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I've built a program and I want to run it every 5 mins at round time (**:00, **:05, **:10, ..., not **:01, **:06, **:11, ... or **:03, **:08, **:13, ...).

As I've read, it's better to use systemd than crontab, so I want to use systemd. And I understand how to launch program every 5 mins, but it doesn't launch at round time. I know I can try to launch the program at **:00 so next time it will launch at **:05 and etc, but it seems to be a too silly way.

How do I launch program like this with systemd? Or I can't do it with systemd and I should use crontab?

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I don’t think there’s a nice shortcut, but you can do this by listing the possible times in OnCalendar=:

OnCalendar=*-*-* *:0,5,10,15,20,25,30,35,40,45,50,55:00

in normalised form.

systemd usually allows itself a minute of leeway on calendar events; you can tighten this by specifying AccuracySec=.

  • Yep, it works nice! Thank you! – Aphro Disiac Sep 8 '20 at 23:17

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