updating forked repo code example
Example 1: update fork repository
git remote add upstream https://github.com/OriginalOwner/OriginalProject.git
git remote -v
git fetch upstream
git checkout master
git merge upstream/master
git push origin master
Example 2: update my fork repository at github
git remote add upstream https://github.com/whoever/whatever.git
git fetch upstream
git checkout master
git rebase upstream/master
Example 3: git update fork from original repo
$ git remote add upstream https://github.com/[Original Owner Username]/[Original Repository].git
$ git fetch upstream
$ git checkout master
$ git merge upstream/master
$ git push