git: How do you add an external directory to the repository?

Question

I want to add an external directory to an existing repository.

External Dir: /home/some/directory

Working Dir: /htdocs/.git

If I attempt the followin

Answer 1

If the code that you want to add to your repo is not too big, you could also automatically copy it to your repo each time before you push.

In my case I for example need one R file, which I modify quite often, in several repos and I wrote a little shell script:

#!/usr/bin/env bash

cp -r /some/directory/file.R .
git add .
git commit -m "add"
git push

...and I run this script in order to push all changes, including the ones in /some/directory.