Almquist Shell: Difference between revisions
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All three variants have similar features. Dash can run on GNU/Linux.
Ash is also the shell provided by [[BusyBox]].
== See also ==
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Revision as of 15:11, 9 November 2014
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.
If a script works with Almquist Shell, it will probably also work with bash, pdksh and zsh. Further, it will probably work with ksh93 unless it uses local
, which ksh93 lacks.
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.
Ash is also the shell provided by BusyBox.
See also
- Almquist shell, Wikipedia's article
- Ash (Almquist Shell) Variants, a history of many Ash versions and their features