Update Forked Repository with Bash

upstream.sh

#!/bin/bash
git fetch upstream
git checkout master
git merge upstream/master
git merge upstream/master
 
# If your upstream branch is already setup using 
# https://help.github.com/articles/configuring-a-remote-for-a-fork/
# then you can run this simple shell script to update your fork quickly and easily.
# RUN: $ bash upstream.sh