git-contribute.sh

# 0. clone/fork repo,

# 1. add remote upstream
git remote add upstream https://github.com/xx/xx.git

# 2. checkout work branch
git checkout -b work

# If you are trying to "checkout" a new remote branch (that exists only on the remote, but not locally)
git fetch origin
git checkout --track origin/<remote_branch_name>

while not done:
  # do the work, and commit to the work branch

  # 3. sync with upstream
  git pull --rebase # need to git branch --set-upstream-to=upstream/master work
  # or below two steps
  git fetch upstream
  git rebase upstream/master

  # 4. push to the remote work branch (should be ready to send pull request)
  # if the pull request is merged, better checkout a new branch from the upstream/master