Systemd Timer 定时任务

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sudo vim /usr/lib/systemd/system/task.timer

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[Unit]
Description=Task Description

[Timer]
OnCalendar=*-*-* 06:00:00
AccuracySec=1s
Unit=lock.service

[Install]
WantedBy=multi-user.target

be carefully with AccuracySec, without it your task will be delayed for tens of seconds

Specify the accuracy the timer shall elapse with. Defaults to 1min. The timer is scheduled to elapse within a time window starting with the time specified in OnCalendar=, OnActiveSec=, OnBootSec=, OnStartupSec=, OnUnitActiveSec= or OnUnitInactiveSec= and ending the time configured with AccuracySec= later. Within this time window, the expiry time will be placed at a host-specific, randomized, but stable position that is synchronized between all local timer units. This is done in order to optimize power consumption to suppress unnecessary CPU wake-ups. To get best accuracy, set this option to 1us. Note that the timer is still subject to the timer slack configured via systemd-system.conf(5)’s TimerSlackNSec= setting. See prctl(2) for details. To optimize power consumption, make sure to set this value as high as possible and as low as necessary.

OnCalendar examples