tangling files with org-mode

I've been inspecting this repo https://github.com/kinnala/nixpkgs, and it was the first time I looked at the org tangling. Quite simple to do so:

Mostly using ":mkdirp yes :tangle path", is like doing a "cat block >>path". And you use (org-babel-tangle) as the exporter

#+begin_src elisp :mkdirp yes :tangle ~/.emacs
(org-babel-tangle)
#+end_src