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  1. or download this
    getopts('oif:', \%opts);  # options as above. Values in %opts
  2. or download this
    no strict 'refs';
warn local ${"opt_?"} = 6;
  3. or download this
    use Getopt::Long;
GetOptions( q!help|h|?! => \$help );
  4. or download this
    $ perl -MGetopt::Long -e " my $help; GetOptions( q!help|h|?! => \$help
+ ); warn $help; " -- --help
1 at -e line 1.
...
$ perl -MGetopt::Long -e " my $help; GetOptions( q!help|h|?! => \$help
+ ); warn $help; " -- -f
Unknown option: f
Warning: something's wrong at -e line 1.