~~~ crontab -help ~~~ 用例 ~~~ [root@iZ23w9ljtgdZ ~]# crontab -help crontab: invalid option -- 'h' crontab: usage error: unrecognized option usage: crontab [-u user] file crontab [-u user] [ -e | -l | -r ] (default operation is replace, per 1003.2) -e (edit user's crontab) -l (list user's crontab) -r (delete user's crontab) -i (prompt before deleting user's crontab) -s (selinux context) ~~~ 创建用户计划任务 ~~~ [root@iZ23w9ljtgdZ ~]# useradd cron_user [root@iZ23w9ljtgdZ ~]# crontab -u cron_user -e no crontab for cron_user - using an empty one crontab: installing new crontab [root@iZ23w9ljtgdZ ~]# crontab -u cron_user -l 1-59/2 * * * * echo "odd" ~~~ 查看计划执行 ~~~ [root@iZ23w9ljtgdZ ~]# tail -f /var/log/cron Jun 9 11:01:01 iZ23w9ljtgdZ run-parts(/etc/cron.hourly)[19563]: starting 0anacron Jun 9 11:01:01 iZ23w9ljtgdZ run-parts(/etc/cron.hourly)[19572]: finished 0anacron Jun 9 11:10:01 iZ23w9ljtgdZ CROND[19616]: (root) CMD (/usr/lib64/sa/sa1 1 1) Jun 9 11:13:20 iZ23w9ljtgdZ crontab[19651]: (root) LIST (root) Jun 9 11:17:32 iZ23w9ljtgdZ crontab[19676]: (root) BEGIN EDIT (cron_user) Jun 9 11:18:23 iZ23w9ljtgdZ crontab[19676]: (root) REPLACE (cron_user) Jun 9 11:18:23 iZ23w9ljtgdZ crontab[19676]: (root) END EDIT (cron_user) Jun 9 11:18:53 iZ23w9ljtgdZ crontab[19685]: (root) LIST (cron_user) Jun 9 11:19:01 iZ23w9ljtgdZ CROND[19690]: (cron_user) CMD (echo "odd") Jun 9 11:20:01 iZ23w9ljtgdZ CROND[19702]: (root) CMD (/usr/lib64/sa/sa1 1 1) Jun 9 11:21:01 iZ23w9ljtgdZ CROND[19709]: (cron_user) CMD (echo "odd") CTRL+C ~~~