Question

I am trying to set the global key for the C-; key by placing the below code in init.el file.

(global-set-key "\C-;" 'backward-kill-word)

But this gives the following error in the *Warning* buffer

error "Invalid modifier in string"

Answer 1

try this,

 (global-set-key [(control ?\;)] 'backward-kill-word)

another way and I guess most easiest way of doing is with kbd function

 (global-set-key (kbd "C-;") 'backward-kill-word)