During export, you can include the content of another file. For example, to include your .emacs file, you could use:
#+INCLUDE: "~/.emacs" src emacs-lisp
The optional second and third parameter are
the markup (e.g. ‘quote’, ‘example’, or ‘src’), and, if the markup is
‘src’, the
language for formatting the contents. The markup is optional; if
it is not given, the text will be assumed to be in Org-mode
format and will be processed normally. The include line will also
allow additional keyword parameters :prefix1 and
:prefix to specify prefixes for the first line and
for each following line, :minlevel in order to get
org-mode content demoted to a specified level, as well as any
options accepted by the selected markup. For example, to include
a file as an item, use
#+INCLUDE: "~/snippets/xx" :prefix1 " + " :prefix " "