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$ cat > fred.pl
#!/usr/bin/not_perl
print "Hello, world!\n";

$ ls -l /usr/bin/not_perl
ls: /usr/bin/not_perl: No such file or directory

$ chmod +x fred.pl

$ fred.pl
-bash: ./fred.pl: /usr/bin/not_perl: bad interpreter: No such file or 
+directory

$ perl fred.pl
Hello, world!