how to set Git repository and global options for multiple GitHub accounts [git] [github]

script.sh

#!/usr/bin/env bash

# let's say we have GitHub 'org' with 'team' of 2 members 
#   ('member1', 'member2') having Write access to
#   'repo' with URL of 'https://github.com/org/repo.git' 

# we are going to setup repository and global Git options
#   (on macOS) to be able to commit to 'repo' using the  
#   above GitHub user accounts including different network 
#   authentication

# configure system credential helper (e.g. for macos)
git config --system credential.helper osxkeychain
git config --system credential.usehttppath true

# remove user personal name and email from system configuration
git config --system --unset user.name
git config --system --unset user.email

# for 'member1' account

# clone repo
mkdir member1
cd member1
git clone https://github.com/org/repo.git
cd repo

# setup user personal name and email
git config user.name member1
git config user.email member1@email.io

# setup authentication credentials
git config credential.username member1

# repeat the above steps for 'member2' account
cd ../..

# clone repo
mkdir member2
cd member2
git clone https://github.com/org/repo.git
cd repo

# setup user personal name and email
git config user.name member2
git config user.email member2@email.io

# setup authentication credentials
git config credential.username member2

# now the corresponding user names/emails, and configured 
#   credential names are stored in the repo's '.git/config' 
#   and will be used by Git to push commits to GitHub