pbcopy.el

;; copy to clipboard from emacs in terminal
;;
;; if you use emacs in tmux you should enable pbcopy in tmux first
;; http://superuser.com/questions/231130/unable-to-use-pbcopy-while-in-tmux-session
;;
;; (require 'region-bindings-mode)

(defun pbcopy-region (start end)
  (interactive "r")
  (pbcopy (buffer-substring start end))
  (set-mark-command t))

(defun pbcopy (string)
  (let ((cmd (concat "echo " (shell-quote-argument string) " | pbcopy")))
    (call-process-shell-command cmd nil t)))

(define-key region-bindings-mode-map (kbd "M-RET") 'pbcopy-region)