《crontab命令详解 含启动/重启/停止》

安装服务：yum install crontabs

配置文件：

# cat /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
For details see man 4 crontabs
Example of job definition:
.---------------- minute (0 - 59)
|  .------------- hour (0 - 23)
|  |  .---------- day of month (1 - 31)
|  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
|  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
|  |  |  |  |
*  *  *  *  * user-name  command to be executed
每小时重启nginx
0 * * * * root /etc/nginx/restart.sh

命令：

状态：systemctl status crond

重启：systemctl restart crond

加载配置文件：systemctl reload crond