Linux CLI - Cron and Scheduling
You want a systemd timer to run a backup script every Sunday at 2 AM, but only if the system was off at that time. Which timer settings achieve this?
You want a systemd timer to run a backup script every Sunday at 2 AM, but only if the system was off at that time. Which timer settings achieve this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Persistent=true effect
Persistent=true makes systemd run missed timer jobs after boot if the system was off at scheduled time.Step 2: Analyze other options
AccuracySec controls timer precision, WakeSystem wakes system from suspend, RemainAfterElapse keeps timer active but does not run missed jobs.Final Answer:
OnCalendar=Sun 02:00:00 with Persistent=true -> Option DQuick Check:
Persistent=true runs missed jobs after downtime [OK]
Quick Trick: Use Persistent=true to run missed timers after downtime [OK]
Common Mistakes:
- Confusing WakeSystem with Persistent
- Using AccuracySec to fix missed runs
- Misunderstanding RemainAfterElapse purpose
Master "Cron and Scheduling" in Linux CLI
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