Using the -s Option

The -s option lets you create your own custom switches. Custom switches are placed after the script name but before any filename arguments. Any custom switches are removed from the @ARGV array. Then a scalar variable is named after the switch is created and initialized to 1. For example, let's say that you want to use a switch called -useTR in a script like the one below:

if ($useTR) {

    # do TR processing.

    print "useTR=$useTR\n";

}

You might execute this program using this following command line:

perl -s -w 17lst03.pl -useTR

and it would display:

useTR=1