentiation)||2.02-alpha1|| ||\xNNN||2.02-alpha1|| ||(( ))||2.0-beta2|| |
=== Notable changes expected in next bash release (5.0) === ||'''Feature''' ||'''Added in version''' || ||BASH_ARGV0 (variable) || 5.0 (2018?) || ||EPOCHREALTIME, EPOCHSECONDS (variables) ||5.0 (2018?) || ||wait -f ||5.0 (2018?) || ||history -d allows negative offsets ||5.0 (2018?) || ||assoc_expand_once (shopt) ||5.0 (2018?) || ||localvar_inherit (shopt) ||5.0 (2018?) || === Notable changes in released bash versions === ||'''Feature''' ||'''Added in version''' ||'''Copied/inspired from''' || ||PS0 (variable) ||4.4 (2016) ||native || ||[[BashLoadableBuiltins|loadable builtin]] deployment infrastructure ||4.4 (2016) ||ksh93 (1993) || ||mapfile/readarray -d ||4.4 (2016) ||native || ||--help for builtins ||4.4 (2016) ||ksh93 (2001, possibly earlier) || ||${var@spec} ||4.4 (2016) ||mksh (2012) for the syntax, zsh (1990s) for the feature || ||local - ||4.4 (2016) ||Almquist shell (1989) || ||$! and wait for process substitutions ||4.4 (2016) ||native || ||wait -n ||4.3 (2014) ||native || ||test -R ||4.3 (2014) ||ksh93 (1993) || ||declare/typeset -n and associated changes to ${!ref} and for..in ||4.3 (2014) ||ksh93 (1993) || ||array[-idx] (in assignments, read, unset, etc) ||4.3 (2014) ||zsh (1990s) || ||\uXXXX and \UXXXXXXXX ||4.2 (2011) ||zsh (2001) || ||declare -g ||4.2 (2011) ||zsh (1990s) || ||test -v ||4.2 (2011) ||ksh93 (2009) || ||printf %(fmt)T ||4.2 (2011) ||ksh93 (1999) || ||${array[-idx]} and ${var:start:-len} ||4.2 (2011) ||zsh (1990s) and native || ||lastpipe (shopt) ||4.2 (2011) ||ksh (1980s) default behaviour there || ||read -N ||4.1 (2010) ||ksh93 (2003) || ||{var}> or {var}< etc. (FD variable assignment) ||4.1 (2010) ||developed jointly with ksh93 and zsh || ||syslog history (compile option) ||4.1 (2010) ||native || ||BASH_XTRACEFD ||4.1 (2010) ||native || ||;& and ;;& fall-throughs for case ||4.0 (2009) ||ksh93 (1993) || ||associative arrays ||4.0 (2009) ||ksh93 (1993) || ||&>> and |& ||4.0 (2009) ||native and csh (1970s) || ||command_not_found_handle (function) ||4.0 (2009) ||native || ||coproc (keyword) ||4.0 (2009) ||ksh (1980s), zsh (1990) for the coproc keyword || ||globstar (shopt) ||4.0 (2009) ||zsh (1992), ksh93 (2005) for the name of the option || ||mapfile/readarray (builtin) ||4.0 (2009) ||native || ||${var,} ${var,,} ${var^} ${var^^} ||4.0 (2009) ||native || ||{009..012} (leading zeros in brace expansions) ||4.0 (2009) ||zsh (1995) || ||{x..y..incr} ||4.0 (2009) ||ksh93 (2005) || ||read -t 0 (test input availability) ||4.0 (2009) || || ||read -t 0.5 ||4.0 (2009) ||zsh (2003) || ||read -i ||4.0 (2009) ||zsh (vared) (1990s) || ||x+=string array+=(string) ||3.1 (2005) ||ksh93 (2000) || ||printf -v var ||3.1 (2005) ||native || ||nocasematch (shopt) ||3.1 (2005) ||native || ||{x..y} ||3.0 (2004) ||zsh (1995) || ||${!array[@]} ||3.0 (2004) ||ksh93 (1993) || ||[[ =~ ||3.0 (2004) ||native || ||printf %q produces $'...' ||2.05b (2002) ||ksh93 (1993) || ||<<< ||2.05b (2002) ||zsh (1990s) || ||i++ ||2.04 (2000) ||ksh93 (1993) || ||for ((;;)) ||2.04 (2000) ||ksh93 (1993) || ||/dev/fd/N, /dev/tcp/host/port, etc. ||2.04 (2000) ||ksh93 (1990s) || ||read -t, -n, -d and -s ||2.04 (2000) ||ksh93 (1993) || ||a=(*.txt) file expansion ||2.03 (1999) ||ksh93 (1993) || ||extglob (shopt) ||2.02 (1998) ||ksh (1980s) || ||[[ ||2.02 (1998) ||ksh (1980s) || ||printf (builtin) ||2.02 (1998) ||ksh (1980s) || ||$(< filename) ||2.02 (1998) ||ksh (1980s) || ||** (exponentiation) ||2.02 (1998) ||zsh (1994) || ||\xNN ||2.02 (1998) ||zsh (1994 or earlier) || ||(( )) ||2.0 (1996) ||ksh (1980s) || ||arrays ||2.0 (1996) ||ksh (1980s) || ||$'...' (new quoting syntax) ||2.0 (1996) ||ksh93 (1993) || === List of bash releases and other notable events === ||'''Release''' ||'''Date''' || ||bash-4.4 ||[[http://lists.gnu.org/archive/html/bug-bash/2016-09/msg00018.html|2016-09-16]] || ||<30%>Shellshock patches are released for bash-2.05b through bash-4.3 ||2014-09-24 to 2014-10-05 || ||bash-4.3 ||[[http://lists.gnu.org/archive/html/bug-bash/2014-02/msg00081.html|2014-02-27]] || ||bash-4.2 ||[[http://lists.gnu.org/archive/html/bug-bash/2011-02/msg00134.html|2011-02-14]] || ||bash-4.1 ||[[http://lists.gnu.org/archive/html/bug-bash/2010-01/msg00000.html|2010-01-02]] || ||bash-4.0 ||[[http://lists.gnu.org/archive/html/bug-bash/2009-02/msg00164.html|2009-02-23]] || ||bash-3.2 ||[[http://lists.gnu.org/archive/html/bug-bash/2006-10/msg00057.html|2006-10-12]] || ||bash-3.1 ||[[http://lists.gnu.org/archive/html/bug-bash/2005-12/msg00018.html|2005-12-09]] || ||bash-3.0 ||[[http://lists.gnu.org/archive/html/bug-bash/2004-07/msg00255.html|2004-07-27]] || ||bash-2.05b ||[[http://lists.gnu.org/archive/html/bug-bash/2002-07/msg00169.html|2002-07-17]] || ||bash-2.05a ||[[http://lists.gnu.org/archive/html/bug-bash/2001-11/msg00086.html|2001-11-15]] || ||bash-2.05 ||[[http://lists.gnu.org/archive/html/bug-bash/2001-04/msg00047.html|2001-04-09]] || ||bash-2.04 ||http://ftp.gnu.org/gnu/bash puts it around 2000-03-21 || ||bash-2.03 ||[[https://groups.google.com/d/msg/gnu.bash.bug/3t0I8b4C848/PD66z8r966oJ|1999-02-19]] || ||bash-2.02 ||[[https://groups.google.com/d/msg/gnu.bash.bug/wjK6DNyivbo/o_fzmlMXuh4J|1998-04-20]] || ||bash-2.01 ||[[https://groups.google.com/d/msg/gnu.bash.bug/1YaFSUY31SI/QeaBAOzEfNUJ|1997-06-06]] || ||bash-2.0 ||[[https://groups.google.com/d/msg/gnu.bash.bug/WE1Fa--vKw0/l9S7xZFP44AJ|1996-12-23]] || ||bash-1.14 ||[[https://groups.google.com/d/msg/gnu.bash.bug/oOfJhX8Es74/H1fYjpvy9toJ|1994-06-02]] || ||bash-1.13 ||[[https://groups.google.com/d/msg/gnu.bash.bug/KSGrYVYsxEE/ldpQw6UHd5wJ|1993-09-03]] || ||||<style="text-align:center">Looks like Chet Ramey takes over as maintainer between 1.12 and 1.13 || ||bash-1.12 ||[[https://groups.google.com/d/msg/gnu.bash.bug/LqJlezOLPmw/fWEU5dx63swJ|1992-01-26]] || ||bash-1.11 ||[[https://groups.google.com/d/msg/gnu.bash.bug/mtiSajVLFWQ/IO7lRZZaXuEJ|1992-01-10]] || ||bash-1.10 ||First mention found at [[https://groups.google.com/d/msg/gnu.bash.bug/2JCACpoweVo/VcbTlUED2L8J|1991-10-07]], so some time