By default, the git command uses the default SSH key pairs to communicate with GitHub.com. When you have different accounts and work on different projects, you need to do some special setup.

Generate a new SSH key specifically for this account:

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

1. Copy your public SSH key to the clipboard (for Windows):

   cat ~/.ssh/oap_key.pub | clip

   For macOS:

   pbcopy < ~/.ssh/oap_key.pub

   For Linux (with xclip installed):

   xclip -sel clip < ~/.ssh/oap_key.pub

2. Go to your GitHub account on github.com, login, and navigate:

   • Go to Settings under your account
   • Select SSH and GPG keys
   • Click New SSH key button, paste your key there

To check your setup is correct, you can run:

ssh -T [email protected]

Configure your SSH to recognize a new profile for GitHub using a specific key:

# Default GitHub 
Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_rsa
  IdentitiesOnly yes

# New config for specific account
Host oap.github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/oap_key   
  IdentitiesOnly yes

Now your system can recognize oap.github.com as an alias for github.com.

ssh -T [email protected]

If everything is set up correctly, you'll see a message from GitHub stating that you've successfully authenticated, but GitHub does not provide shell access.

Clone your repository using the new SSH configuration:

git clone [email protected]:oap/oap_git_test.git

Open the .git/config file in a text editor and modify it as follows:

[remote "origin"]
    url = [email protected]:oap/oap_git_test.git
    fetch = +refs/heads/*:refs/remotes/origin/*

To ensure that your configuration works, run:

git fetch origin