Thanks for the reply. But I do need "emacs -nw" sometimes. In fact, I found
there is a solution as mentioned in the following page. Unfortunately, it is
too old and the link of the solution is bad.

http://groups.google.com/group/gnu.emacs.help/browse_thread/thread/52a4f2a4090f84c4/6e23db9b52496e66?lnk=gst&q=terminal%2Bcontrol+key&rnum=6#6e23db9b52496e66


On 9/2/07, Peter Dyballa <Peter_Dyballa@web.de> wrote:
>
>
> Am 02.09.2007 um 21:52 schrieb zhiliang.ma@gmail.com:
>
> > Does anyone has this problem, how to solve it?
>
> Don't use it in "unbuntu terminal with -nw!" This programme has a
> reduced set of keyboard events. Obviously the key combinations you
> want to use have not been programmed. As in most terminal emulations ...
>
> --
> Greetings
>
>    Pete
>
> Who the fsck is "General Failure," and why is he reading my disk?
>
>
>