Commonly used commands in the Crontab similar to Windows Task Manager and examples for reference.

editing the current user’s crontab file

crontab -e

listing the current user’s crontab file

crontab -l

removing the current user’s crontab file

crontab -r

COMMON EXAMPLES

run every minute

* * * * * /path_to_task_to_run.sh

run every hour at minute 15

15 * * * * /path_to_task_to_run.sh

run every day at 6:30 PM

30 18 * * * /path_to_task_to_run.sh

run every Monday at 10:03 PM

3 22 * * 1 /path_to_task_to_run.sh

run on the 1st of every Month at 6:10 AM

10 6 1 * * /path_to_task_to_run.sh

run every hour at minute 1, 20 and 35

1,20,35 * * * * /path_to_task_to_run.sh

run every two hour at minute 10

10 */2 * * * /path_to_task_to_run.sh

run once a year on the 1st of January at midnight

@yearly /path_to_task_to_run.sh

run once a month at midnight on the first day of the month

@monthly /path_to_task_to_run.sh

run once a week at midnight on Sunday

@weekly /path_to_task_to_run.sh

once an hour at the beginning of the hour

@hourly /path_to_task_to_run.sh

run at boot time

@reboot /path_to_task_to_run.sh

All scripts in following directories will run as root at that interval:
/etc/cron.hourly
/etc/cron.daily
/etc/cron.hourly
/etc/cron.monthly
/etc/cron.weekly

#