The cron daemon is a long running process that executes commands at specific dates and times. To schedule one-time only tasks with cron, use ator batch. For commands that need to be executed repeatedly (e.g. hourly, daily or weekly), use crontab, which has the following options:
crontab filename
Install filename as your crontab file.
crontab -e
Edit your crontab file.
crontab -l
Show your crontab file.
crontab -r
Remove your crontab file.
MAILTO=us...