ubuntu发行版中的sh命令的区别

用ubuntu 9.10执行
$ sh build_me.sh -b  -j -L lex
命令的时候，出现error message,如下
-------------------------------------------
(cd basis/build/linux-am34-bluraypan; sh build_me.sh -b  -j -L lex)
[: 133: unexpected operator
[: 133: unexpected operator
***Error: DirectFB path point to an invalid path
Hint: you can set DirectFB path by:
1. setenv MEI2_TOOLCHAIN_JAVA_DIR your_directfb_path
2. use -D build switch, type build_me.sh -h for help
make[4]: *** [install] エラー 1
...
...
-------------------------------------------

而在其他的linux发行版中，执行同样的命令时，无此error message，正常执行。


所以，在ubuntu发行版下,查看sh命令。
$ cd /bin
$ ls -l
lrwxrwxrwx 1 root root      4 2010-01-07 22:00 sh -> dash
实际上，sh命令链接的是dash(Debian-shell)


而在其他的linux发行版下，例如fedora、vine
lrwxrwxrwx 1 root root      4 12月 2日 16:40 sh -> bash
他们的sh链接的都是bash

所以将ubuntu中的sh和bash链接在一起。
$ sudo dpkg-reconfigure dash（可见dash的说明文）
选择[NO]

dash的说明文:================
The default /bin/sh on Debian and Debian-based systems is bash.
However,since the default shell is required to be POSIX-compliant, any shell that conforms to POSIX,such as dash, can serve as /bin/sh. You may wish to do this because is faster and smaller than bash.

Install dash as /bin/sh
       
=============================


其他参考链接:

http://hi.baidu.com/nako521/blog/item/248fee953b52454fd1135eb7.html