version control - git diff between cloned and original remote repository

Question

I have cloned a github repository and made no changes locally. Github repository moved forward with commits on the same branch.

1. How do I find a diff between my local repository and the original github repository?
2. How do I find a diff between my working copy and the original github repository?
3. How do I find a diff between my local repository and another github repository of the same project?

Answer 1

1) Add any remote repositories you want to compare:

git remote add foobar git://github.com/user/foobar.git

2) Update your local copy of a remote:

git fetch foobar

Fetch won't change your working copy.

3) Compare any branch from your local repository to any remote you've added:

git diff master foobar/master