Mine

#!/bin/bash

set -x

SIS="`lspci | grep "VGA"| grep "SIS"`"
#echo $SIS
VIA="`lspci | grep "VGA"| grep "VIA"`"
#echo $VIA
if [ "$SIS" = "$VIA" ]; then
    	echo sis detected
else
	echo via detected
elif [ "$SIS" =! "$VIA" ]
then
	echo then done
fi