<> == Is there a list of which features were added to specific releases (versions) of Bash? == Here are some links to official Bash documentation: * [[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 A more extensive list than the one below can be found at https://web.archive.org/web/20230401195427/https://wiki.bash-hackers.org/scripting/bashchanges === Changes in the upcoming bash-5.3 release === ||'''Feature''' ||'''Copied from / Inspired by''' || || ${ CMDS;} || ksh93 || || ${|CMDS;} || mksh || || GLOBSORT (variable) || zsh's o/O glob qualifiers || || local BASH_REMATCH || || || compgen -V ||native || || read -E || || || array_expand_once (shopt) || || || printf %#Q %#q (${var@Q} quoting) || zsh's q, qq, qqq, qqqq, q+, q- parameter expansion flags || || printf %l.*s %lc (character aware %s %c) || zsh's default for %s, ksh93's %Ls/%Lc || === Notable changes in released bash versions === ||'''Feature''' ||'''Added in version''' ||'''Copied from / Inspired by''' || || READLINE_ARGUMENT (variable) || 5.2 (2022) || zsh's NUMERIC variable || || varredir_close (shopt) || 5.2 (2022) || || || printf %Q || 5.2 (2022) || || || noexpand_translations (shopt) || 5.2 (2022) || || || ${var@k} || 5.2 (2022) || zsh's ${(kv)var} || || ${var/$pat/&}, patsub_replacement (shopt) || 5.2 (2022) || ksh93's \0, zsh's $MATCH || || globskipdots (shopt) || 5.2 (2022) || || ||BASH_REMATCH is no longer readonly || 5.1 (2020) || || ||PROMPT_COMMAND may be an array || 5.1 (2020) || zsh's precmd_functions array || ||SRANDOM (variable) || 5.1 (2020) || || ||wait -p varname || 5.1 (2020) || || ||declare -I || 5.1 (2020) || NetBSD sh (default behaviour in ash) || ||${var@U}, ${var@u}, ${var@L}, ${var@K} || 5.1 (2020) || zsh's U, L, C, kv parameter expansion flags, zsh/tcsh's :u, :l modifiers || ||BASH_ARGV0 (variable) || 5.0 (2019) || || ||EPOCHSECONDS, EPOCHREALTIME (variables) ||5.0 (2019) ||zsh (2003, 2011) || ||wait -f ||5.0 (2019) || || ||history -d allows negative offsets ||5.0 (2019) || || ||assoc_expand_once (shopt) ||5.0 (2019) || || ||localvar_inherit (shopt) ||5.0 (2019) || || ||--pretty-print (invocation option) ||5.0 (2019) ||native || ||assoc=(key1 value1 key2 value2) assoc+=(key value) || 5.0 (2019) || || ||PS0 (variable) ||4.4 (2016) ||native || ||[[BashLoadableBuiltins|loadable builtin]] deployment infrastructure ||4.4 (2016) ||ksh93 (1993) || ||mapfile/readarray -d ||4.4 (2016) ||native || ||--help for builtins ||4.4 (2016) ||ksh93 (2001, possibly earlier) || ||${var@a}, ${var@A}, ${var@E}, ${var@P}, ${var@Q}||4.4 (2016) ||mksh (2012) for the syntax, zsh (1990s) for the feature || ||local - ||4.4 (2016) ||Almquist shell (1989) || ||$! and wait for process substitutions ||4.4 (2016) ||native || ||wait -n ||4.3 (2014) ||native || ||test -R ||4.3 (2014) ||ksh93 (1993) || ||test -v 'array[element]' (bug fix) ||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) || ||printf %(fmt)T uses -1 as default argument instead of 0 ||4.3 (2011) ||ksh93 (1999) || ||quotes in the replacement part of ${var/pat/"$rep"} are no longer literal ||4.3 (2011) || || ||\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 ${var:start:-len} ||4.2 (2011) ||zsh (1990s) and native || ||lastpipe (shopt) ||4.2 (2011) ||ksh (1980s) default behaviour there || ||read -N ||4.1 (2010) ||ksh93 (2003) || ||{var}> or {var}< etc. (FD variable assignment) ||4.1 (2010) ||developed jointly with ksh93 and zsh || ||syslog history (compile option) ||4.1 (2010) ||native || ||complete -D (allowing dynamically loaded completions) ||4.1 (2010)|| || ||BASH_XTRACEFD (variable) ||4.1 (2010) ||native || ||${@:offset[:length]} includes $0 ||4.0 (2009) ||ksh || ||;& and ;;& fall-throughs for case ||4.0 (2009) ||ksh93 (1993) || ||associative arrays ||4.0 (2009) ||ksh93 (1993) || ||&>> and |& ||4.0 (2009) ||native and csh (1970s) || ||command_not_found_handle (function) ||4.0 (2009) ||native || ||compopt (builtin) || 4.0 (2009) || || ||coproc (keyword) ||4.0 (2009) ||ksh (1980s), zsh (1990) for the coproc keyword || ||globstar (shopt) ||4.0 (2009) ||zsh (1992), ksh93 (2005) for the name of the option || ||mapfile/readarray (builtin) ||4.0 (2009) ||native || ||${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 || ||BASH_REMATCH ||3.0 (2004) ||native || ||RETURN (trap) ||3.0 (2004) ||native || ||pipefail (option) ||3.0 (2004) ||ksh93 || ||failglob (shopt) ||3.0 (2004) ||native || ||printf %q produces $'...' ||2.05b (2002) ||ksh93 (1993) || ||[n]>&word- and [n]<&word- ||2.05b (2002) ||ksh93 || ||<<< ||2.05b (2002) ||zsh (1991) || ||printf %n ||2.05a (2001) ||ksh93 || ||i++ ||2.04 (2000) ||ksh93 (1993) || ||for ((;;)) ||2.04 (2000) ||ksh93 (1993) || ||/dev/fd/N, /dev/tcp/host/port, etc. ||2.04 (2000) ||ksh93 (1993) || ||read -t, -n, -d and -s ||2.04 (2000) ||ksh93 (1993) || ||a=(*.txt) file expansion ||2.03 (1999) ||ksh93 (1993) || ||extglob (shopt) ||2.02 (1998) ||ksh (1980s) || ||[[ ||2.02 (1998) ||ksh (1980s) || ||printf (builtin) ||2.02 (1998) ||ksh (1980s) || ||$(< filename) ||2.02 (1998) ||ksh (1980s) || ||** (exponentiation) ||2.02 (1998) ||zsh (1994) || ||\xXX ||2.02 (1998) ||zsh (1994 or earlier) || ||(( )) ||2.0 (1996) ||ksh (1980s) || ||arrays ||2.0 (1996) ||csh (1979), zsh (1991) for array=(assignment) syntax || ||$'...' (new quoting syntax) ||2.0 (1996) ||ksh93 (1993) || === List of bash releases and other notable events === ||'''Release''' ||'''Date''' || ||bash-5.2 ||[[https://lists.gnu.org/archive/html/bug-bash/2022-09/msg00056.html|2022-09-26]] || ||bash-5.1 ||[[https://lists.gnu.org/archive/html/bug-bash/2020-12/msg00002.html|2020-12-07]] || ||bash-5.0 ||[[http://lists.gnu.org/archive/html/bug-bash/2019-01/msg00063.html|2019-01-07]] || ||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]] || ||||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 beta release [[https://groups.google.com/g/gnu.announce/c/hvhlR1Vn1P0/m/NYwp-4_0CaUJ|1989-06-07]] ||