sched built-in command for tcsh: Print scheduled event list

sched used alone prints the scheduled-event list. The sched shell variable can be set to define the format in which the scheduled-event list is printed. sched hh:mm command adds command to the scheduled-event list. For example:

 >sched 11:00 echo It\'s eleven o\'clock.

causes the shell to echo 'It's eleven o'clock.' at 11 a.m. The time can be in 12-hour a.m. or p.m. format

>sched 5pm set prompt='[%h] It\'s after 5; go home: >'

or it can be relative to the current time:

>sched +2:15 /usr/lib/uucp/uucico -r1 -sother

A relative time specification cannot use a.m. or p.m. format together. The third form removes item n from the event list:

        > sched
        1 Wed Apr 4 15:42 /usr/lib/uucp/uucico -r1 -sother
        2 Wed Apr 4 17:00 set prompt=[%h] It's after 5; go home: >
        > sched -2
        > sched
        1 Wed Apr 4 15:42 /usr/lib/uucp/uucico -r1 -sother

A command in the scheduled-event list is executed just before the first prompt is printed after the time when the command is scheduled. It is possible to miss the exact time when the command is to be run, but an overdue command will execute at the next prompt. A command which comes due while the shell is waiting for user input is executed immediately. However, normal operation of an already-running command will not be interrupted so that a scheduled-event list element can be run.