Git pulling changes between two local repositories

You can treat the second clone the same way you treat a remote respository on another system. You can perform all of the same operations, e.g.

~/repo1 $ git remote add repo2 ~/repo2
~/repo1 $ git fetch repo2
~/repo1 $ git merge repo2/foo

To add to djs response. After you add the local repo you can treat it as master, so all the other git commands work as normal.

For example if you have made some changes in directory A and save it in commits. To retrieve those changes in directory B (same computer) you simply open a terminal in that directory and you git pull

git pull

This will copy any changes in directory A. I use this system so that I can have a "development" environment (dir A) and a "production" environment (dir B). I only git pull in dir B