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{{implementation cat|UNIX Shell}}
There are many [[UNIX Shell]]s and most of them
== Bourne-compatible shells ==
Common Bourne compatible shells include
* the original [[Bourne Shell]] (''/bin/sh'' on most versions of [[UNIX]]),
* the [[GNU]] [[Bourne Again SHell]] (''bash'' --- which is linked to ''/bin/sh'' on many distributions of [[Linux]], making it their default shell),
* the [[Korn Shell]] (''ksh''),
* the [[Public Domain Korn SHell]] (''pdksh'' --- which is ''/bin/ksh'' on some systems, ''/bin/sh'' on [[OpenBSD]]),
* the [[MirBSD Korn Shell]] (''mksh'' -- which is ''/bin/sh'' on some systems)
* the [[Almquist SHell]] (''ash'' --- which is ''/bin/sh'' on some systems),
* the [[Debian Almquist SHell]] (''dash''),
* and the [[Z SHell]] (''zsh'').
=== Comparison table ===
{| class="wikitable"
! Feature
! Bourne ''sh''
! ''ash, dash''
! ''pdksh, mksh''
! ''bash''
|-
! Manual page
| [http://heirloom.sourceforge.net/sh/sh.1.html Heirloom sh]
|
* [http://netbsd.gw.com/cgi-bin/man-cgi?sh++NetBSD-current NetBSD sh]
* [http://man.cx/dash dash]
|
* [http://www.openbsd.org/cgi-bin/man.cgi?query=ksh&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html OpenBSD ksh]
* [http://www.mirbsd.org/htman/i386/man1/mksh.htm mksh]
| [http://man.cx/bash bash]
|-
| <tt> `''command''`</tt>
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>''func''() { ''list''; }</tt>
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>[ -n "$''param''" ]</tt>
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>''PARAM''=''value''<br />export ''PARAM''</tt>
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>export ''PARAM''=''value''</tt>
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>local ''param''</tt>
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>${''param''##*/}<br />${''param''%/*}</tt>
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>ls ~</tt>
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>$(''command'')</tt>
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>$(( ''i = 2 + 3'' ))</tt>
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
| <tt>(( ''i = 2 + 3'' ))</tt>
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
|-
| <tt><nowiki>[[</nowiki> -n $''param'' ]]</tt>
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
|-
| <tt>function ''name'' { ''list''; }</tt>
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
|-
| <tt>${''array''[''2'']}</tt>
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
|-
| <tt>set -A ''array 11 22 33''</tt>
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
|-
| <tt>''array''=(''11 22 33'')</tt>
| {{no}}
| {{no}}
| {{optional|mksh}}
| {{yes}}
|-
| <tt>$' \t\n'</tt>
| {{no}}
| {{no}}
| {{optional|mksh}}
| {{yes}}
|}
=== Portability notes ===
The original Bourne shell went through a number of revisions in the early years of UNIX, and support for some features varies considerably. By the time the SUSv3 (Single Unix Specification, version 3) features stabilized, all versions of the various Bourne-compatible shells should support a common set of features. This is denoted in Rosette Code examples with the phrase: "SUSv3" features. The Korn shell (originally written by David Korn of AT&T) and its "public domain" clone offer extensions (such as co-processes, and "associative arrays" --- called "hash arrays" by [[Perl]], "dictionaries" by [[Python]], "maps" by [[Lua]], etc).
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==Comparison of various shells==
[http://
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