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crontab

Ted posted @ 2008年8月21日 21:01 in 未分类 with tags crontab , 2787 阅读

crontab 指定在固定时间或固定间隔执行特定的脚本;crontab的常用参数有如下3个:

-e :执行文字编辑器来设定日程表,一般默认的编辑器是VI;

-r :删除目前所有的日程表;

-l :列出目前所有的日程表;

设置日程表时,需要有固定的格式,共6部分,各部分间用空格间隔;其中第6个部分是要执行的命令,前5个部分是设置执行时间或者时间间隔的,具体取值范围和意义如下:

分钟【0-59】 小时【0-23】 日【1-31】 月份【1-12】 星期【0-6】

在设置的时候可以每项有4种指定方式,如下:

* :表示每 分钟/.../星期 都需要执行;

a-b :表示从第 a 分钟/.../星期 到第 b 分钟/.../星期 这段期间都需要执行;

*/n :表示每 n个 分钟/.../星期 时间间隔执行一次;

a,b,c :表示第 a,b,c 分钟/.../星期 时需要执行,也即指定多个具体时间点;

举个例子来说,比如要指定每日早上7点执行脚本mysh的crontab设置如下:

0 7 * * * /home/admin/mysh >/home/admin/mylog.txt 2>&1

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