A simple command line countdown ending with an alarm: the screen reverses its colors.
-a switch to set an alarm at the end: assuming that
xcalib is installed on your computer, the
-a switch will invert the color of your screen. It's time for a break!
To restore the screen colors, press Enter.
You can pause the countdown by pressing Ctrl+C. Press Enter to resume, or Ctrl+C again to stop the countdown.