leave - warn when it is time to go home
leave [ [+] hh[:]mm]
leave 1500 # Issue a warning at 2:55 p.m.
leave 10:00 # Issue a warning at 9:55 a.m.
leave + 30 # Issue a warning in 25 minutes
Leave sets an alarm clock to a specified time and issues a warning 5
minutes before, 1 minute before, and at the time to leave. It then keeps
issuing warnings every minute for 10 minutes, then quits. If no time is
provided, the program prompts for one.