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#REDIRECT [[rc (Unix shell)#es]]
{{Infobox programming language
| name = es
| logo =
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| caption =
| designer = Byron Rakitzis, Paul Haahr
| released = 1993
| latest_release_version = 0.9-beta1
| latest_release_date = 1997
| latest_preview_version =
| latest_preview_date =
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| operating_system =
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| language =
| status =
| influenced_by = [[Rc]]
| genre = [[Unix shell]]
| source_model = [[Open source]]
| operating_system = [[Unix]]
| license = [[Public Domain]]
| website = http://hawkwind.utcs.utoronto.ca:8001/mlists/es.html
'''es''' (extensible shell)<ref>http://manpages.ubuntu.com/manpages/hardy/man1/es.1.html</ref> is a [[command line interpreter]] developed by Byron Rakitzis and Paul Haahr, that uses a [[scripting language]] syntactically similar to the [[rc shell]] of the [[Plan 9 from Bell Labs|Plan 9]] [[operating system]]<ref>http://foldoc.org/Extensible+Shell</ref>, and was originally based on code from Byron Rakitzis's clone of [[rc shell|rc]] for Unix.<ref>http://luv.asn.au/overheads/shells-talk.html</ref> It is intended to provide a fully [[functional programming|functional]] [[programming language]] as a [[Unix shell]].<ref>http://nnc3.com/lj/LJ/LJ12/0062.html</ref> The bulk of es development occurred in the early 1990s, after the shell was introduced at the Winter 1993 [[USENIX]] conference in [[San Diego]].<ref>[http://www.webcom.com/~haahr/es/es-usenix-winter93.html Es: A shell with higher-order functions] by Byron Rakitzis, [[NetApp|NetApp, Inc]], and Paul Haahr, [[Adobe Systems Incorporated]]</ref>
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Current official releases appear to have ceased with the release of 0.9-beta1 in 1997<ref>ftp://ftp.sys.utoronto.ca/pub/es/</ref>, and standard es lacks some features compared to more popular shells such as [[zsh]] and [[bash]] <ref>http://www.faqs.org/faqs/unix-faq/shell/shell-differences/</ref>, but unofficial development has been continued with [http://web.archive.org/web/20070626160532/http://theorie1.physik.uni-erlangen.de/rogalsky/es/es.html job control and history patches] and a more ambitious fork, [http://github.com/frytvm/XS Xs] (including syntax changes and C++ code).
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==See also==
*[[rc|rc shell]]
*[[Comparison of command shells]]
*[[Command line interface]]
==References==
{{reflist}}
==External links==
*[http://hawkwind.utcs.utoronto.ca:8001/mlists/es.html Official website]
*[ftp://ftp.sys.utoronto.ca/pub/es/ FTP archive for the es shell] Includes mailing list archives
*[http://web.archive.org/web/20070626160532/http://theorie1.physik.uni-erlangen.de/rogalsky/es/es.html job control patch]
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{{Unix Shells}}
[[Category:Unix shells]]
[[de:Es (Shell)]]
[[el:Κέλυφος Es]]
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