crontab 的格式备忘

March 31, 2007 29 Comments

经常用，但是经常忘记，基本的格式能记得，但是详细的或者复杂点的格式总会忘记或者拿不准，不知道是不是年纪大了记忆力下降，干脆整理出来今后方便查看。

基本格式 :
*　　*　　*　　*　　*　　command
分　时　日　月　周　命令

第1列表示分钟1～59 每分钟用*或者 */1表示
第2列表示小时1～23（0表示0点）
第3列表示日期1～31
第4列表示月份1～12
第5列标识号星期0～6（0表示星期天）
第6列要运行的命令

crontab文件的一些例子：

30 21 * * * /usr/local/etc/rc.d/lighttpd restart
上面的例子表示每晚的21:30重启lighttpd 。

45 4 1,10,22 * * /usr/local/etc/rc.d/lighttpd restart
上面的例子表示每月1、10、22日的4 : 45重启lighttpd 。

10 1 * * 6,0 /usr/local/etc/rc.d/lighttpd restart
上面的例子表示每周六、周日的1 : 10重启lighttpd 。

0,30 18-23 * * * /usr/local/etc/rc.d/lighttpd restart
上面的例子表示在每天18 : 00至23 : 00之间每隔30分钟重启lighttpd 。

0 23 * * 6 /usr/local/etc/rc.d/lighttpd restart
上面的例子表示每星期六的11 : 00 pm重启lighttpd 。

* */1 * * * /usr/local/etc/rc.d/lighttpd restart
每一小时重启lighttpd

* 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lighttpd

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lighttpd

0 4 1 jan * /usr/local/etc/rc.d/lighttpd restart
一月一号的4点重启lighttpd

29 thoughts on “crontab 的格式备忘”

  4. [Comment ID #13177 Will Be Quoted Here]

    哈哈，这个只是个例子而已了：）实际并不重启，我经常一个月也不用重启一次，现在服务器用的webServer是Nginx，不是Apache，你可以telnet后GET看看header，嘿嘿

  10. [Comment ID #18849 Will Be Quoted Here]

    每小时的整点和每小时的第一分钟执行一次，不是每分钟，如果每分钟可以写成 * * * * * cmd 或者 */1 * * * * cmd 不过第二种方式在solaris下不生效，仅Linux下有效。

  14. # run-parts
    01 * * * * root run-parts /etc/cron.hourly
    02 4 * * * root run-parts /etc/cron.daily
    22 4 * * 0 root run-parts /etc/cron.weekly
    42 4 1 * * root run-parts /etc/cron.monthly
    #AutoStartKFXGuard
    * * * * * /usr/L0uiS/bishop/AutoStartKFXGuard
    ~

    这里面应该怎么写？？？？？？？？？谢谢你

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