We can record some schedule task at Linux. To do this we can use crontab command. We can add a scheduled task by command:
crontab -e
At the very first we should understand the basic structure of crontab command.
* * * * * Command
1st * is the minutes of hour (0-59)
2nd * is the hour of day (0-23)
3rd star means day of month (1-31)
4th * means month of year (1-12)
5th * means day of week (0-6)
Now,
crontab -e
10 9 * * * cp /etc/passwd /backup
This command will copy /etc/passwd file at /backup every day 9.10 am
crontab -e
*/10 * * * * cp /etc/passwd /backup
This command will copy /etc/passwd file at /backup after every 10 minutes.
10,30 9,17 * * 6 cp /etc/passwd /backup
This command will copy /etc/passwd file at /backup every friday at hour between 9am and 5 pm and minute between 10min-30min
To check the scheduled list we can use
crontab -l
To remove schedule task we can use
crontab -r
