crontab

最新推荐文章于 2024-12-27 09:48:02 发布

kevin_darkelf

最新推荐文章于 2024-12-27 09:48:02 发布

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分类专栏： linux 文章标签： crontab

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网上crontab的说明文章好多都是瞎抄，有没有什么问题都不过脑子，还是要自己写才说得明白

Linux crontab

直接查看机器上的帮助

/etc/crontab

$cat /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root

# For details see man 4 crontabs

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name  command to be executed

00 00 * * * root /opt/taobao/install/tengine-1.4.11/bin/tmd-rlog.sh

man crontab

例子

30 21 * * * /usr/local/etc/rc.d/lighttpd restart         # 每晚的21:30重启apache。
45 4 1,10,22 * * /usr/local/etc/rc.d/lighttpd restart    # 每月1、10、22日的4 : 45重启apache。
10 1 * * 6,0 /usr/local/etc/rc.d/lighttpd restart        # 每周六、周日的1 : 10重启apache。
0,30 18-23 * * * /usr/local/etc/rc.d/lighttpd restart    # 每天18 : 00至23 : 00之间每隔30分钟重启apache。
0 23 * * 6 /usr/local/etc/rc.d/lighttpd restart          # 每星期六的11 : 00 pm重启apache。
* */1 * * * /usr/local/etc/rc.d/lighttpd restart         # 每一小时重启apache
* 23-7/1 * * * /usr/local/etc/rc.d/lighttpd restart      # 晚上11点到早上7点之间，每隔一小时重启apache
0 11 4 * mon-wed /usr/local/etc/rc.d/lighttpd restart    # 每月的4号与每周一到周三的11点重启apache
0 4 1 jan * /usr/local/etc/rc.d/lighttpd restart         # 一月一号的4点重启apache

其它

还有一些crontab 表达式，但一定要注意字段个数和函义的不同

如：http://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/crontrigger.html

这货的时间字段有 6个，

A cron expression is a string comprised of 6 or 7 fields separated by white space. Fields can contain any of the allowed values, along with various combinations of the allowed special characters for that field. The fields are as follows:

Field Name Mandatory Allowed Values Allowed Special Characters
Seconds YES 0-59 , - * /
Minutes YES 0-59 , - * /
Hours YES 0-23 , - * /
Day of month YES 1-31 , - * ? / L W
Month YES 1-12 or JAN-DEC , - * /
Day of week YES 1-7 or SUN-SAT , - * ? / L #
Year NO empty, 1970-2099 , - * /

Field Name	Mandatory	Allowed Values	Allowed Special Characters
Seconds	YES	0-59	, - * /
Minutes	YES	0-59	, - * /
Hours	YES	0-23	, - * /
Day of month	YES	1-31	, - * ? / L W
Month	YES	1-12 or JAN-DEC	, - * /
Day of week	YES	1-7 or SUN-SAT	, - * ? / L #
Year	NO	empty, 1970-2099	, - * /