Git custom command to quickly checkout pull-requests from different origins as described in https://help.github.com/articles/checking-out-pull-requests-locally. Place this file somewhere in your path and git will run it everytime you type `git pr ...`

git-pr

#!/bin/bash

if [ -z "$1" ]; then
    echo "Usage: git pr [clean] [<remote>] <id-or-url>"
    echo ""
    echo "Examples:"
    echo "git pr 42                                              -->  git fetch origin pull/42/head:pr/origin/42"
    echo "git pr upstream 42                                     -->  git fetch upstream pull/42/head:pr/upstream/42"
    echo "git pr https://github.com/peerigon/phridge/pull/1      -->  git fetch https://github.com/peerigon/phridge.git pull/1/head:pr/peerigon/phridge/1"
    echo "git pr clean                                           -->  Deletes all branches that match pr/*/* and pr/*/*/*"
    exit 1
elif [ -z "$2" ]; then
    id=$1
    remote=origin
else
    id=$2
    remote=$1
fi

if [[ $id = "clean" ]]; then
    git for-each-ref refs/heads/pr/*/* refs/heads/pr/*/*/* --format='%(refname)' | while read ref; do
        echo "git branch -D ${ref#refs/heads/}"
        git branch -D ${ref#refs/heads/}
    done
    exit 0
elif [[ $id =~ ^(https?://[^/]+/(.+))/pull/([0-9]+).*$ ]]; then
    remote=${BASH_REMATCH[1]}.git
    id=${BASH_REMATCH[3]}
    branch=pr/${BASH_REMATCH[2]}/$id
else
    branch=pr/$remote/$id
fi


echo "git fetch -fu $remote pull/$id/head:$branch"
git fetch -fu $remote pull/$id/head:$branch
git checkout $branch

I think, git pr clean is not a good idea, accidentally someone can delete important branch.