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}
Linux定时任务:crontab - 爱码网
crontab命令用于设置周期性被执行的指令。该命令从标准输入设备读取指令,并将其存放于crontab文件中,以供之后读取和执行。通常,crontab储存的指令被守护进程**。crond 常常在后台运行,每一分钟检查是否有预定的作业需要执行。这类作业一般称为cron jobs。
安装
首先,需要先安装vixie-cron。vixie-cron软件包是cron的主程序
直接使用yum安装:
yum install vixie-cron
而后,安装crontabs。cront)abs软件包是用来安装、卸装、或列举用来驱动 cron 守护进程的表格的程序。cron 是linux的内置服务,但它不自动启动。
同样直接使用yum安装:
yum install crontabs
使用
使用 crontab -e 命令直接进入crontab定时器编辑页面:
crontab的用法可参见下图:(from https://blog.csdn.net/wd2011063437/article/details/78960668)

表示为命令即:
* * * * * command
字符的含义为:
星号(*):代表所有可能的值,例如day字段如果是星号,则表示在满足其它字段的制约条件后每天都执行该命令操作。
逗号(,):可以用逗号隔开的值指定一个列表范围,例如,“1,2,5,7,8,9”
中杠(-):可以用整数之间的中杠表示一个整数范围,例如“2-6”表示“2,3,4,5,6”
正斜线(/):可以用正斜线指定时间的间隔频率,例如“0-23/2”表示每两小时执行一次。同时正斜线可以和星号一起使用,例如*/10,如果用在minute字段,表示每十分钟执行一次。
需要注意的是:在crontab中%是有特殊含义的,表示换行的意思。如果要用的话必须进行转义\%,如经常用的`date +%T`在crontab里是不会执行的,应该换成`date +\%T`。
例子
如:每隔30分钟执行一次指定shell的脚本
*/30 * * * * sh test.sh > /dev/null
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