before that || ||bash-1.09 ||First mention found at [[https://groups.google.com/d/msg/gnu.bash.bug/r2mPhpzeFA0/uEe2lEymOOAJ|1991-06-02]] || ||bash-1.08 ||[[https://groups.google.com/d/msg/gnu.bash.bug/6IYJUqnlXbo/PtB74jsSdBEJ|1991-05-22]] || ||bash-1.07 ||likely [[https://groups.google.com/d/msg/gnu.bash.bug/IbPT47bVNak/TgM9oOgwDOEJ|1991-02-01]] || ||bash-1.06 ||This is a tough one. There was apparently a "bootleg" version of 1.06, so this requires more digging || ||bash-1.05 ||[[https://groups.google.com/d/msg/gnu.bash.bug/sdSJj38zObM/9OJmiMwsEeYJ|1990-03-03]] || ||bash-1.04 ||First mention found at [[https://groups.google.com/d/msg/gnu.bash.bug/OEAOMxIgXNM/_0MmMKhwBUoJ|1989-11-07]] || ||bash-1.03 ||[[https://groups.google.com/d/msg/gnu.bash.bug/0BNtldi31-I/0z3R_gKQQ5AJ|1989-09-02]] || ||bash-1.02 ||First mention found at [[https://groups.google.com/d/msg/gnu.bash.bug/n6oK8g9ZT_s/ZoiyAtJ0PmgJ|1989-07-09]] || ||bash-1.01 ||[[https://groups.google.com/d/msg/gnu.bash.bug/cDuxRblQx4c/KsqoeeDF7KgJ|1989-06-23]] || ||bash-1.00 ||Hard to search for ... || ||bash-0.99 ||First mention found at [[https://groups.google.com/d/msg/gnu.bash.bug/dliLANZUdwI/X-lY_E-bDRMJ|1989-06-11]] || |
Is there a list of which features were added to specific releases (versions) of Bash?
Here are some links to official Bash documentation:
NEWS: a file tersely listing the notable changes between the current and previous versions
CHANGES: a "complete" bash change history (back to 2.0 only)
COMPAT: compatibility issues between bash3 and previous versions
A more extensive list than the one below can be found at http://wiki.bash-hackers.org/scripting/bashchanges
Notable changes expected in next bash release (5.0)
Feature |
Added in version |
BASH_ARGV0 (variable) |
5.0 (2018?) |
EPOCHREALTIME, EPOCHSECONDS (variables) |
5.0 (2018?) |
wait -f |
5.0 (2018?) |
history -d allows negative offsets |
5.0 (2018?) |
assoc_expand_once (shopt) |
5.0 (2018?) |
localvar_inherit (shopt) |
5.0 (2018?) |
Notable changes in released bash versions
Feature |
Added in version |
Copied/inspired from |
PS0 (variable) |
4.4 (2016) |
native |
loadable builtin deployment infrastructure |
4.4 (2016) |
ksh93 (1993) |
mapfile/readarray -d |
4.4 (2016) |
native |
--help for builtins |
4.4 (2016) |
ksh93 (2001, possibly earlier) |
${var@spec} |
4.4 (2016) |
mksh (2012) for the syntax, zsh (1990s) for the feature |
local - |
4.4 (2016) |
Almquist shell (1989) |
$! and wait for process substitutions |
4.4 (2016) |
native |
wait -n |
4.3 (2014) |
native |
test -R |
4.3 (2014) |
ksh93 (1993) |
declare/typeset -n and associated changes to ${!ref} and for..in |
4.3 (2014) |
ksh93 (1993) |
array[-idx] (in assignments, read, unset, etc) |
4.3 (2014) |
zsh (1990s) |
\uXXXX and \UXXXXXXXX |
4.2 (2011) |
zsh (2001) |
declare -g |
4.2 (2011) |
zsh (1990s) |
test -v |
4.2 (2011) |
ksh93 (2009) |
printf %(fmt)T |
4.2 (2011) |
ksh93 (1999) |
${array[-idx]} and ${var:start:-len} |
4.2 (2011) |
zsh (1990s) and native |
lastpipe (shopt) |
4.2 (2011) |
ksh (1980s) default behaviour there |
