$ /usr/bin/perl -e 'print "Hello, world!\n"'
Hello, world!

$ /usr/not_bin/perl -e 'print "Hello, world!\n"'
-bash: /usr/not_bin/perl: No such file or directory

##</code><code>##

$ cat crap.pl
#!/usr/not_bin/perl

use strict;
use warnings;

print "Hello, World...\n";

$ ./crap.pl
-bash: ./crap.pl: /usr/not_bin/perl: bad interpreter: No such file or directory