I have a fairly straight forward
.tmux.conf file which does nothing more but to define a couple of options, such as
history-limit. I have not added any custom key bindings yet.
I find it extremely annoying that I cannot unbind
C-[ as a prefix in tmux. Here is what I mean:
$ uname -a Linux stan-inspiron 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ tmux  0:~* "stan-inspiron" 10:05 12-Jun-12 % vim
vim, when I go to insert mode and then use
C-[0 to escape insert mode and move to the first character on the line, tmux grabs the key first and complains:
Window not found: :0 **
I tried all sorts of things in my
.tmux.conf, but nothing works. I thought it might be a terminal or shell issue, but confirmed same behaviour on a configless machine using Bash and [Gnome] Terminal.
So the question really is, how do I unbind the
C-[ key from tmux?
** I have
base-index 1 set.