Basic Shell Programming

The most popular Linux shell is bash. This stands for Bourne Again Shell, and is named after one of the original UNIX shell designers. bash has a lighter relative, ash, which lacks some features such as command-line histories, but requires substantially less memory and is therefore found in some Linux distributions and on emergency recovery disks. Clones of the standard UNIX shells, sh (the Bourne shell), csh (the c shell), and ksh (the Korn shell) are also available.

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