
reply=o

while [ $reply = o ]
  do
    echo "> \c"

    read reply

    if [ "$reply" = "" ]
      then
        reply=o
    fi

    if [ $reply = Y ] || [ $reply = yes ] || [ $reply = Yes ] ||
                                                          [ $reply = YES ]
      then
        reply=y
    fi

    if [ $reply = N ] || [ $reply = no ] || [ $reply = No ] || [ $reply = NO ]
      then
        reply=n
    fi

    if [ $reply = n ]
      then
        exit 1
    fi

    if [ $reply = y ]
      then
        exit 0
    fi

    reply=o

  done
