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BASH is an acronym for Bourne Again SHell. It is a command interpreter (shell) from the GNU Project, and is widely used on Linux (and, to a lesser extent, Unix) systems. It is similar to the Korn Shell (ksh), and provides a superset of the functionality of the Bourne Shell (sh).

Since BASH is the default shell on (almost all) Linux systems, it is commonly used for scripting: