How to set up and switch multiple Github accounts

Recently, I needed to use different Github accounts to access different repos on my work computer. After encountering some issues, I finally managed to set it up, and now I can freely switch accounts to access different repos.

Create SSH keys for each account: Generate a new SSH key and add it to the SSH agent

ssh-keygen -t ed25519 -C "[email protected]" -f ~/.ssh/github_a

ssh-keygen -t ed25519 -C "[email protected]" -f ~/.ssh/github_b

Add the public keys (github_a.pub, github_b.pub) to their respective Github accounts: Go to Github > settings > SSH and GPG keys.
Start the ssh-agent in the background.

$ eval "$(ssh-agent -s)"

Add the private keys of the generated keys to the ssh-agent.

ssh-add ~/.ssh/github_a
ssh-add ~/.ssh/github_b

Edit the ~/.ssh/config file.

vim ~/.ssh/config

Host gtihub_q
  HostName github.com
  AddKeysToAgent yes
  User git
  UseKeychain yes
  IdentityFile ~/.ssh/github_a

Host github_b
  HostName github.com
  AddKeysToAgent yes
  User git
  UseKeychain yes
  IdentityFile ~/.ssh/github_b

Use the following commands to log in and clone the repository.

ssh -T git@github_a
git clone git@github_a:XXXXX/XXXXX.git

It is important to modify the default command given by the repository when cloning. Change git clone [email protected]:XXXXX/XXXXX.git to git clone git@github_a:XXXXX/XXXXX.git.

If you have already cloned the repository, you need to modify the remote origin. Change the original source:

origin  [email protected]:xxxxx/xxxxx.git (fetch)
origin  [email protected]:xxxxx/xxxxx.git (push)

to:

origin  git@github_a:xxxxx/xxxxx.git (fetch)
origin  git@github_a:xxxxx/xxxxx.git (push)

This way, you can access different repos without constantly switching accounts.