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sh is a common UNIX shell or "Command Language Interpreter" (quoth "man shell")

Originally, this was the Bourne shell (named for its author Steve Bourne,) which was the default shell for Unix beginning with Version 7. It was proprietary to AT&T, which caused to to be cloned, extended and generalized in various ways. Nowadays, the /bin/sh entry is usually a link (hard or soft) to some other descendant shell which will respond by behaving as nearly like its illustrious ancestor as possible.

Several shells have normally gone by the name sh, including its predecessor the Thompson shell and derivatives ash, ksh (the Korn shell), and bash (the Bourne-again shell) bash.

see also

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