sh - while; menu

while :
do
    clear
        # display menu
        echo "Server Name - $(hostname)"
    echo "-------------------------------"
    echo "     M A I N - M E N U"
    echo "-------------------------------"
    echo "1. Display date and time."
    echo "2. Display what users are doing."
    echo "3. Display network connections."
    echo "4. Exit"
        # get input from the user
    read -p "Enter your choice [ 1 -4 ] " choice
        # make decision using case..in..esac
    case $choice in
        1)
            echo "Today is $(date)"
            read -p "Press [Enter] key to continue..." readEnterKey
            ;;
        2)
            w
            read -p "Press [Enter] key to continue..." readEnterKey
            ;;
        3)
            netstat -nat
            read -p "Press [Enter] key to continue..." readEnterKey
            ;;
        4)
            echo "Bye!"
            exit 0
            ;;
        *)
            echo "Error: Invalid option..."
            read -p "Press [Enter] key to continue..." readEnterKey
            ;;
    esac

done