Shell Script Menu for Start up/Shutdown SAP with Oracle and other process (saposcol,sapstartsrv,hostctl for NW7.1)

** Myself
#====================================================================
#
# MAIN PROGRAM: Operator Menu
#
# PURPOSE:  Checks for system instances and
#           startup/shutdown system instances
#
#====================================================================
#====================================================================
# Environment
#====================================================================
#
#
#
# oracle user  ,Please change
orasid=dev
# sap user ,Please change
sapsid=dev
# SAP StartSRV MC Console Instant Name ,Please change ,for more instant add array
SAPINST[0]=DVEBMGS02
SAPINST[1]=ASCS00
SAPINST[2]=SCS01
#
#====================================================================
#====================================================================
# Main
#====================================================================
operation_menu=0
while [[ ! "x${operation_menu}x" = "x99x" ]] ; do
clear
echo "========================================"
echo "|--- Operation Menu (`hostname`) "
echo "========================================"
echo "(1) Start SAP"
echo "(2) Shutdown SAP"
echo "(99) Exit"
echo "Please select a number from the Operation Menu: "
read operation_menu
case ${operation_menu} in
        1)
                su - ora${orasid} -c "lsnrctl start"
                su - ${sapsid}adm -c "startsap"
                echo "SAP Startup"
                echo "Please key to Main Menu: "

               read
                ;;
        2)
                echo "Are you sure you want to Stop SAP ? [N/y]: "
                read Answer
                if [ "${Answer:="N"}" = "y" -o "${Answer:="N"}" = "Y" -o "${Answer:="N"}" = "yes" -o "${Answer:="N"}" = "Yes" ] ; then
                        su - ${sapsid}adm -c "stopsap"
                        su - ${sapsid}adm -c "saposcol -k"
            i=0
            while (( i <  ${#SAPINST[*]} ))
            do
                su - ${sapsid}adm -c "stopsap sapstartsrv ${SAPINST[${i}]}"
                        echo "SAP Stop StartSRV MC Console"
                        echo "============================="
            (( i = i + 1 ))
            done
### For  NW 7.1 Stop hostCTL by  saphostexec -stop by enable below line
#/usr/sap/hostctrl/exe/saphostexec -stop
            su - ora${orasid} -c "lsnrctl stop"
                    echo "SAP Stop"
                        echo "Press enter to continue: \c"
                        read waiting
                elif [ "${Answer:="N"}" != "n" -a "${Answer:="N"}" != "N" -a "${Answer:="N"}" != "no" -a "${Answer:="N"}" != "No" ] ; then
                        echo "!!! Please choose Yes or No !!!"
                        sleep 1
                fi
                ;;
        99)
                ;;
        *)
                echo "!!! Please select a number from the list !!!"
                sleep 1
                ;;
esac
done