at

Executes commands at a specified time. More information: https://manned.org/at.1.

• Open an at prompt to create a new set of scheduled commands, press Ctrl + D to save and exit:

at hh:mm

• Execute the commands and email the result using a local mailing program such as Sendmail:

at hh:mm -m

• Execute a script at the given time:

at hh:mm -f path/to/file

• Display a system notification at 11pm on February 18th:

echo "notify-send 'Wake up!'" | at 11pm Feb 18