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| website = http://hawkwind.utcs.utoronto.ca:8001/mlists/es.html
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'''es''' (extensible shell)<ref>{{cite web|url=http://manpages.ubuntu.com/manpages/hardy/man1/es.1.html |title=Ubuntu Manpage: es - extensible shell |publisher=Manpages.ubuntu.com |date=1992-03-05 |accessdate=2012-08-24}}</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>{{cite web|url=http://foldoc.org/Extensible+Shell |title=Extensible Shell |publisher=FOLDOC |date= |accessdate=2012-08-24}}</ref> and was originally based on code from Byron Rakitzis's clone of [[rc shell|rc]] for Unix.<ref>{{cite web|url=http://luv.asn.au/overheads/shells-talk.html |title=Shells Available for Linux |publisher=LUV |date= |accessdate=2012-08-24}}</ref> It is intended to provide a fully [[functional programming|functional]] [[programming language]] as a [[Unix shell]].<ref>{{cite web|url=http://nnc3.com/lj/LJ/LJ12/0062.html |title=Linux Journal 12: What's GNU |date= |accessdate=2012-08-24}}</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>
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]]
==See also==
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