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03 Nov 2026 · linux, systemd, cron, automacao · 4 min
A systemd timer is a pair of files: a .timer that says when to fire and a .service that says what to run. OnCalendar takes calendar expressions like cron, Persistent=true recovers a missed run when the machine was off, and the log goes to the journal. Migration is replacing the crontab line with these two files.
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