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     leave - remind you when you have to leave


     leave [[+]hhmm]


     leave waits until the specified time (within the next 12 hours), then
     reminds you that you have to leave by writing to the TTY that you
     executed leave on.

     You are reminded 5 minutes and 1 minute before the actual time, at the
     time, and every minute thereafter.  When you log off, leave exits just
     before it would have printed the next message.


     hhmm  The time of day is in the form hhmm where hh is a time in hours (on
           a 12 or 24 hour clock), and mm are minutes.

           However, all times are converted to a 12 hour clock, and assumed to
           be in the next 12 hours.  An attempt to set an alarm for farther
           into the future will be truncated to within the next 12 hours.

     +     If the time is preceded by ‘+’, the alarm will go off in hours and
           minutes from the current time.

     If no argument is given, leave prompts with "When do you have to leave?"
     A reply of newline causes leave to exit, otherwise the reply is assumed
     to be a time.  This form is suitable for inclusion in a ~/.login or


     calendar(1), csh(1), sh(1)


     The leave command appeared in 3.0BSD.


     In the modern age with X(1) and window multiplexing programs like
     window(1) and screen(1), the leave command’s reminders and admonitions
     might not be seen if the user has the window where leave was started
     minimized or obscured.

     This all begs for a more general user notifications system to be