at — Execute commands once at a later time. Results will be sent to the users mail.
# source: tldr · verified

Examples:
  # Start the `atd` daemon [GNU]
    $ systemctl start atd
  # Create commands interactively and execute them in 5 minutes (press `<Ctrl d>` when done) [GNU]
    $ at now + 5 minutes
  # Create commands interactively and execute them at a specific time [GNU]
    $ at hh:mm

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