Info Node: ( is Bash?

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1.1 What is Bash?

Bash is the shell, or command language interpreter, for the GNU
operating system.  The name is an acronym for the 'Bourne-Again SHell',
a pun on Stephen Bourne, the author of the direct ancestor of the
current Unix shell 'sh', which appeared in the Seventh Edition Bell Labs
Research version of Unix.

   Bash is largely compatible with 'sh' and incorporates useful features
from the Korn shell 'ksh' and the C shell 'csh'.  It is intended to be a
conformant implementation of the IEEE POSIX Shell and Tools portion of
the IEEE POSIX specification (IEEE Standard 1003.1).  It offers
functional improvements over 'sh' for both interactive and programming

   While the GNU operating system provides other shells, including a
version of 'csh', Bash is the default shell.  Like other GNU software,
Bash is quite portable.  It currently runs on nearly every version of
Unix and a few other operating systems - independently-supported ports
exist for MS-DOS, OS/2, and Windows platforms.

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