4.4. at: schedule a command, but only once

You may also want to launch a command at a given day, but not regularly. For example, you want to be reminded of an appointment, today at 6pm. You run X, and you'd like to be notified at 5:30pm, for example, that you must go. at is what you want here:
$ at 5:30pm
  # You're now in front of the "at" prompt
at> xmessage "Time to go now! Appointment at 6pm"
  # Type C-d to exit
at> <EOT>
$
You can specify the time in different manners:

at also accepts different options:

As usual, see the at(1) manpage for more options.


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