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  1. or download this
    #!/usr/bin/perl

...

sub update_test { print "!test\n" }
sub update_hello { print "hello!\n" }
  2. or download this
    $ perl x.pl test
!test
...
hello!
$ perl x.pl heheh
Can't locate object method "update_heheh" via package "main" at x.pl l
+ine 10.
  3. or download this
    #!/usr/bin/perl

...

sub update_test { print "!test\n" }
sub update_hello { print "hello!\n" }