To setup email notification, login to your server as root.

Edit .bashrc

vim .bashrc

add the following line at the end, changing "ServerName" to the host-name of your server and "" to your own email address.

echo 'ALERT - Root Shell Access (Server-name) on:' `date` `who` | mail -s "Alert: Root Access from `who | cut -d"(" -f2 | cut -d")" -f1`"

Save and exit.

Next time someone (hopefully you) logs on as root, you will get an email about this.