求助一个关于中括号条件判断式的问题

[海贼的童话]

还是编shell的新手，今天试编了一下shell程序，可是在中括号的条件判断是中出现了问题

代码： 全选

#!/bin/bash
# program:
#	This program will show the user's choice
# History:
#	2010/4/10	susu 	First release
PATH=:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
read -p "Please input choice: " choice
[ "$choice" == "Y" -o "$choice" == "y"]  &&echo "Ok,continue" &&exit 0这里的空格符号，我非常注意了，就是每个部分中间都要有空格
[ "$choice" == "N" -o "$choice" == "n"]  &&echo "Oh,interrupt" &&exit 0
echo "I don't know what is your choice"

可是确出现如下问题
Please input choice: n
./sh06.sh: line 10: [n：找不到命令
./sh06.sh: line 11: [n：找不到命令
I don't know what is your choice
请大牛解答，再问个小问题，就是面板上面的nm-applet怎么重现显示，就是我不小心把它从面板上删除了，现在无法切换网络状态了

[JiangHui]

代码： 全选

#!/bin/bash
# program:
#   This program will show the user's choice
# History:
#   2010/4/10   susu    First release
PATH=:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
read -p "Please input choice: " choice
[ "$choice" == "Y" -o "$choice" == "y" ]  &&echo "Ok,continue" &&exit 0 #这里的空格符号，我非常注意了，就是每个部分中间都要有空格
[ "$choice" == "N" -o "$choice" == "n" ]  &&echo "Oh,interrupt" &&exit 0
echo "I don't know what is your choice"

[海贼的童话]

代码： 全选

#!/bin/bash
# program:
#   This program will show the user's choice
# History:
#   2010/4/10   susu    First release
PATH=:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
read -p "Please input choice: " choice
[ "$choice" == "Y" -o "$choice" == "y" ]  &&echo "Ok,continue" &&exit 0 #这里的空格符号，我非常注意了，就是每个部分中间都要有空格
[ "$choice" == "N" -o "$choice" == "n" ]  &&echo "Oh,interrupt" &&exit 0
echo "I don't know what is your choice"

什么什么？是否可以解决？

[JiangHui]

帮你改了，复制上去

[海贼的童话]

帮你改了，复制上去

啊，是哪里有问题呀，是否可以指教一下？

[JiangHui]

就是空格问题啊

[海贼的童话]

就是空格问题啊

对不起，我还是没有看出来，抱歉
我明明是按照要求写的空格啊，就是把所有的一个栏目都要加上空格啦，难道有什么不同吗？

[JiangHui]

用vimdiff比较下两个文件

右边的中括号

[海贼的童话]

代码： 全选

#!/bin/bash
# program:
#   This program will show the user's choice
# History:
#   2010/4/10   susu    First release
PATH=:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
read -p "Please input choice: " choice
[ "$choice" == "Y" -o "$choice" == "y" ]  &&echo "Ok,continue" &&exit 0 #这里的空格符号，我非常注意了，就是每个部分中间都要有空格
[ "$choice" == "N" -o "$choice" == "n" ]  &&echo "Oh,interrupt" &&exit 0
echo "I don't know what is your choice"

什么什么？是否可以解决？

我刚刚发现一个问题，就是加上可执行的属性后，./sh06.sh(这个文件时这个名字）完全正常
但是如果继续用sh sh06.sh就会重新出现那个问题，请问这是怎么回事？
如下所示
Please input choice: Y
Ok,continue
susu@susu17:29:38:~/scripts$ ./sh06.sh
Please input choice: N
Oh,interrupt
susu@susu17:29:41:~/scripts$ sh sh06.sh
Please input choice: y
[: 10: y: unexpected operator
[: 11: y: unexpected operator
I don't know what is your choice

[JiangHui]

怎么可能直接执行就行，sh 方式就不行？
rpwt？

[JiangHui]

ls -l /bin/sh 是不是指向bash？难道是这个原因？

[海贼的童话]

ls -l /bin/sh 是不是指向bash？难道是这个原因？

恩～～确实是的，我的
ls -l /bin/sh指向的是 dash 需要怎么更改呀？

[JiangHui]

重新软链接一下

[海贼的童话]

重新软链接一下

它总是说该符号已经存在，是不是命令不对呀
ln -s /bin/sh bash

[JiangHui]

敲反了


不知道改了Ubuntu默认sh会不会有什么难以预料的问题，bash 06.sh 也是一样