How do I use the at command to run a command at a specified time?

hawksbill

Also see:
Man page for at
warning: commands will be executed using /bin/sh

Here are some examples.

Run immediately. Good for testing.

$ echo /home/trainer/scripts/hw | at now

Run at a specified time.

$ echo /home/trainer/scripts/hw | at 12:00

Run after 2 hours.

$ echo /home/trainer/scripts/hw | at now + 2 hours

Run after 20 minutes

$ echo /home/trainer/scripts/hw | at 12:00 + 20 minutes

Run at 06:00 next day.

$ echo /home/trainer/scripts/hw | at 06:00 tomorrow

Run on a certain date.

$ echo /home/trainer/scripts/hw | at 04 July