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    <p>That is called a <a href="http://en.wikipedia.org/wiki/Shebang_%28Unix%29">shebang</a>, it tells the shell what program to interpret the script with, when executed.</p> <p>In your example, the script is to be interpreted and run by the <a href="http://en.wikipedia.org/wiki/Bash_%28Unix_shell%29">bash</a> shell.</p> <p>Some other example shebangs are:</p> <p>(From Wikipedia)</p> <pre><code>#!/bin/sh — Execute the file using sh, the Bourne shell, or a compatible shell #!/bin/csh — Execute the file using csh, the C shell, or a compatible shell #!/usr/bin/perl -T — Execute using Perl with the option for taint checks #!/usr/bin/php — Execute the file using the PHP command line interpreter #!/usr/bin/python -O — Execute using Python with optimizations to code #!/usr/bin/ruby — Execute using Ruby </code></pre> <p>and a few additional ones I can think off the top of my head, such as:</p> <pre><code>#!/bin/ksh #!/bin/awk #!/bin/expect </code></pre> <p>In a script with the bash shebang, for example, you would write your code with bash syntax; whereas in a script with expect shebang, you would code it in expect syntax, and so on.</p> <p><strong>Response to updated portion:</strong></p> <p>It depends on what <code>/bin/sh</code> actually points to on your system. Often it is just a symlink to <code>/bin/bash</code>. Sometimes portable scripts are written with <code>#!/bin/sh</code> just to signify that it's a shell script, but it uses whichever shell is referred to by <code>/bin/sh</code> on that particular system (maybe it points to <code>/bin/bash</code>, <code>/bin/ksh</code> or <code>/bin/zsh</code>)</p>
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    1. POBash Script : what does #!/bin/bash mean?
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    1. POBash Script : what does #!/bin/bash mean?
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    1. COThanks! But is there a difference between `#!/bin/bash` and `#!/bin/sh` ?
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      1. USRaptor
    2. CO@ShivanRaptor `#!/bin/bash` Means run this script in bash. `#!/bin/sh` means run this script in `sh` which is the default unix shell, which might be bash or any other variant like ksh, dash, zsh, etc
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      1. USKarthik T
    3. COWhen `bash` is run as `sh`, it behaves differently (more POSIX-like) than when it is run as `bash`. Read the manual; it does cover that detail.
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      1. USJonathan Leffler
 

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