I'm working with emacs (on the terminal) and I use screen to switch between terminals. The key combination Ctrl+A is grabbed by screen. Is there a way to change screen key binding?
Sure, you can change the binding in either Screen or Emacs.
I use Ctrl+\ in Screen, which is used by very few applications. It's used in the terminal to send the QUIT signal — a stronger version of Ctrl+C, which fewer applications catch and may produce a core dump. That's rarely useful, and if you need it you can press Ctrl+\ \. A bigger argument against Ctrl+\ is that it's hard to type on some keyboard layouts. Anyway, pick the key you prefer.
To change the Screen escape key, use the
escape directive in
C-a normally moves to the beginning of the line; you can use Home instead.
C-x C-a is not bound. That leaves modes with custom bindings for
C-x C-a or
C-c C-a. If you choose
C-\, it's normally bound to
toggle-input-method, which is useful if you write in multiple languages and useless otherwise. You can rebind it to a different key with
global-set-key in your
;; overrides a binding for `suspend-frame', which is also bound on `C-x C-z' (global-set-key "\C-z" toggle-input-method)
Then use Ctrl-Z instead of Ctrl-A to control screen.