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  1. or download this
    use strict;
use warnings;
...
    or die("usage\n");

print( $opt_verbose || 0, "\n");
  2. or download this
    >perl 806754.pl -v
1

>perl 806754.pl --verbose
1
  3. or download this
    >perl 806754.pl -verbose
Unknown option: e
...
>perl 806754.pl --Verbose
Unknown option: Verbose
usage