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  1. or download this
    $ ./program.pl

# or if it's in known PATH:
$ program.pl
  2. or download this
    $ cat foo.pl
#!/usr/bin/perl
...
foo = bar, v = 1
$ ./foo.pl --for=bar -v
foo = bar, v = 1
  3. or download this
    $ cat foo.pl
#!/usr/bin/perl
...
foo = bar, v = 1
$ ./foo.pl --for=bar -v
foo = bar, v = 1