It’s called a shebang, and tells the parent shell which interpreter should be used to execute the script.
#!/bin/sh <--------- bourne shell compatible script #!/usr/bin/perl <-- perl script #!/usr/bin/php <--- php script #!/bin/false <------ do-nothing script, because false returns immediately anyways.
Most scripting languages tend to interpret a line starting with # as comment and will ignore the following !/usr/bin/whatever portion, which might otherwise cause a syntax error in the interpreted language.
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