Script - Menu based script format

#!/usr/bin/ksh
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#   MENU BASED SCRIPT FORMAT - Uses select/case statements     #
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PS3="Which option would you like to select (type number of option)?:"
clear
print "Which option would you like to select (type number of option)?:"
select option_number in option1 option2 option3 option4 quit
do
case $option_number in
option1)
echo "you have selected $option_number"
;;
option2)
echo "you have selected $option_number"
;;
option3)
echo "you have selected $option_number"
;;
option4)
echo "you have selected $option_number"
;;
quit)
print "You have selected to quit. Good Bye!"
exit ;;
*)
print "Invalid"
;;
esac
done
exit