confirm_n() {
    MSG="$@"

    while [ : ]; do
        echo -n $MSG
        echo -n " [y/N] "

        read reply
        if [ "$reply" = "y" -o "$reply" = "Y" ]; then
            CONFIRMED=1
            break
        else
            if [ "$reply" = "n" -o "$reply" = "N" -o "$reply" = "" ]; then
                CONFIRMED=0
                break
            fi
        fi
    done
}

confirm_n "################################SOME MESSAGE"

if [ "$CONFIRMED" = "1" ]; then
    #######################################SOME ACTION
fi