read -N |
4.1 (2010) |
ksh93 (2003) |
{var}> or {var}< etc. (FD variable assignment) |
4.1 (2010) |
developed jointly with ksh93 and zsh |
syslog history (compile option) |
4.1 (2010) |
native |
BASH_XTRACEFD |
4.1 (2010) |
native |
;& and ;;& fall-throughs for case |
4.0 (2009) |
ksh93 (1993) |
associative arrays |
4.0 (2009) |
ksh93 (1993) |
&>> and |& |
4.0 (2009) |
native and csh (1970s) |
command_not_found_handle (function) |
4.0 (2009) |
native |
coproc (keyword) |
4.0 (2009) |
ksh (1980s), zsh (1990) for the coproc keyword |
globstar (shopt) |
4.0 (2009) |
zsh (1992), ksh93 (2005) for the name of the option |
mapfile/readarray (builtin) |
4.0 (2009) |
native |
${var,} ${var,,} ${var^} ${var^^} |
4.0 (2009) |
native |
{009..012} (leading zeros in brace expansions) |
4.0 (2009) |
zsh (1995) |
{x..y..incr} |
4.0 (2009) |
ksh93 (2005) |
read -t 0 (test input availability) |
4.0 (2009) |
|
read -t 0.5 |
4.0 (2009) |
zsh (2003) |
read -i |
4.0 (2009) |
zsh (vared) (1990s) |
x+=string array+=(string) |
3.1 (2005) |
ksh93 (2000) |
printf -v var |
3.1 (2005) |
native |
nocasematch (shopt) |
3.1 (2005) |
native |
{x..y} |
3.0 (2004) |
zsh (1995) |
${!array[@]} |
3.0 (2004) |
ksh93 (1993) |
[[ =~ |
3.0 (2004) |
native |
printf %q produces $'...' |
2.05b (2002) |
ksh93 (1993) |
<<< |
2.05b (2002) |
zsh (1990s) |
i++ |
2.04 (2000) |
ksh93 (1993) |
for ((;;)) |
2.04 (2000) |
ksh93 (1993) |
/dev/fd/N, /dev/tcp/host/port, etc. |
2.04 (2000) |
ksh93 (1990s) |
read -t, -n, -d and -s |
2.04 (2000) |
ksh93 (1993) |
a=(*.txt) file expansion |
2.03 (1999) |
ksh93 (1993) |
extglob (shopt) |
2.02 (1998) |
ksh (1980s) |
[[ |
2.02 (1998) |
ksh (1980s) |
printf (builtin) |
2.02 (1998) |
ksh (1980s) |
$(< filename) |
2.02 (1998) |
ksh (1980s) |
** (exponentiation) |
2.02 (1998) |
zsh (1994) |
\xNN |
2.02 (1998) |
zsh (1994 or earlier) |
(( )) |
2.0 (1996) |
ksh (1980s) |
arrays |
2.0 (1996) |
ksh (1980s) |
$'...' (new quoting syntax) |
2.0 (1996) |
ksh93 (1993) |
List of bash releases and other notable events
Release |
Date |
bash-4.4 |
|
Shellshock patches are released for bash-2.05b through bash-4.3 |
2014-09-24 to 2014-10-05 |
bash-4.3 |
|
bash-4.2 |
|
bash-4.1 |
|
bash-4.0 |
|
bash-3.2 |
|
bash-3.1 |
|
bash-3.0 |
|
bash-2.05b |
|
bash-2.05a |
|
bash-2.05 |
|
bash-2.04 |
http://ftp.gnu.org/gnu/bash puts it around 2000-03-21 |
bash-2.03 |
|
bash-2.02 |
|
bash-2.01 |
|
bash-2.0 |
|
bash-1.14 |
|
bash-1.13 |
|
Looks like Chet Ramey takes over as maintainer between 1.12 and 1.13 |
|
bash-1.12 |
|
bash-1.11 |
|
bash-1.10 |
First mention found at 1991-10-07, so some time before that |
bash-1.09 |
First mention found at 1991-06-02 |
bash-1.08 |
|
bash-1.07 |
likely 1991-02-01 |
bash-1.06 |
This is a tough one. There was apparently a "bootleg" version of 1.06, so this requires more digging |
bash-1.05 |
|
bash-1.04 |
First mention found at 1989-11-07 |
bash-1.03 |
|
bash-1.02 |
First mention found at 1989-07-09 |
bash-1.01 |
|
bash-1.00 |
Hard to search for ... |
bash-0.99 |
First mention found at 1989-06-11 |