我有几个简单的cron作业在root下运行.然而,他们似乎跑了两次,我无法弄清楚为什么.没有其他用户运行任何cron作业,唯一的cronfile是root用户.工作完成得很好,但两次.
@H_301_2@这是根crontab文件:
# /etc/crontab: system-wide crontab # Unlike any other crontab you don't have to run the `crontab' # command to install the new version when you edit this file # and files in /etc/cron.d. These files also have username fields,# that none of the other crontabs do. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * cd / && run-parts --report /etc/cron.hourly 25 6 * * * test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) 47 6 * * 7 test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) 52 6 1 * * test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly ) 0,30 * * * * sh /scripts/amsbackup.sh 0,15,30,45 * * * * sh /scripts/dbbackup.sh #@H_301_2@我确实检查了cron是否通过exicuting运行了两次,ps aux | grep cron这里是输出,表明有两个进程:
root 9822 0.0 0.0 2620 892 ? Ss Dec24 0:01 cron root 19146 0.0 0.0 3904 788 pts/1 S+ 21:27 0:00 grep --color=auto cron@H_301_2@那么发生了什么,我该如何预防呢? @H_301_2@感谢您的任何帮助.