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[Unit]
Description=Cleanup Log Service

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Type=simple
ExecStart=/path/to/cleanuplog.sh

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WantedBy=default.target

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[Unit]
Description=Cleanup Log Timer

[Timer]
OnCalendar=*-*-* 01:00:00

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WantedBy=timers.target

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$ sudo mv cleanuplog.timer /etc/systemd/system

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$ sudo systemctl daemon-reload
$ sudo systemctl enable cleanuplog.timer
$ sudo systemctl start cleanuplog.timer

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