repeat=1

while :; do
    case $1 in
    -r)
        repeat=$2
        shift
        ;;
    --)
        shift
        break
        ;;
    *)
        break
        ;;
    esac

    shift
done

name=${1:-world}

for (( i=0; i < repeat; ++i )); do
    echo "Hello, $name!"
done