markdown 管理SSH密钥

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# Generating a new SSH key and adding it to the ssh-agent
If you don't already have an SSH key, you must generate a new SSH key.

[Source](https://help.github.com/articles/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent/#generating-a-new-ssh-key)

## Generating a new SSH key

1. Open Terminal.

2. Paste the text below, substituting in your GitHub email address.

   ```
   $ ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
   ```

   This creates a new ssh key, using the provided email as a label.

   ```
   Generating public/private rsa key pair.
   ```

3. When you're prompted to "Enter a file in which to save the key," press Enter. This accepts the default file location.

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

4. At the prompt, type a secure passphrase. For more information, see "Working with SSH key passphrases".

   ```
   Enter passphrase (empty for no passphrase): [Type a passphrase]
   Enter same passphrase again: [Type passphrase again]
   ```
   
   
## Adding your SSH key to the ssh-agent

Before adding a new SSH key to the ssh-agent to manage your keys, you should have checked for existing SSH keys and generated a new SSH key.

1. Start the ssh-agent in the background.

   ```
   eval "$(ssh-agent -s)"
   Agent pid 59566
   ```

2. Add your SSH private key to the ssh-agent. If you created your key with a different name, or if you are adding an existing key that has a different name, replace id_rsa in the command with the name of your private key file.

   ```
   ssh-add ~/.ssh/id_rsa
   ```

3. Add the SSH key to your GitHub or GitLab account.

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