How to set a cron job to run every 3 hours

Question

Is this the correct way for setting a cron job to run every 3 hours   After setting it this way  cron is executing the command every minute

User · Answer

The unix setup should be like the following:

 0 */3 * * * sh cron/update_old_citations.sh

good reference for how to set various settings in cron at: http://www.thegeekstuff.com/2011/07/cron-every-5-minutes/

User · Answer

Change Minute to be 0   That s it      Note   you can check your  crons  in http   cronchecker net   Example

User · Answer

Change Minute parameter to 0   You can set the cron for every three hours as   0   3         your command here

[cron] How to set a cron job to run every 3 hours