registration a ssh key with Github
Answer yes to the all questions, and ~/.ssh/id_ed25519[.pub]
are generated.
$ ssh-keygen -t ed25519 -C "[email protected]"
Settings->SSH keys->add SSH key on Github page.
Paste your ~/.ssh/id_ed25519/id_ed25519.pub.
~/.ssh/config
Host github
User git
HostName github.com
IdentityFile ~/.ssh/id_ed25519
IdentitiesOnly yes
$ ssh -T [email protected]