Editing KornShell (section)

{{Short description|Bourne shell backward compatible Unix shell created by David Korn}}
{{Infobox software
| name         = KornShell
| screenshot   = OpenBSD ksh Interaction.png
| screenshot size = 250px
| caption      = Interaction with [[OpenBSD]]'s default shell, {{mono|pdksh}}
| author       = [[David Korn (computer scientist)|David Korn]]
| released     = {{Start date and age|1983}}<ref name=Gomes>{{Cite newsgroup
 | author      = Ron Gomes
 | title       = Toronto USENIX Conference Schedule (tentative)
 | date        = Jun 9, 1983
 | newsgroup   = net.usenix
 | url         = http://groups.google.com/group/net.usenix/msg/fa6e1f7de3b63bba?hl=en
 | access-date = Dec 29, 2010
 }}</ref><ref name=Harris>{{Cite newsgroup
 | author      = Guy Harris
 | title       = csh question
 | date        = Oct 10, 1983
 | newsgroup   = net.flame
 | url         = http://groups.google.com/group/net.flame/msg/4f868085b65af530?hl=en
 | access-date = Dec 29, 2010
 }}</ref>
| latest release version = 93u+
| latest release date    = {{start date and age|2012|08|01}}
| latest preview version = 93v-
| latest preview date    = {{start date and age|2014|12|24}}
| programming language   = [[C (programming language)|C]]
| operating system       = [[Unix]] and [[Unix-like]] (e.g. [[Linux]] and [[macOS]]; also works in [[Windows Subsystem for Linux|Windows 10]]<ref>{{Cite web|title=Korn Shell Launcher for Windows Subsystem for Linux « Musings|url=https://blog.fpmurphy.com/2016/05/korn-shell-launcher-for-windows-subsystem-for-linux-2.html|access-date=2021-01-29|website=blog.fpmurphy.com}}</ref>)
| platform               =
| language               = English
| genre                  = [[Unix shell]]
| license                = {{plainlist|
* '''AT&T KornShell''': [[Eclipse Public License]]<ref name="ksh93epl">{{cite web |url=http://www2.research.att.com/~astopen/download/gen/ast-open.html |archive-url=https://web.archive.org/web/20151001051730/http://www2.research.att.com/~astopen/download/gen/ast-open.html |archive-date=October 1, 2015 |title=ast-open package |author=<!--Not stated--> |date=n.d. |publisher=AT&T Research |access-date=December 19, 2022}}</ref>
* '''pdksh''': [[public domain software|Public domain]] with some [[ISC License|ISC]]-like code<ref name="pdksh_LEGAL">{{cite web |url=http://www.cs.mun.ca/~michael/pdksh/LEGAL |title=LEGAL |access-date=2010-06-10 |url-status=dead |archive-url=https://web.archive.org/web/20120206143309/http://www.cs.mun.ca/~michael/pdksh/LEGAL |archive-date=2012-02-06 }}</ref>
* '''mksh''': [[MirOS Licence]]<ref name="mkshlicense">{{cite web|url=https://www.mirbsd.org/mksh.htm|title=MirBSD Korn Shell|website=Mirbsd.org|access-date=10 December 2018}}</ref>
* '''dtksh''': [[Eclipse Public License]] with some [[LGPL]]
  }}
| website                = {{Official URL}}
| repo                   = {{URL|github.com/att/ast}}
| discontinued           = yes
}}

{{Infobox software
| name                   = ksh2020
| developer              = Kurtis Rader, Siteshwar Vashisht, community
| latest release version = 2020
| latest release date    = {{Start date and age|2019|10|10}}
| repo                   = {{URL|github.com/ksh2020/ksh}}
| discontinued           = yes
| replaces               = 93v-
| license                = [[Eclipse Public License]]
| website                =
}}

{{Infobox software
| name = ksh93u+m
| developer = Martijn Dekker, Johnothan King, hyenias
| latest release version = 1.0.10
| latest release date = {{Start date and age|2024|08|02}}
| repo = {{URL|github.com/ksh93/ksh}}
| website = {{URL|github.com/ksh93/ksh/wiki}}
| discontinued = no
| replaces = 93u+
| license = [[Eclipse Public License]]
}}

'''KornShell<!-- sic! -->''' (<code>'''ksh'''</code>) is a [[Unix shell]] which was developed by [[David Korn (computer scientist)|David Korn]] at [[Bell Labs]] in the early 1980s and announced at [[USENIX Annual Technical Conference|USENIX]] on July 14, 1983.<ref name=Gomes/><ref name=Harris/>  The initial development was based on [[Bourne shell]] source code.<ref>
{{citation
| title = ksh - An Extensible High Level Language
| last = Korn
| first = David G.
| publisher = USENIX Association
| journal=Proceedings of the USENIX 1994 Very High Level Languages Symposium
| date = October 26, 1994
| url = https://www.usenix.org/legacy/publications/library/proceedings/vhll/full_papers/korn.ksh.a
| quote = Instead of inventing a new script  language,  we  built  a  form  entry system  by  modifying  the  Bourne  shell,  adding  built-in commands as necessary.
| access-date = February 5, 2015
}}</ref>  Other early contributors were Bell Labs developers Mike Veach and Pat Sullivan, who wrote the [[Emacs]] and [[Vi (text editor)|vi]]-style line editing modes' code, respectively.<ref>{{Cite book
  | last1 = Bolsky
  | first1 = Morris I.
  | last2 = Korn
  | first2 = David G.
  | title = The KornShell Command and Programming Language
  | publisher = Prentice Hall
  | year = 1989
  | location = Englewood Cliffs, NJ
  | chapter = Acknowledgements
  | pages = xii
  | url = https://archive.org/details/kornshellcommand00bols
  | isbn = 0-13-516972-0
  }}</ref> KornShell is backward-compatible with the Bourne shell and includes many features of the [[C shell]], inspired by the requests of Bell Labs users.