安装交叉编译器出问题了，

./arm-2010q1-202-arm-none-linux-gnueabi.bin

错误信息如下；

Checking for required programs: awk grep sed bzip2 gunzip
===============================================================
Error: DASH shell not supported as system shell
===============================================================
The installer has detected that your system uses the dash shell
as /bin/sh.  This shell is not supported by the installer.
You can work around this problem by changing /bin/sh to be a
symbolic link to a supported shell such as bash.
For example, on Ubuntu systems, execute this shell command:
   % sudo dpkg-reconfigure -plow dash
   Install as /bin/sh? No
Please refer to the Getting Started guide for more information,
or contact CodeSourcery Support for assistance.

Google搜：

http://www.51testing.com/html/38/225738-208702.html

Ubuntu下sh默认指向dash 。
echo $SHELL  -->  /bin/bash
type sh      -->  /bin/sh
然后我到/bin下看了有"sh -> dash"，原来sh是/bin/dash的链接。
后来google了一下才发现，buntu6.10已将先前默认的bashshell更换为了dash。其表现是/bin/sh链接到了/bin/dash而不是传统的/bin/bash。
bash - GNU Bourne-Again SHell
dash - Debian Almquist Shell
可以分别man bash  / man dash看一下。

那么怎么把sh改为指向bash呢？
最暴力的方法当然是直接把/bin/sh的软链接改到bash中，
如：ln -s /bin/bash /bin/sh
但是，有优雅一些的方法,
sudo dpkg-reconfigure dash
出现菜单问你是否要dash的时候，选no就可以了。

先看看链接：

cuigang@cui:~$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 2010-10-12 17:04 /bin/sh -> dash

按照出错的提示信息

   sudo dpkg-reconfigure -plow dash
   Install as /bin/sh? No

就可以了，再看看链接：

cuigang@cui:~$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 2010-10-12 16:52 /bin/sh -> bash

那么Dash是什么东西呢

DASH

Description

DASH is a POSIX-compliant implementation of /bin/sh that aims to be as small as possible. It does this without sacrificing speed where possible. In fact, it is significantly faster than bash (the GNU Bourne-Again SHell) for most tasks.

比bash小而快的东西

最后

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