SSH (OpenSSH) 10 · ~/.ssh/config

Use a specific key for GitHub

Use a dedicated key for one service.

Host github.com
    User git
    IdentityFile ~/.ssh/github_ed25519
    IdentitiesOnly yes

Official SSH (OpenSSH) 10 documentation

More ~/.ssh/config commands

All ~/.ssh/config commands · SSH (OpenSSH) 10 cheatsheet

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