A bash function to quickly add a GitHub fork as a remote to your git repository.

git-remote-github-add.sh

#!/bin/bash
#
# git-remote-github-add: A bash function to quickly add a GitHub fork as a remote to your
# git repository.
#
# Copyright 2020 Morten Piibeleht
#
# License: MIT
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
# to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.

# git-remote-github-add USER
#
# It will look at the 'origin' remote of the current repository and adds another remote
# called USER where the user/org portion of the GitHub URL is replaced by user.
#
# INSTALLATION: just add this function into your .bashrc / .bash_aliases or .profile file.
function git-remote-github-add {
	user="$1"
	origin=`git remote get-url origin`
	if ! [ $? == 0 ]; then
		2>&1 echo "git-remote-github-add: Failed to run git. Not a repo?"
		return 1
	fi
	echo "origin='$origin'"
	if [[ "$origin" =~ ^(https://|git@)github\.com[:/]([A-Za-z0-9]+)/([A-Za-z0-9\._-]+)$ ]]; then
		origin_user="${BASH_REMATCH[2]}"
		repo="${BASH_REMATCH[3]}"
	else
		2>&1 echo "git-remote-github-add: Unable to match for repo in origin=$origin"
		return 2
	fi
	echo ">>" $user $repo
	echo $origin
	cmd="git remote add $user git@github.com:${user}/${repo}"
	echo "Calling: $cmd"
	$cmd
	if ! [ $? == 0 ]; then
		2>&1 echo "git-remote-github-add: Failed to run git remote add"
		return 1
	fi
	git remote -v
}