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Bash, an abbreviation for Bourne Again SHell, is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. It incorporates features from both the Korn shell (ksh) and C shell (csh) and is intended to be compatible with sh to encourage scripts written in these languages to be migrated. Bash can also read and execute commands from input files or standard input. Shell scripting lets users interact with a computer's operating system through text-based commands, making it an essential tool for system administrators, developers, and power users on Linux.

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