How do I disabling Email output?

By default the output of a command or a script (if any produced),

will be email to your local email account.

To stop receiving email output from crontab you need to append >/dev/null 2>&1.

For example:0 3 * * * /root/backup.sh >/dev/null 2>&

To mail output to particluer email account let us say [email protected]

you need to define MAILTO variable to your cron job:

MAILTO=”[email protected]

0 3 * * * /root/backup.sh >/dev/null 2>&1

More details:

http://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/