Linux › Section G · System configuration › Topic G.6

One-time tasks with at and user timer units

Not every job repeats. Sometimes you want a file removed at midnight, a reminder in two hours or a script run when the machine is quiet. The at command, transient systemd timers and per-user timer units cover these cases without editing a crontab.

In this topic

  • Run it once, later
  • The at command
  • Time specifications
  • Worked example: resolving at times
  • Managing the queue
  • batch: wait for a quiet machine
  • Transient timers with systemd-run
  • Worked example: at versus systemd-run
  • User timer units
  • Common mistakes to avoid
  • Key takeaways

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