我的代码：

    #!/bin/sh
    #filename:choose.sh
    read choose
    [ "$choose" == "y" -o "$choose" == "Y" ] && echo "Yes" && exit 0
    [ "$choose" == "n" -o "$choose" == "N" ] && echo "No"  && exit 0
    echo "Wrong Input" && exit 0

但是当我执行

    sh ./choose.sh

终端提示我

   [: 4: n: :Unexpected operator
   [: 5: n: :Unexpected operator

我的bash脚本有什么错误吗？谢谢！