.zshenv

function ghUpdate() {
  if git remote | grep upstream > /dev/null; then
    echo "upstream is set"
  elif [ -z "$1" ]; then
    read "?Whats the URl of the original repo? " answer
    git remote add upstream $answer
  else
    git remote add upstream $1
  fi
  git fetch upstream
  git checkout master
  git rebase upstream/master
}