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{{implementation|UNIX Shell}}'''bash''' (the "Bourne Again SHell") is the GNU implementation of a [[Unix]] shell which is intended to be compatible with the original UNIX [[Bourne Shell]] (/bin/sh) by [[wp:Stephen R. Bourne|Stephen R. Bourne]]. ''bash'' was primarily written and is maintained by [[wp:Brian Fox (computer programmer)|Brian Fox]] and Chet Ramey. The name follows a [[wp:Free Software Foundation|Free Software Foundation]] tradition for whimsical and pun-referential names.

In functionality ''bash'' goes well beyond the original Bourne shells and closely matches the extensions of David Korn's "[[Korn Shell]]" (''ksh''), though ''bash'' and ''ksh'' use different syntax to create a coprocess or an associative array. ''bash'' also adds a number of interactive features drawn from Bill Joy's [[C Shell]] (including the many "bang expansion operators" for things like !! (expand to entire previous command), !-2 (expand to penultimate command), !$ (expand to last argument of previous command) etc).

* [http://www.gnu.org/software/bash/ GNU Bash homepage]
* [http://tldp.org/LDP/abs/html/ Advanced Bash-Scripting Guide]
* [[wp:Bash (Unix shell)|Bash]] on Wikipedia