Somewhere around 1989, Brian Fox created Bash as a free software substitute for the Bourne shell for the GNU Project. It is a command processor, usually running in a text window, where the user can write commands that cause actions. Bash can also read and execute commands from shell script files. It supports filename globbing (wildcard matching), piping, here documents, command substitution, variables, and control structures for conditional testing and iteration, as do other Unix shells.
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