Table of contents
Introduction to scheduled tasks
Introduction to scheduled task examples
It is not easy to organize, please read it carefully, I hope it will be helpful to you
Introduction to scheduled tasks
View crontab: crontab -l
Edit crontab: crontab -e
Delete crontab: crontab -r
Start: systemctl start crond.service
Stop: systemctl stop crond.service
Restart: systemctl restart crond.service
Introduction to scheduled task examples
Example 1: Executed at the 3rd and 15th minutes from 8am to 11am
3,15 8-11 * * * command
Example 2: Executed at the 3rd and 15th minutes from 8am to 11am every two days
3,15 8-11 */2 * * command
Example 3: Execution at the 3rd and 15th minutes from 8am to 11am every Monday
3,15 8-11 * * 1 command
Example 4: Restart smb at 21:30 every night
30 21 * * * /etc/init.d/smb restart
Example 5: Restart smb at 4:45 on the 1st, 10th, and 22nd of every month
45 4 1,10,22 * * /etc/init.d/smb restart
Example 6: Restart smb every 30 minutes between 18:00 and 23:00 every day
0,30 18-23 * * * /etc/init.d/smb restart
Example 7: Restart smb every hour
* */1 * * * /etc/init.d/smb restart
Example 8: Restart smb every hour between 11pm and 7am
* 23-7/1 * * * /etc/init.d/smb restart
Example 9: Execute the script in the /etc/cron.hourly directory every hour
01 * * * * root run-parts /etc/cron.hourly
Set up auto-start at power on
# because /etc/rc.d/rc.local
Add the following:
systemctl start crond.service
