A helpful bash script that allows you to simply

gup.sh

#!/bin/bash
# 
# gup BRANCH
#
# Update origin with upstream for a specified branch. This allows you to update a branch on your forked repo
# with the most up-to-date version on the parent, all via the CLI.
#
# Note* This function assumes the following remotes:
#   1. `origin` - Refers to your forked repository, required;
#   2. `upstream` - The parent of your forked repository.

function gup () {
  if [[ -z "$1" ]]; then
    echo "ERROR: Please specify a branch name! E.g."
    echo "    gup BRANCH"
    return 1
  fi
  git fetch upstream && git co $1 && git pull upstream $1 && git push origin $1
}