Linux scheduled task crontab and Linux task crontab

Linux scheduled task crontab and Linux task crontab

Crontab scheduled task format

1 * command2 column 1st indicates minute 1 ~ 59 every minute, use * or */1 to indicate 3, 2nd columns to indicate hour 1 ~ 23 (0 indicates 0 points) 4 3rd columns indicate date 1 ~ Column 315 indicates the month 1 ~ 126 5th Column ID No. 0 ~ 6 (0 indicates Sunday) 7 6th columns of commands to be run

 

The time granularity of crontab is minute. to implement a second-level task, you only need to use the sleep command. For example, once every 30 seconds:

1 * command2 * sleep 10; command3 * sleep 20; command4 * sleep 30; command5 ***** sleep 40; command6 ***** sleep 50; command7