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Bash (Unix shell)

Bash
Gnu-bash-logo.svg
Bash screenshot.png
Screenshot of a Bash session
Original author(s) Brian Fox
Initial release June 8, 1989; 27 years ago (1989-06-08)
Stable release
4.4.5 / November 16, 2016; 2 months ago (2016-11-16)
Repository git.savannah.gnu.org/cgit/bash.git
Written in C
Operating system
Platform GNU
Available in Multilingual (gettext)
Type Unix shell, command language
License GNU GPL v3+
Website www.gnu.org/software/bash/

Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. First released in 1989, it has been distributed widely as the default shell for Linux distributions and Apple's macOS (formerly OS X). In 2016 it was also made available by Microsoft for use in Windows 10 Anniversary Update, albeit not installed by default.

Bash is a command processor that typically runs in a text window, where the user types commands that cause actions. Bash can also read commands from a file, called a script. Like all Unix shells, it supports filename globbing (wildcard matching), piping, here documents, command substitution, variables and control structures for condition-testing and iteration. The keywords, syntax and other basic features of the language are all copied from sh. Other features, e.g., history, are copied from csh and ksh. Bash is a POSIX shell, but with a number of extensions.


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