github-fork-sync.sh

#!/bin/bash
# Put this in ~/.bashrc for maximum ease

github_sync() {
  if [ -z $1 ]; then
    echo "Usage: github_sync branch_name"
  else
    upstream_exists=`git show-ref | grep upstream | wc -l`
    if [[ $upstream_exists -eq 0 ]]; then
      echo "There is no upstream branch. Make sure you run:"
      echo "git remote add upstream https://github.com/___/___.git"
    else
      git fetch upstream $1
      git checkout $1
      git rebase upstream/$1
      git push --force origin master
    fi
  fi
}