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Every crontab command require as mandatory the minute, hour and day fields. Now supposing I just want that a certain script or command should be executed once every 3 months on my desktop. AFAIK crontab command and file was born to run on servers which ones are up and running 24/24h while I'm not sure that my desktop in 3 months by now will be up and running in a certain minute/hour/day.

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    Are you looking for anacron? It's basically the same as cron but also runs tasks which it 'missed'. – Panki Mar 28 at 8:49
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You can create a systemd timer with option Persistent=true:

https://wiki.archlinux.org/index.php/Systemd/Timers#Realtime_timer

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