3 gdc \- grand digital clock (curses)
11 runs a digital clock made of reverse-video blanks on a curses
12 compatible VDU screen. With an optional numeric argument
16 seconds (default never).
19 flag makes digits scroll as they change. In this curses mode implementation,
20 the scrolling option has trouble keeping up.
22 Amos Shapir, modified for curses by John Lupien.