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A script you can run twice

Write a scheduled script whose second run breaks nothing: describe the state you want rather than the change, check before acting, and exit non-zero only when something has actually failed.

22 minutesTechnical content last reviewed on 3 Aug 2026

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What this lesson builds

  • Writing a scheduled script you can rely on
  • Running a service under systemd, from first start to automatic recovery

End of the course

Backups and restores

Back up a database and files, apply retention, and above all verify that a restore works before you need it.

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