Vi打开某个文件，保存时提示只读时的简单做法
命令行模式下：
输入
<pre>
:w !sudo tee %
</pre>
再输入
<pre>
:q!
</pre>
现在已经保存并退出了。
用法：
<pre>
:w !sudo tee %
</pre>
:w = Write a file.<br >
!sudo = Call shell sudo command.<br >
tee = The output of the vi/vim write command is redirected using tee.<br >
% = Triggers the use of the current filename.<br >
Simply put, the ‘tee’ command is run as sudo and follows the vi/vim command on the current filename given.
