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源：https://help.github.com/articles/generating-ssh-keys/
评：如果是用git命令行 在第三步  1中   选择 eval $(ssh-agent -s) 命令

SSH / Generating SSH keys
Generating SSH keys

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    windows
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    all

SSH keys are a way to identify trusted computers, without involving passwords. The steps below will walk you through generating an SSH key and adding the public key to your GitHub account.

We recommend that you regularly review your SSH keys list and revoke any that haven't been used in a while.

Tip: If you have GitHub for Windows installed, you can use it to clone repositories and not deal with SSH keys. It also comes with the Git Bash tool, which is the preferred way of running git commands on Windows.
Step 1: Check for SSH keys

First, we need to check for existing SSH keys on your computer. Open Git Bash and enter:

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 the public keys are one of the following:

    id_dsa.pub
    id_ecdsa.pub
    id_ed25519.pub
    id_rsa.pub

Step 2: Generate a new SSH key

    With Git Bash still open, copy and paste the text below. Make sure you substitute in your GitHub email address.

    ssh-keygen -t rsa -C "[e-mail]"
    # Creates a new ssh key, using the provided email as a label
    # Generating public/private rsa key pair.

    We strongly suggest keeping the default settings as they are, so when you're prompted to "Enter a file in which to save the key", just press Enter to continue.

    # Enter file in which to save the key (/Users/you/.ssh/id_rsa): [Press enter]

    You'll be asked to enter a passphrase.

    # Enter passphrase (empty for no passphrase): [Type a passphrase]
    # Enter same passphrase again: [Type passphrase again]

    Tip: We strongly recommend a very good, secure passphrase. For more information, see "Working with SSH key passphrases".

    After you enter a passphrase, you'll be given the fingerprint, or id, of your SSH key. It will look something like this:

    # Your identification has been saved in /Users/you/.ssh/id_rsa.
    # Your public key has been saved in /Users/you/.ssh/id_rsa.pub.
    # The key fingerprint is:
    # 01:0f:f4:3b:ca:85:d6:17:a1:7d:f0:68:9d:f0:a2:db [e-mail]

Step 3: Add your key to the ssh-agent

To configure the ssh-agent program to use the SSH key you've generated:

If you have GitHub for Windows installed, you can use it to clone repositories and not deal with SSH keys. It also comes with the Git Bash tool, which is the preferred way of running git commands on Windows.

    Ensure ssh-agent is enabled:

        If you are using Git Bash, turn on ssh-agent:

        # start the ssh-agent in the background
        ssh-agent -s
        # Agent pid 59566

        If you are using another terminal prompt, such as msysgit, turn on ssh-agent:

        # start the ssh-agent in the background
        eval $(ssh-agent -s)
        # Agent pid 59566

    Add your generated SSH key to the ssh-agent:

    ssh-add ~/.ssh/id_rsa

Step 4: Add your SSH key to your account

To configure your GitHub account to use your SSH key:

Copy the SSH key to your clipboard. If your key is named id_dsa.pub, id_ecdsa.pub or id_ed25519.pub, then change the filename below from id_rsa.pub to the one that matches your key:

clip < ~/.ssh/id_rsa.pub
# Copies the contents of the id_rsa.pub file to your clipboard

Warning: It's important to copy the key exactly without adding newlines or whitespace.

Add the copied key to GitHub:

    Settings icon in the user barIn the top right corner of any page, click .

    SSH keysIn the user settings sidebar, click SSH keys.

    SSH Key buttonClick Add SSH key.
    In the Title field, add a descriptive label for the new key. For example, if you're using a personal Mac, you might call this key "Personal MacBook Air".
    The key fieldPaste your key into the "Key" field.
    The Add key buttonClick Add key.
    Confirm the action by entering your GitHub password.

Step 5: Test the connection

To make sure everything is working, you'll now try to SSH into . When you do this, you will be asked to authenticate this action using your password, which is the SSH key passphrase you created earlier.

    Open Git Bash and enter:

    ssh -T [e-mail]
    # Attempts to ssh to GitHub

    You may see this warning:

    # The authenticity of host 'github.com (207.97.227.239)' can't be established.
    # RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
    # Are you sure you want to continue connecting (yes/no)?

    Verify the fingerprint in the message you see matches the following message, then type yes:

    # Hi username! You've successfully authenticated, but GitHub does not
    # provide shell access.

    If the username in the message is yours, you've successfully set up your SSH key!

    If you receive a message about "access denied," you can read these instructions for diagnosing the issue.

    If you're switching from HTTPS to SSH, you'll now need to update your remote repository URLs. For more information, see Changing a remote's URL.