How to work with cron ? tips and tricks

Modified on Thu, 18 Jan 2024 at 11:26 AM

Running PHP script on hosting


/usr/local/bin/php /home/account/domains/example.org/public_html/taskcron.php



Running a script with logging


/usr/local/bin/php /home/account/domains/example.org/public_html/taskcron.php > out.log 2> error.log



Alternative script startup


/usr/bin/wget -O /dev/null http://youdomain/youmegascript.php


Start time parameters


Each record in the schedules file consists of six fields:


  1. Minute

  2. Hour

  3. Day of the month

  4. Month

  5. Day of the week

  6. The string to be run with sh


Minutes and hours should range from 0 to 59 and 0 to 12, respectively, and day of the month and month should range from 1 to 31 and 1 to 12, respectively. The day of the week varies from 0 to 6, where 0 corresponds to Sunday. It can also be denoted as sun, mon, tue, etc. The sixth field is the command or script.


If it is required to run, for example, every 5 minutes, there is no need to make many tasks. It is enough to make one task:

*/5 * * * * * * * /usr/bin/wget -O /dev/null http://youdomain/youmegascript.php


When running scripts, specify the full path to the file



Recommendations when forming an assignment


The correct way to enter the time is with digits and *.

You can use a comma as a separator to set the time. e.g.: 1,2,3 (minutes 1,2 and 3).


To specify a range, you can use a hyphen for example: 5-7 (minutes 5 through 7)

You can also use an asterisk and a slash to specify intervals. e.g.: */2 (every two minutes)


You can combine all of the above methods for flexible customization. for example: 1,5,11-15,30-59/2 (minutes 1, 5, 11 through 15 and every two minutes between 30 and 59 minutes)

No spaces

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