Korn Shell: Difference between revisions
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(This shell combines Bourne Shell syntax with several more features. Show how to identify ksh93, pdksh, mksh or zsh.) |
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{{implementation|UNIX Shell}} |
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'''Korn Shell''', or ''ksh'', is the creation of David Korn at AT&T. This shell combines [[Bourne Shell]] syntax with a command-line editor, command history, tilde expansion, arithmetic expressions, arrays, coprocesses and several more features. Korn Shell has influenced many later shells; [[Public Domain Korn Shell]] and [[Z Shell]] clone several features, and the X/Open and POSIX standards take a few features from Korn Shell. David Korn continues to maintain [[ksh93]], the original implementation. |
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AT&T freed ksh93 during 2000, using an open-source license. For many years before that, the original Korn Shell was not free; it was only part of AT&T System V and some commercial Unix variants. Therefore, ''ksh'' in some systems is not David Korn's shell, but is some other shell, perhaps ''pdksh'' or [[MirBSD Korn Shell|''mksh'']]. |
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== Which Korn Shell do I have? == |
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Start ''ksh'' and run |
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<lang bash>$ echo $KSH_VERSION</lang> |
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* If the output looks like <code style="background: yellow;">Version JM 93u 2011-02-08</code>, then you have ''[[ksh93]]''. |
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* If the output looks like <code style="background: yellow;">@(#)PD KSH v5.2.14 99/07/13.2</code>, then you have ''[[pdksh]]''. |
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* If the output looks like (what?), then you have ''[[mksh]]''. |
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* A ''[[zsh]]'' invoked as ''ksh'' sets ZSH_VERSION, not KSH_VERSION. |
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== Links == |
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* [http://www.kornshell.com/ Home Page For The KornShell Command And Programming Language] |
* [http://www.kornshell.com/ Home Page For The KornShell Command And Programming Language] |
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* [[wp:korn shell]] |
* [[wp:korn shell]] |
Revision as of 00:22, 13 September 2011
Korn Shell, or ksh, is the creation of David Korn at AT&T. This shell combines Bourne Shell syntax with a command-line editor, command history, tilde expansion, arithmetic expressions, arrays, coprocesses and several more features. Korn Shell has influenced many later shells; Public Domain Korn Shell and Z Shell clone several features, and the X/Open and POSIX standards take a few features from Korn Shell. David Korn continues to maintain ksh93, the original implementation.
AT&T freed ksh93 during 2000, using an open-source license. For many years before that, the original Korn Shell was not free; it was only part of AT&T System V and some commercial Unix variants. Therefore, ksh in some systems is not David Korn's shell, but is some other shell, perhaps pdksh or mksh.
Which Korn Shell do I have?
Start ksh and run
<lang bash>$ echo $KSH_VERSION</lang>
- If the output looks like
Version JM 93u 2011-02-08
, then you have ksh93. - If the output looks like
@(#)PD KSH v5.2.14 99/07/13.2
, then you have pdksh. - If the output looks like (what?), then you have mksh.
- A zsh invoked as ksh sets ZSH_VERSION, not KSH_VERSION.