Hi

I think you want the ":" signifier when identifying your options. This says the value for the option is optional. If the option is present without a value, it takes the number indicatied after the ":" ; otherwise it takes the user-supplied value. This is in the POD in the section "Summary of Option Specifications"

use Getopt::Long;

my $opt = 0;

GetOptions ("opt:100" => \$opt );

print "Opt is:\t$opt\n";
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My test runs give:

>opt.pl --opt
Opt is: 100

>opt.pl --opt 7
Opt is: 7

>opt.pl
Opt is: 0
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HTH

- j