Category:UNIX Shell: Difference between revisions
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=Implementation= |
=Implementation= |
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The UNIX Shell may be implemented by any of a wide variety of programs. Notable programs used as shells include the [[Bourne |
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]]. |
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=Language= |
=Language= |
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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. |
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. |
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This one tells the operating system to use the [[Bourne |
This one tells the operating system to use the [[Bourne Shell]]: |
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#!/bin/sh |
#!/bin/sh |
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This line tells the operating system to use the [[Bourne Again SHell]]: |
This line tells the operating system to use the [[Bourne Again SHell]]: |
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#!/bin/bash |
#!/bin/bash |
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And this one tells the operating system to use the [[Korn |
And this one tells the operating system to use the [[Korn Shell]]: |
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#!/bin/ksh |
#!/bin/ksh |
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