KornShell

KornShell
Original author(s) David Korn
Initial release 1983[1][2]
Stable release
ksh93u+ / August 6, 2012 (2012-08-06)[3]
Repository github.com/att/ast
Development status Active
Written in C
Operating system Unix
Available in English
Type Unix shell
License
Website www.kornshell.org

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.[1][2] The initial development was based on Bourne shell source code.[7] Other early contributors were Bell Labs developers Mike Veach and Pat Sullivan, who wrote the Emacs and vi-style line editing modes' code, respectively.[8] KornShell is backward-compatible with the Bourne shell and includes many features of the C shell, inspired by the requests of Bell Labs users.

Design

KornShell complies with POSIX.2, Shell and Utilities, Command Interpreter (IEEE Std 1003.2-1992.) Major differences between KornShell and the traditional Bourne shell include:

History

Interaction with OpenBSD's default shell, pdksh

KornShell was originally proprietary software. In 2000 the source code was released under a license particular to AT&T, but since the 93q release in early 2005 it has been licensed under the Eclipse Public License.[4] KornShell is available as part of the AT&T Software Technology (AST) Open Source Software Collection. As KornShell was initially only available through a proprietary license from AT&T, a number of free and open source alternatives were created. These include pdksh, mksh, GNU bash, and zsh.

The functionality of the original KornShell, ksh88, was used as a basis for the standard POSIX.2, Shell and Utilities, Command Interpreter (IEEE Std 1003.2-1992.)

Some vendors still ship their own versions of the older ksh88 variant, sometimes with extensions. ksh93 is still maintained by its author. Releases of ksh93 are versioned by appending a letter to the name; the current version as of 16 January 2017 is ksh93u+, following ksh93u (which followed ksh93t+); ksh93v is in the beta phase (as of 16 January 2017)[10]

As "Desktop KornShell" (dtksh), ksh93 is distributed as part of the Common Desktop Environment.[11] This version also provides shell-level mappings for Motif widgets. It was intended as competitor to Tcl/Tk.[12]

The original KornShell, ksh88, became the default shell on AIX in version 4,[13][14] with ksh93 being available separately.[15]

UnixWare 7 includes both ksh88 and ksh93. The default Korn shell is ksh93, which is supplied as /usr/bin/ksh, and the older version is available as /usr/bin/ksh88.[16] UnixWare also includes dtksh when CDE is installed.

Variants

There are several software products related to KornShell:

See also

References

  1. 1 2 Ron Gomes (Jun 9, 1983). "Toronto USENIX Conference Schedule (tentative)". Newsgroup: net.usenix. Retrieved Dec 29, 2010.
  2. 1 2 Guy Harris (Oct 10, 1983). "csh question". Newsgroup: net.flame. Retrieved Dec 29, 2010.
  3. https://web.archive.org/web/20150527152858/http://www2.research.att.com/~astopen/download/notes.html
  4. 1 2 http://www2.research.att.com/~astopen/download/gen/ast-open.html
  5. 1 2 https://www.mirbsd.org/mksh.htm
  6. Korn, David G. (October 26, 1994), "ksh - An Extensible High Level Language", Proceedings of the USENIX 1994 Very High Level Languages Symposium, USENIX Association, retrieved February 5, 2015, Instead of inventing a new script language, we built a form entry system by modifying the Bourne shell, adding built-in commands as necessary.
  7. Bolsky, Morris I.; Korn, David G. (1989). "Acknowledgements". The KornShell Command and Programming Language. Englewood Cliffs, NJ: Prentice Hall. pp. xii. ISBN 0-13-516972-0.
  8. http://www.in-ulm.de/~mascheck/bourne/#variants Bourne Shell evolvement
  9. https://github.com/att/ast/blob/beta/src/cmd/ksh93/RELEASE
  10. Bill Rosenblatt; Arnold Robbins (2002). Learning the Korn Shell (2 ed.). O'Reilly Media, Inc. pp. viii–ix. ISBN 978-0-596-00195-7.
  11. J. Stephen Pendergrast (1995). Desktop KornShell graphical programming. Addison-Wesley. p. 359. ISBN 978-0-201-63375-7.
  12. Casey Cannon; Scott Trent; Carolyn Jones (1999). Simply AIX 4.3. Prentice Hall PTR. p. 21. ISBN 978-0-13-021344-0.
  13. http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.cmds/doc/aixcmds5/sh.htm
  14. http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.baseadmn/doc/baseadmndita/korn_shell_enhanced.htm
  15. http://uw714doc.sco.com/en/DIFFS/UNIX95_Conformance.html#ksh-93_vs_ksh-88
  16. https://people.debian.org/~spaillard/Debian_Release_Notes/mksh.html
  17. "David Korn Tells All". Slashdot. Retrieved 2009-10-22.
  18. "Jerry Feldman — USENIX NT/LISA NT conference attendee". Lists.blu.org. Retrieved 2009-10-22.
  19. "Windows Services for UNIX Version 3.0". Technet.microsoft.com. Retrieved 2009-10-22.
  20. Anatole Olczak (2001). The Korn shell: Unix and Linux programming manual. Addison-Wesley Professional. p. 4. ISBN 978-0-201-67523-8.

Further reading

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