Usually, when writing in LaTeX, one would like to comment and/or un-comment a section of the manuscript.
There is a package which allow you to comment a portion of the file. However, I found out that one can customize Emacs for inserting/remove a percentage sign at the beginning
of each line of a selected region.
Change the .emacs file
In order to do so, one should change the .emacs file.
(defun uncomment-region (beg end) "Uncomment a region of text" (interactive "r") (comment-region beg end -1)); (global-set-key "\C-c;" 'comment-region) (global-set-key "\C-c:" 'uncomment-region)
Start using the new feature
Next time you open Emacs, you could select a region and use C-c ; for comment the region. Or if it is commented, use C-c : for un-comment it.