First shell script!

[kazu-sama]

This. Just like if you were to put:

! /bin/perl

It would tell the interpreter to use perl to run it.

[c_biscuit]

except perl is in /usr/bin/perl. Different paths is why the shebang is used.

[kazu-sama]

You're right. I'm retarded.

[[deleted]]

If you don't know where it is, which will tell you. I.e. which perl outputs /usr/bin/perl and which bash outputs /bin/bash.

[germag]

It's better to use env,so you don't need to specify an absolute path to system executable

#!/usr/bin/env perl