Thanks.Also I just want to use 'msm' as an option,no value should be entered for it,how do I make sure that option msm is given but there should be no value.Will the following work?how to make the options case-insensitive?Thanks Update:Ignore the query but i would like to know how to I stop on an unknown option given?

    

use Getopt::Long; 
 
#Getting the command-line options 
my %options = (); 
GetOptions (\%options,'msm','des=s', 'a=s', 'd=s', 'r=i', 'v=s'); 
if($options(msm)){....}
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