Learning Go
Countdown timer that counts down from hh mm ss.
Usage:
To countdown 2 hours 12 mins 30 secs,
321go 2 12 30
To countdown 15 mins,
321go 15 00
To countdown 15 secs,
321go 15
Ctrl-C
to stop at any time.
The "Time's Up" notice will keep flashing in an infinite for-loop until the program is terminated.