How to update GitHub forked repository

howto.sh

# Reference:
# http://stackoverflow.com/questions/7244321/how-to-update-github-forked-repository
# ==============================================================================


# 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