Shell script to find when user su'ed to root

Shell Programming and Scripting
1

Does anybody know how to make a shell script that finds all the times that any user su'ed to root and create a cron job sends that file output via e-mail to one user?
Thanks!:confused:

2

grep "\-root" /var/adm/sulog | mailx -s"users su to root" youremail@yourdomain.com