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  1. or download this
    use Getopt::Long;
use strict;
...
    "read"  => \$read,
    "generate" => \$generate,
);
  2. or download this
    if ($read) {
 - code snippets -
}
  3. or download this
    my ($read,$generate,$help); # option switches
GetOptions (
...
    "g" => \$generate,
    "generate" => \$generate,
);