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Line 34: ===es=== ''es'' (for "extensible shell") is an [[open source]], [[command line interpreter]] developed by Rakitzis and Paul Haahr<ref>{{cite book \| url=https://books.google.com/books?id=iEK6eQQwOF0C&pg=PA43~~&redir_esc=y#v=onepage&q&f=false~~ \| title=Spatial Analytical Perspectives on GIS\| isbn=9780748403400\| last1=Fischer\| first1=Manfred M.\| date=13 December 1996}}</ref> that uses a [[scripting language]] syntax influenced by the rc 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 \|url-status=dead \|archiveurl=https://web.archive.org/web/20140224211945/http://manpages.ubuntu.com/manpages/hardy/man1/es.1.html \|archivedate=2014-02-24 }}</ref><ref>{{cite web \| url=http://foldoc.org/Extensible+Shell \|title=Extensible Shell \|publisher=FOLDOC \|date= \|accessdate=2012-08-24}}</ref> It 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><ref>{{cite web\|last=Jones\|first=Tim\|title=Evolution of shells in Linux\|url=http://www.ibm.com/developerworks/library/l-linux-shells/\|publisher=IBM\|accessdate=14 March 2014}}</ref> Extensible shell 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\|accessdate=2012-08-24\|url-status=dead\|archiveurl=https://web.archive.org/web/20130117064248/http://nnc3.com/lj/LJ/LJ12/0062.html\|archivedate=2013-01-17}}</ref> It does so by introducing "program fragments" in braces as a new datatype, lexical scoping via [[Let expression\|let]], and some more minor improvements. 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://stuff.mit.edu/afs/sipb/user/yandros/doc/es-usenix-winter93.html Es: A shell with higher-order functions] by Byron Rakitzis, [[NetApp\|NetApp, Inc]], and Paul Haahr, [[Adobe Systems Incorporated]]; <u>Archived</u> at [https://web.archive.org/web/20090415213858/http://192.220.96.201/es/es-usenix-winter93.html Archive.Org].</ref> Official releases appear to have ceased after 0.9-beta-1 in 1997,<ref>[ftp://ftp.sys.utoronto.ca/pub/es/ ]</ref> and es lacks features as compared to more popular shells, such as [[zsh]] and [[Bash (Unix shell)\|bash]].<ref>{{cite web \| url=http://www.faqs.org/faqs/unix-faq/shell/shell-differences/ \|title=UNIX shell differences\| publisher=Faqs.org \|date= \| accessdate=2012-08-24}}</ref> A [[public ___domain]] fork of {{code\|es}} is active as of 2019.<ref>{{cite web \|last1=Haggerty \|first1=James \|title=wryun/es-shell: a shell with higher-order functions \|url=http://wryun.github.io/es-shell/ \|website=GitHub \|date=13 March 2020}}</ref>

Rc (Unix shell): Difference between revisions