in reply to Getopt::Long and default number

Try this: 
my $opt = "0";
$result = GetOptions ("opt:s" => \$opt,);
$opt = 100 if ($opt eq "");

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I'm pretty sure there are some better way to perform this task, but can't figure out how right now.

surrender to perl. your code, your rules.

In Section Seekers of Perl Wisdom