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25 lines
1.1 KiB
Plaintext
25 lines
1.1 KiB
Plaintext
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====== Interpreter Directive ======
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* shebang
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The interpreter directive, usually called shebang, is the character sequence starting with ''#!'' (hash, exclamation-point) at the beginning of the very first line of an executable text file on unixoid operating systems.
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The program loader of the operating system may use this line to load an interpreter for this file when executed. This makes it a self-executable script.
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A shebang will typically look like
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<code>
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#!/bin/bash
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</code>
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Since the line starting with ''#'' is a comment for the shell (and some other scripting languages), it's ignored.
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Regarding the shebang, there are various, differences between operating systems, including:
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* may require a space after ''#!'' and before the pathname of the 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 supported by operating systems.
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===== See also =====
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* [[http://www.in-ulm.de/~mascheck/various/shebang/ | #!-magic]] - a nice overview of the differences between various operating systems
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