The crontab of Linux commands

Format:

crontab [-u user] {-l |-r |-e}

The format of the crontab file is "M H d M D cmd".

where m stands for minutes (0~59), H for hours (0~23), D for Day (1~31), M for month (1~12), d for Day of week (0~6,0 for Sunday). CMD represents the program to be run, it is sent to sh execution, the shell only user, HOME, shell three environment variables.

Parameters:

-E: Executes the text editor to set the time table, the empty text editor is VI
-R: Delete the current schedule table
-l lists the current schedule table.

Example:

To view the cron settings for root: Crontab–u root–l

Delete root cron settings: Crontab–u root–r

#MIN       hour     day       MONTH   dayofweek       COMMAND

#每天早上6点10分

10    6      *     *     *     Date

#每两个小时

0     */2   *     *     *      Date

#晚上11点到早上8点之间每两个小时, 8 in the morning

0     23-7/2,8       *     *     *     Date

#每个月的4号和每个礼拜一到礼拜三的早上11点

0     11    4     *      1-3  Date

#1月1日早上4点

0     4      1     1       *  date

Crontab of Linux commands