put in root user .bashrc file
echo ‘ALERT- Root Access on:’ `date` `who` | mail -s “Alert: Root Access from `who | cut -d”(” -f2 | cut -d”)” -f1`” admin@serversignature.com
or
echo ‘ALERT- Root Access on:’ `date` `who` | mail -s “Alert: Root Access from `who –i|grep root`” admin@serversignature.com
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