As per a recent change to GITHUB authentication, you will now see this error:
remote: Permission to ProfessorBrownBear/20240119A.git denied to computationalknowledge.
fatal: unable to access 'https://github.com/ProfessorBrownBear/20240119A/': The requested URL returned error: 403 Error 403 Forbidden error error occurs when trying to access a repository. This error indicates a permissions issue. You need to login at the git command line with your git account credentials To log in to your Git account via the command line, especially for GitHub, you need to set up authentication using either HTTPS or SSH. Since GitHub no longer supports password authentication for Git operations, you'll need to use a personal access token (PAT) for HTTPS or set up an SSH key. Here's how to do both: Using HTTPS with a Personal Access Token (PAT)
Generate a Personal Access Token (PAT) on GitHub: Go to your GitHub account settings. Find the “Developer settings” section. Select “Personal access tokens” and then “Generate new token”. Give your token a descriptive name, select the scopes (permissions) you need, and create the token. Important: Make sure to copy the token and keep it somewhere safe, as you won’t be able to see it again after leaving the page. Using the PAT on the Command Line: When you perform Git operations (like git clone, git fetch, git push, etc.), use your GitHub username, and when prompted for a password, enter the PAT instead of your GitHub password. Using SSH
Generate an SSH Key Pair: Open a terminal or command prompt. Run ssh-keygen -t ed25519 -C "your_email@example.com", replacing your_email@example.com with your email. Follow the prompts to create the key pair and save it to a file (typically in ~/.ssh/id_ed25519). Add the SSH Key to the SSH-Agent: Start the ssh-agent in the background: eval "$(ssh-agent -s)" Add your SSH private key to the ssh-agent: ssh-add ~/.ssh/id_ed25519 Add the SSH Public Key to GitHub: Copy your SSH public key to the clipboard. On Linux or macOS, you can use pbcopy < ~/.ssh/id_ed25519.pub or xclip -sel clip < ~/.ssh/id_ed25519.pub. Go to GitHub, navigate to “Settings” → “SSH and GPG keys”. Click “New SSH key”, paste your key, and save it. Clone Repositories Using SSH: When cloning repositories, use the SSH URL instead of the HTTPS URL. Additional Tips
Remember: After setting up SSH or PAT, you don’t need to “log in” each time you use Git. Git will remember your authentication method. Cache Credentials: If you're using HTTPS, you can cache your GitHub credentials for a period of time using Git’s credential helper: git config --global credential.helper cache. Choose the method that suits your workflow best. For a more secure and convenient method, SSH is generally preferred, but PATs work well too, especially if you're working in environments where SSH is not ideal.