关于cron的问题,其实很普通,这里把工作中遇到的问题写下.
cron的名称来自Chronos(古希腊的时间之神),它允许cron以守护进程的方式运行.cron一般会随着Solaris启动而自启动.下面写下cron的工作流程,好好的整理下.首先是启动进程,开机自动启动的.怎么能不启动呢?
在solaris下,查看cron是否启动
![](data:image/png;base64,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)
这里的default是在/etc/default下面的在有的版本是在/etc/rc2.d中的 从目录中拿出来其实就不开机启动了.
手动启动和关闭采用svcadm管理,当然默认是root才有的权限.
然后会到
![](data:image/png;base64,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)
中去寻找定义的cron文件.然后选择其中允许运行的执行,这里得说下cron.allow和cron.deny位置是/etc/cron.d 里面有cron.allow 和cron.deny 来允许哪些用户有权限运行cron,因为cron有时候是很费资源的,尤其是每小时或者数分钟就执行的io任务.优先级是先看allow如果没有allow文件,则会去寻找deny
crontab文件格式
0 0 * * 3 /usr/bin/updatedb
分
小时
日
月
星期几 自动执行的程序
(0-23)
(1-7)
|
Crontab文件的每一行由六个域组成
域之间用空格或Tab分开
每天(日,月,星期几
都是*)
10 3 * * * /usr/sbin/logadm
|
每小时
10 * * * * /usr/sbin/logadm
|
其中每一个域如果要用多个值,用逗号隔开,如果是值连续的值,可以用英文的-连接 比如 1-50
cron的运行log在 /var/cron/log中,每一次运行都会有一个returen code 即,rc值,rc值为0则成功.为1或者2就是失败的。
crontab命令以参数。可以直接对文件进行编辑,但是危险系数比较高。最好的方法就是使用命令。
crontab -e 对cron进行编辑。
crontab -l 列出cron
crontab -r 移除cron
crontab + 文件名 用文件中的内容覆盖现有的crontab。
有时,crontab -e无法打开用户的crontab,如果确定用户有运行的cron权利,那么一般是编辑器变量 EDITOR没有恰当的值,如果在bash里,可以这样指定 export EDITOR=vi ,也可以是你用的别的编辑器。
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