my %commands = (
    "set time" => sub {
        print "nMetrics>You have entered the settime command\n";
        print "nMetrics>The argument given is $_[0]\n";
    },
    "show time" => sub {
        print "nMetrics>You have entered the show time command\n";
    },
    default => sub {
        print "nMetrics>Invalid command line options\n";
    }
);