Someone

#!/bin/bash
echo "You only need to select one resolution, then select option #4 to quit."
mv /etc/X11/xorg.conf /etc/X11/xorg.bck
showMenu () {
echo "1)1600x1200"
echo "2)1440x900 "
echo "3)1280x1024"
echo "4)quit"
}

while [ 1 ]
do
showMenu
read CHOICE
case "$CHOICE" in
"1")
echo "ok"
sed -e 's/"1024x768"/"1600x1200"/g' /etc/X11/xorg.bck > /etc/X11/xorg.conf
;;
"2")
echo "ok"
sed -e 's/"1024x768"/"1440x900"/g' /etc/X11/xorg.bck > /etc/X11/xorg.conf
;;
"3")
echo "ok"
sed -e 's/"1024x768"/"1280x1024"/g' /etc/X11/xorg.bck > /etc/X11/xorg.conf
;;
"4")
exit
;;
esac
done