On Oct 13, 9:53 am, zozette.mil...@gmail.com (frederic) wrote:
> Could anybody kelp me?
> I would like to write something like:
>
> if  (I'am at the beginning of buffer)
> then (add a newline)
> else (do nothing)

See

· Elisp Language Basics
http://xahlee.org/emacs/elisp_basics.html

· Simple Elisp Grab Bag!
http://xahlee.org/emacs/elisp_examples.html

what you want is shown above.

  Xah
  xah@xahlee.org
  http://xahlee.org/