;; clone line as on netbeans
(defun clone-line-below()
  "Copy the current line below."
  (interactive)
  (beginning-of-line)
  (kill-line)
  (yank)
  (newline)
  (yank)
  (beginning-of-line))

(global-set-key [C-S-down] 'clone-line-below)

(defun clone-line-above()
  "Copy the current line above."
  (interactive)
  (beginning-of-line)
  (kill-line)
  (yank)
  (newline)
  (yank)
  (beginning-of-line))

(global-set-key [C-S-up] 'clone-line-above)