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Bash (Bourne Again Shell) is the free and enhanced version of the Bourne shell distributed with Linux and GNU [operating systems]. Bash is similar to [the original], but has added features such as command-line editing. Created to improve on the earlier Bourne shell (named sh), Bash includes features from the Korn shell and the C shell. Bash is intended to conform to the shell standard specified as part of IEEE POSIX. A command language script written for the Bourne shell should also run in the bash shell. Bash is released under the GNU [General Public] License (GPL), and it is available for most versions of Unix and Linux and versions have been ported to MS-DOS and Windows. As explained in the Bash Reference Manual, the name bash is an acronym of "Bourne-again SHell" which is a pun on Stephen Bourne, author of the Bourne shell. Bash is a superset of the earlier shell, and generally compatible with Bourne shell programs.
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