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TYPE OF UNIX SHELL

Korn Shell; Pdksh; Kornshell; Ksh93; Ksh88; Mksh; Korn shell

pdksh

Version 4.9 interpreter Simon J. Gerraty <sjg@zen.void.oz.au> comp.sources.misc volume 4 It is not intended to be the ultimate shell but rather a usable ksh work alike. conformance: Almost identical to ksh88, but missing arrays E-mail: Simon J Gerraty <sjg@melb.bull.oz.au> (zen.void.oz.au is down) ports: Sun, 386bsd, ? 1993-10-11

Korn Shell

(ksh) A command interpreter for Unix. SKsh is an AmigaDos-specific version and pdksh is a free Unix version. [More details?]

ويكيبيديا

KornShell

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.

https://en.wikipedia.org/wiki/KornShell