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cron服务每分钟不仅要读一次/var/spool/cron内的所有文件,还需要读一次/etc/crontab,因此我们配置这个文件也能运用 cron服务做一

Ubuntu中

编辑文件 /etc/crontab

sudo vi  /etc/crontab

cron服务每分钟不仅要读一次/var/spool/cron内的所有文件,还需要读一次/etc/crontab,因此我们配置这个文件也能运用 cron服务做一些事情。用crontab配置是针对某个用户的,而编辑/etc/crontab是针对系统的任务。此文件的文件格式是:

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin=
MAILTO=root      //如果出现错误,或者有数据输出,数据作为邮件发给这个帐号
HOME=/    //使用者运行的路径,这里是根目录
# run-parts
01 * * * * root run-parts /etc/cron.hourly      //  每小时 以root用户身份 执行/etc/cron.hourly内的脚本
02 4 * * * root run-parts /etc/cron.daily        //  每天 以root用户身份 执行/etc/cron.daily内的脚本
22 4 * * 0 root run-parts /etc/cron.weekly   //   每星期  以root用户身份 执行/etc/cron.weekly内的脚本
42 4 1 * * root run-parts /etc/cron.monthly //   每月   以root用户身份 去执行/etc/cron.monthly内的脚本

注意"run-parts"这个参数,如果去掉这个参数的话,后面就可以写要运行的某个脚本名,而不是文件夹名了。

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