Bash is a POSIX-compliant shell, but with a number of extensions. Other features, e.g., history, are copied from csh and ksh. The keywords, syntax, dynamically scoped variables and other basic features of the language are all copied from sh. Like most Unix shells, it supports filename globbing (wildcard matching), piping, here documents, command substitution, variables, and control structures for condition-testing and iteration. Bash can also read and execute commands from a file, called a shell script. īash is a command processor that typically runs in a text window where the user types commands that cause actions. Bash was also the default shell in versions of Apple macOS from 10.3 (originally default shell was tcsh) to the 2019 release of macOS Catalina, which changed the default shell to zsh, although Bash remains available as an alternative shell. It is also the default user shell in Solaris 11. A version is also available for Windows 10 via the Windows Subsystem for Linux. Bash was one of the first programs Linus Torvalds ported to Linux, alongside GCC. First released in 1989, it has been used as the default login shell for most Linux distributions. macOS ( GPL-2.0-or-later GPL-3.0-or-later available through third parties)Ġ.99? to 1.05?: GPL-1.0-or-later īash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell.
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