hwo to update my github fork with remote content code example

Example 1: update my fork repository at github

# Add the remote, call it "upstream":

git remote add upstream https://github.com/whoever/whatever.git

# Fetch all the branches of that remote into remote-tracking branches,
# such as upstream/master:

git fetch upstream

# Make sure that you're on your master branch:

git checkout master

# Rewrite your master branch so that any commits of yours that
# aren't already in upstream/master are replayed on top of that
# other branch:

git rebase upstream/master

Example 2: git pull updates from fork

$ cd github-services
$ git remote add upstream git://github.com/pjhyett/github-services.git
$ git fetch upstream

# then: (like "git pull" which is fetch + merge)
$ git merge upstream/master master

# or, better, replay your local work on top of the fetched branch
# like a "git pull --rebase"
$ 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

Example 4: github howto contribute fork 2 commits behind

# Clone your fork
git clone [email protected]:YOUR-USERNAME/YOUR-FORKED-REPO.git

# Add remote from original repository in your forked repository
cd into/cloned/fork-repo
git remote add upstream git://github.com/ORIGINAL-DEV-USERNAME/REPO-YOU-FORKED-FROM.git
git fetch upstream

# Update your frk from original repo to keep up with their changes
git pull upstream master