ssh-keygen -C "user@example.com" -f id_rsa -P ""
ssh-keygen -C "userAzure@example.com" -f azure -P ""
ssh -T git@ssh.dev.azure.com
ssh-keygen -C "userGithub@example.com" -f github -P ""
ssh -T git@github.com
# azure devops
Host ssh.dev.azure.com
IdentityFile ~/.ssh/azure
HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedAlgorithms +ssh-rsa
# github
Host github.com
User git
Hostname github.com
IdentityFile ~/.ssh/github
PreferredAuthentications publickey