如何在Cpanel每天6点钟完成cron工作

Question

how to make cron job every day at 6 O'clock by Cpanel ? I added cron job by my cpanel as this picture

http://i.imgur.com/vc1iv.jpg

But the script work more one time in the day , I need to know the error in cron or in my script .

Answer 1

Your cron will run every minute at 6 o'clock, because of that asterisk.

Cron format :

* * * * * *
| | | | | | 
| | | | | +-- Year              (range: 1900-3000)
| | | | +---- Day of the Week   (range: 1-7, 1 standing for Monday)
| | | +------ Month of the Year (range: 1-12)
| | +-------- Day of the Month  (range: 1-31)
| +---------- Hour              (range: 0-23)
+------------ Minute            (range: 0-59)
Any of these 6 fields may be an asterisk (*). 
This would mean the entire range of possible values, i.e. each minute, each hour, etc.

You should put minute 0 because you need to run it just once (at 06:00).

0 6 * * * 

Answer 2

You should change your cronjob like following:

0 6 * * * /usr/bin/php and so on

In this way it will run at 6 o'clock. In your way, it will start running at 6 and then it will run again every minute for an hour.

As example, if you want a script to run on the 3rd day of the month at midnight, you should write:

0 0 3 * * /usr/bin/php and so on

If you leave asterisk on the first two field, it will run for the whole day.

Have a look to the man page . Some example can be very useful, ie the one with @daily macro.