How to run cron job every 2 hours?

Question

How can I write a Crontab that will run my /home/username/test.sh script every 2 hours?

Answer 1

Just do:

0 */2 * * *  /home/username/test.sh 

The 0 at the beginning means to run at the 0th minute. (If it were an *, the script would run every minute during every second hour.)

Don't forget, you can check syslog to see if it ever actually ran!

Answer 2

The line should read either:

0 0-23/2 * * * /home/username/test.sh

or

0 0,2,4,6,8,10,12,14,16,18,20,22 * * * /home/username/test.sh

Answer 3

0 */2 * * *

The answer is from https://crontab.guru/every-2-hours. It is interesting.

Answer 4

0 */1 * * * “At minute 0 past every hour.”

0 */2 * * * “At minute 0 past every 2nd hour.”

This is the proper way to set cronjobs for every hr.

Answer 5

To Enter into crontab :

crontab -e

write this into the file:

0 */2 * * * python/php/java yourfilepath

Example :0 */2 * * * python ec2-user/home/demo.py

and make sure you have keep one blank line after the last cron job in your crontab file