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36 lines
1.0 KiB
Markdown
36 lines
1.0 KiB
Markdown
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# Interpreter Directive
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- shebang
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The interpreter directive, usually called shebang, is the character
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sequence starting with `#!` (hash, exclamation-point) at the beginning
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of the very first line of an executable text file on unixoid operating
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systems.
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The program loader of the operating system may use this line to load an
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interpreter for this file when executed. This makes it a self-executable
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script.
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A shebang will typically look like
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#!/bin/bash
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Since the line starting with `#` is a comment for the shell (and some
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other scripting languages), it\'s ignored.
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Regarding the shebang, there are various, differences between operating
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systems, including:
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- may require a space after `#!` and before the pathname of the
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interpreter
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- may be able to take arguments for the interpreter
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- \...
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POSIX(r) doesn\'t specify the shebang, though in general it\'s commonly
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supported by operating systems.
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## See also
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- [#!-magic](http://www.in-ulm.de/~mascheck/various/shebang/) - a nice
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overview of the differences between various operating systems
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