Category:UNIX Shell: Difference between revisions
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[[Category:Solutions by Programming Language]]
The '''UNIX Shell''' is a component of terminal-based UNIX-derived systems which offers both a command-line interface for running system commands, as well as programming interface for intelligently automating tasks which use system commands.
=Implementation=
The UNIX Shell may be implemented by any of a wide variety of programs. Notable programs used as shells include the [[Bourne SHell]], the [[Korn SHell]], and the [[Bourne Again SHell]].
=Language=
While UNIX Shells vary in the programming languages they support, such languages carry a minimum set of features. Each language allows the programmer to execute system commands as though he were typing the commands himself, and each language allows for a header line which specifies which shell implementation is used to interpret the script.
This one tells the operating system to use the [[Bourne SHell]]:
#!/bin/sh
This line tells the operating system to use the [[Bourne Again SHell]]:
#!/bin/bash
And this one tells the operating system to use the [[Korn SHell]]:
#!/bin/ksh
Each header line consists of a hash, a bang, and the path to the interpreter binary.
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