Configuration for multi-line editing mode in Emacs 24.

.emacs

;;; library

(let ((default-directory "~/lib/lisp"))
 (normal-top-level-add-subdirs-to-load-path))

;; multiple-cursors

; % git clone https://github.com/magnars/multiple-cursors.el.git
; % mv multiple-cursors.el lib/lisp/multiple-cursors

(require 'multiple-cursors)
(global-set-key (kbd "C-c l") 'mc/edit-lines)
(global-set-key (kbd "C-c ^") 'mc/edit-beginnings-of-lines)
(global-set-key (kbd "C-c $") 'mc/edit-ends-of-lines)
(global-set-key (kbd "C-c .") 'mc/mark-all-like-this)
(global-set-key (kbd "C-c >") 'mc/mark-next-like-this)
(global-set-key (kbd "C-c <") 'mc/mark-previous-like-this)
(global-set-key (kbd "C-c #") 'mc/insert-numbers)
(global-set-key (kbd "C-c s") 'mc/sort-regions)
(global-set-key (kbd "C-c r") 'mc/reverse-regions)

As the function string-prefix-p is only available for Emacs 23.3 or above, if you are still using older emacs (e.g., Emacs 23.1) you need to add the following code to your .emacs file:

(unless (fboundp 'string-prefix-p)
  (defun string-prefix-p (shorter longer)
    (let ((n (mismatch shorter longer))
         (l (length shorter)))
      (if (or (not n) (= n l)) l nil))))

purcell/emacs.d@26cb6ad