打开 Terminal（终端）Terminal（终端）Git Bash。
ls -al ~/.sshto see if existing SSH keys are present.
$ ls -al ~/.ssh # Lists the files in your .ssh directory, if they exist
Check the directory listing to see if you already have a public SSH key. By default, the filenames of supported public keys for GitHub Enterprise Server are one of the following.
Tip: If you receive an error that ~/.ssh doesn't exist, you do not have an existing SSH key pair in the default location. You can create a new SSH key pair in the next step.
Either generate a new SSH key or upload an existing key.
If you don't have a supported public and private key pair, or don't wish to use any that are available, generate a new SSH key.
If you see an existing public and private key pair listed (for example, id_rsa.pub and id_rsa) that you would like to use to connect to GitHub Enterprise Server, you can add the key to the ssh-agent.
For more information about generation of a new SSH key or addition of an existing key to the ssh-agent, see "Generating a new SSH key and adding it to the ssh-agent."
Checking for existing SSH keys
Before you generate an SSH key, you can check to see if you have any existing SSH keys.