Linux under Crond scheduling

Edit/var/spool/cron/root File

Basic format:
* * * * * command
Time-sharing Weekly command

1、每分钟执行一次 * * * * *  2、每隔一小时执行一次 0 * * * * or* */1 * * * (/表示频率) 3、每小时的15和30分各执行一次 15,45 * * * * （,表示并列） 4   8  - 11   15    45   15,45 8-11 * * * command （-表示范围） 5   8   point to  11   dot  3   and section  15   minutes execution  3,15 8-11 * * 1 command 6   8   point to  11   dot  3   and section  15   minutes execution  3,15 8-11 */2 * * command

You can open the/var/log/cron file to see if the task is functioning properly.

Reference: Perform a scheduled task under Linux crontab command detailed

Linux under Crond scheduling