利用cron监视后台进程状态(二)

第二种方案：更改系统级的crontab

1. 命令行输入：$sudo vim /etc/crontab

最后一行添加：*  *    * * *   root    bash /home/test/wanda_img_store/backends/bin/cron_worker.sh  ，记得一定要添加user：root，否则不生效！

1 # /etc/crontab: system-wide crontab
2 # Unlike any other crontab you don't have to run the `crontab'
3 # command to install the new version when you edit this file
4 # and files in /etc/cron.d. These files also have username fields,
5 # that none of the other crontabs do.
6
7 SHELL=/bin/sh
8 PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
9
10 #m h dom mon dow user   command
11 17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
12 25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
13 47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
14 52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
15 *  *    * * *   root    bash /home/test/wanda_img_store/backends/bin/cron_worker.sh
16 #
~
~
~
~
~
~
~

2. 需要crontab需要重载刚才的文件；命令行输入：$sudo service cron reload/restart 

3. 查看更改的是否生效，$sudo crontab -l