I would like to manage the tangling my org files with a Makefile. Though I can not find any information of how to tangle files from the command line.
You can use something like:
emacs --batch --eval "(require 'org)" --eval '(org-babel-tangle-file "file-to-tangle.org")'
(That shell quoting is meant for Bash, adjust if you use a different shell.)
EDIT: Thanks to @SkydiveMike for pointing out I had mistakenly written
org-babel-tangle instead of