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shelltishi：:~$ sudo ./bashr0
A mistake occurs when I echo var!
Linux woshishui 2.6.24-18-generic #1 SMP Wed May 28 20:27:26 UTC 2008 i686 GNU/Linux
Now the bash cannot echo $WOSHISHUI

Can't out put WOSHISHUI
shelltishi：:~$


但是在shell下执行是可以输出的：
shelltishi：:~$ echo $WOSHISHUI
/mnt/woshishui
shelltishi：:~$
shelltishi：:~$ sudo echo $WOSHISHUI
/mnt/woshishui
shelltishi：:~$

脚本如下：
#! /bin/bash
echo "A mistake occurs when I echo var! "
uname -a
echo 'Now the bash cannot echo $WOSHISHUI'
echo $WOSHISHUI
echo "Can't out put WOSHISHUI"
exit 0




bash --version
GNU bash, version 3.2.39(1)-release (i486-pc-linux-gnu)
Copyright (C) 2007 Free Software Foundation, Inc.
echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD/$HOME/~}\007"
这是什么原因呢？

因为你那脚本里根本没有 WOSHISHUI

WOSHISHUI 在父 shell 里