# Countdown Timer
sub sleep_count {
    my $minutes = shift;
    my $string = shift;
    my $command = shift;
    my $command_time_interval = shift;
    my $countdown = $minutes*60; # in secs.

    $| = 1;

    my $beg_time = time;
    my $end_time = $beg_time + $countdown;

    for (;;) {
        my $time = time;
        last if ($time >= $end_time);
        printf("\r[ %02d:%02d ] $string",
        ($end_time - $time) / (   60) % 60,
        ($end_time - $time)           % 60,
        );
        sleep(1);
    }
}