$ cat > pm_1195740_bad_shebang.pl
#!/user/bin/perl
print "Hello, world!\n";
$ chmod +x pm_1195740_bad_shebang.pl
$ pm_1195740_bad_shebang.pl
-bash: ./pm_1195740_bad_shebang.pl: /user/bin/perl: bad interpreter: No such file or directory
$ cat > pm_1195740_good_shebang.pl
#!/usr/bin/perl
print "Hello, world!\n";
$ chmod +x pm_1195740_good_shebang.pl
$ pm_1195740_good_shebang.pl
Hello, world!
$ 

##</code><code>##

$ chmod -x pm_1195740_good_shebang.pl
$ pm_1195740_good_shebang.pl
-bash: ./pm_1195740_good_shebang.pl: Permission denied
$ ../pm_1195740_good_shebang.pl
-bash: ../pm_1195740_good_shebang.pl: No such file or directory
$ 

##</code><code>##

#!/usr/bin/env perl