KornShell

AT&amp;T KornShell: Eclipse Public License
pdksh: <a href="Public_domain_software" class="mw-redirect" title="Public domain software">Public domain with some ISC -like code
mksh: MirOS Licence
dtksh: Eclipse Public License with some LGPL

ksh93u+m
ksh93u+m
Developers	Martijn Dekker, Johnothan King, hyenias
Stable release	1.0.10 / August 2, 2024
Predecessor	93u+
License	Eclipse Public License
Website	github.com/ksh93/ksh/wiki
Repository	github.com/ksh93/ksh

ksh2020
ksh2020
Developers	Kurtis Rader, Siteshwar Vashisht, community
Final release	2020 / October 10, 2019
Predecessor	93v-
License	Eclipse Public License
Website	kornshell.com
Repository	github.com/ksh2020/ksh

KornShell
KornShell
	Interaction with OpenBSD's default shell, pdksh
Original author	David Korn
Initial release	1983
Final release	93u+ / August 1, 2012
Preview release	93v- / December 24, 2014
Written in	C
Operating system	Unix and Unix-like (e.g. Linux and macOS; also works in Windows 10)
Available in	English
Type	Unix shell
License	AT&T KornShell: Eclipse Public License; pdksh: Public domain with some ISC-like code; mksh: MirOS Licence; dtksh: Eclipse Public License with some LGPL;
Website	kornshell.com
Repository	github.com/att/ast

KornShell (ksh) is a Unix shell which was developed by David Korn at Bell Labs in the early 1980s and announced at USENIX on July 14, 1983. The initial development was based on Bourne shell source code. Other early contributors were Bell Labs developers Mike Veach and Pat Sullivan, who wrote the Emacs and vi-style line editing modes' code, respectively. KornShell is backward-compatible with the Bourne shell and includes many features of the C shell, inspired by the requests of Bell Labs users.