如何每三小时运行 systemd 计时器
每三小时运行 systemd 计时器的语法是：
systemd_oncalendar_every_3_hours.conf
OnCalendar=*-*-* 00,03,06,09,12,15,18,21:00:00即在每个第二小时的第一个分钟和第一个秒（00:00）运行它（00,03,06,09,12,15,18,21）。
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