#!/usr/local/bin/perl -w
    use 'Getopt::Std'

    getopt('abcd:ef:');
    print "Switch a is on\n" if $opt_a;
    print "Switch b is on \n" if $opt_b;
    print "Switch c is on \n" if $opt_c;
    print "Debug switch set to $opt_d\n" if $opt_d > 5;
    print "Switch e is on\n" if $opt_e;
    if ($opt_f) {
      print "Cannot locate file $opt_f\n" unless -e $opt_f;
    }

    for $I (1..5) {
      print "Value of I is $I\n" if $opt_d;
    }

    print "No (more) switches specified\n";