Well, in my example it is required. I must have misunderstood your question. If you want to require -l to be paired with a value, but not specifying -l is okay, too, try this:
use strict;
use warnings;
use Getopt::Long;
use vars qw($opt_u $opt_h $opt_a $opt_l);
#Note that l=s says that l requires an option
# l:s means that it is optional
# I have chosen the option method here so that
# I can handle it how I want programatically
&GetOptions('l:s','u','h','a') || exit 1;
print "Option found: u\n" if ($opt_u);
print "Option found: h\n" if ($opt_h);
print "Option found: a\n" if ($opt_a);
if (defined $opt_l) {
print "Option found: l\n";
if ($opt_l) {
print " with value: $opt_l\n";
} else {
print " No value specified.\n";
}
}
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