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