git pr - Fetch GitHub pull request to a new branch

git-pr

#! /bin/bash
if [ -z "$1" ]; then
    echo "Fetch GitHub pull request to a new branch"
    echo ""
    echo "usage: git pr PULL_REQUEST_NUMBER [BRANCH_NAME]"
    exit;
fi
pr_num="$1"

if [ -z "$2" ]; then
    branch_name=pull-request-"$pr_num"
else
    branch_name="$2"
fi

git fetch origin pull/$pr_num/head:$branch_name

Create this script somewhere in your path. Don't forget to chmod +x /path/to/git-pr