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1. Start the ssh-agent in the background.

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

If you're using macOS Sierra 10.12.2 or later, you will need to modify your ~/.ssh/config file to automatically load keys into the ssh-agent and store passphrases in your keychain.

```
Host bitbucket.org-username
 HostName bitbucket.org
 User git
 AddKeysToAgent yes
 UseKeychain yes
 IdentityFile ~/.ssh/id_rsa
 IdentitiesOnly yes
```

Add your SSH private key to the ssh-agent and store your passphrase in the keychain. 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 -K ~/.ssh/id_rsa
```