How to Increment or add minutes???;-)

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leave

leave(1)						      General Commands Manual							  leave(1)

NAME

       leave - remind you when you have to leave

SYNOPSIS

       [hhmm]

DESCRIPTION

       The  command waits until the specified time, then reminds you to leave.	You are reminded 5 minutes and 1 minute before the actual time, at
       the time, and every minute thereafter.  When you log off, exits.

       The time of day is in the form hhmm, where hh is a time in hours (which can range from 0 through 11 or 0 through 24 hours), and mm  is  the
       number  of minutes after the specified hour.  If the value of hh is greater than 11 (24-hour clock time), the specified value is reduced by
       12 to a new value in the range of 0 through 11, thus ensuring that the alarm time is always set to activate within the next 12 hours.   For
       example,  if  hhmm  is 1350 and the current time is 4:00 PM (1600), the 1350 value is changed to 150 and the alarm is set for 1:50 AM, nine
       hours and 50 minutes later.  On the other hand, if it is 9:00 AM and hhmm is specified as 2200 (10:00 PM), the value used is  converted	to
       1000 and the alarm is set for one hour later instead of 13 hours as specified.

       If no argument is provided, prompts with

       A reply of newline causes to exit; otherwise the reply is assumed to be a time.	This form is suitable for inclusion in a or file.

       The command ignores interrupts, quits, and terminate signals.  To get rid of it you should either log off or use giving its process ID.

EXAMPLES

       The command

       sends  an  alarm  (a  beep)  to your terminal to remind you that you have to leave at 12:04 and reminds you that you are late at one minute
       intervals after 12:04.

WARNINGS

       The command checks to see if a user has logged out by checking the file every 100 seconds.  If a user logs out and logs back in to the same
       tty before makes its periodic check, may not know that the user has logged out.

AUTHOR

       was developed by the University of California, Berkeley.

FILES

SEE ALSO

       calendar(1).

																	  leave(1)

Shell Programming and Scripting