Thank you Eliya. That makes perfect sense. I was overlooking the obvious (PERL newbie)

I have another quick question: Do you know the best way to make an option dependent on another? For example, in the code given above, I also add an option t that also requires a value, but the program will exit with an error if option t exists but not option c

use strict;
use Getopt::Long;

my $result = GetOptions (
          "c=s" => \&COMP1,
          "t=s" => \&COMP2, # COMP2 will not be called if option c is 
+null?
          '<>' => sub {print "\nThat is not a valid parameter\n";},
    );

sub COMP1 {print "\nOption -$_[0] is value=$_[1]\n";}
sub COMP2 {print "\nOption -$_[0] is value=$_[1]\n";}
[download]

One thought is to load a variable and process them later, like this:

use strict;
use Getopt::Long;

my $COMP1 = 0;
my $COMP2 = 0;
my $result = GetOptions (
          "c=s" => \$COMP1,
          "t=s" => \$COMP2,
          '<>' => sub {print "\nThat is not a valid parameter\n";},
    );

if (!$COMP1) {
   if ($COMP2) {
       print "\nOption t won't run without option C";
  }
}
[download]

But I imagine there is a better way using GetOptions(). Ideas? Thank you.

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