Almquist Shell

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Revision as of 04:34, 7 October 2011 by rosettacode>Kernigh (Give a brief description. List the three major variants.)
Almquist Shell is an implementation of UNIX Shell. Other implementations of UNIX Shell.

Almquist Shell is a minimal implementation of a POSIX shell, and also a replacement for Bourne Shell. Almquist Shell has more features than Bourne Shell, but fewer features than most other shells. (No arrays!) Almquist Shell only implements POSIX features, plus a few BSD traditions, like its local command. Almquist Shell is the default shell, /bin/sh, of some systems.

Almquist Shell filled the need for a free shell to replace Bourne Shell. Kenneth Almquist posted the first version of Ash to Usenet group comp.sources.unix at 30 May 1989. It was a clone of SVR3 Bourne Shell. BSD used Ash for /bin/sh, added features from POSIX, and put a Berkeley copyright on this shell.

Almquist variants

Ash has three major variants:

All three variants have similar features. Dash can run on GNU/Linux.

See also

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