这个答案是给初学者的(非git大师)。我最近遇到了这个问题，也许这只是我的问题，但大多数答案似乎需要对git有相当深入的了解。在阅读了包括这个线程在内的几个堆栈溢出的答案后，下面是我需要采取的步骤，以便在GitHub帐户之间轻松切换(例如，假设有两个GitHub帐户，github.com/personal和gitHub.com/work):

Check for existing ssh keys: Open Terminal and run this command to see/list existing ssh keys ls -al ~/.ssh files with extension .pub are your ssh keys so you should have two for the personal and work accounts. If there is only one or none, its time to generate other wise skip this.- Generating ssh key: login to github (either the personal or work acc.), navigate to Settings and copy the associated email.now go back to Terminal and run ssh-keygen -t rsa -C "the copied email", you'll see:Generating public/private rsa key pair. Enter file in which to save the key (/.../.ssh/id_rsa): id_rsa is the default name for the soon to be generated ssh key so copy the path and rename the default, e.g. /.../.ssh/id_rsa_work if generating for work account. provide a password or just enter to ignore and, you'll read something like The key's randomart image is: and the image. done.Repeat this step once more for your second github account. Make sure you use the right email address and a different ssh key name (e.g. id_rsa_personal) to avoid overwriting. At this stage, you should see two ssh keys when running ls -al ~/.ssh again. Associate ssh key with gitHub account: Next step is to copy one of the ssh keys, run this but replacing your own ssh key name: pbcopy < ~/.ssh/id_rsa_work.pub, replace id_rsa_work.pub with what you called yours.Now that our ssh key is copied to clipboard, go back to github account [Make sure you're logged in to work account if the ssh key you copied is id_rsa_work] and navigate toSettings - SSH and GPG Keys and click on New SSH key button (not New GPG key btw :D) give some title for this key, paste the key and click on Add SSH key. You've now either successfully added the ssh key or noticed it has been there all along which is fine (or you got an error because you selected New GPG key instead of New SSH key :D). Associate ssh key with gitHub account: Repeat the above step for your second account. Edit the global git configuration: Last step is to make sure the global configuration file is aware of all github accounts (so to say). Run git config --global --edit to edit this global file, if this opens vim and you don't know how to use it, press i to enter Insert mode, edit the file as below, and press esc followed by :wq to exit insert mode: [inside this square brackets give a name to the followed acc.] name = github_username email = github_emailaddress [any other name] name = github_username email = github_email [credential] helper = osxkeychain useHttpPath = true

完成了!现在，当尝试从一个回购中推或拉，你会被问到哪个GitHub账户应该与这个回购链接，它只被问到一次，本地配置将记住这个链接，而不是全局配置，所以你可以在不同的回购上工作，链接到不同的账户，而不必每次编辑全局配置。

不像其他答案，在那里你需要遵循几个步骤来使用两个不同的github帐户从同一台机器，对我来说，它在两个步骤。

你只需要:

1)在~/下为您的每个帐户生成SSH公私钥对。使用不同的名称和SSH位置

2)在“设置”中，将生成的公钥添加到对应的帐号“>> SSH和GPG密钥>> SSH新密钥”。

使用实例生成SSH公私钥对。

cd ~/.ssh
ssh-keygen -t rsa -C "email@work.com" -f "id_rsa_WORK"
ssh-keygen -t rsa -C "email@gmail.com" -f "id_rsa_PERSONAL"

作为上述命令的结果，id_rsa_WORK和id_rsa_WORK。pub文件将为您的工作帐户(ex - git.work.com)和id_rsa_PERSONAL和id_rsa_PERSONAL创建。Pub将为您的个人帐户(ex - github.com)创建。

创建之后，从每个公共(*.pub)文件复制内容，并对每个帐户执行步骤2。

PS:没有必要为~/下的每个git帐户创建一个主机条目。Ssh /配置文件，如在其他答案中提到的，如果您的两个帐户的主机名不同。

导航到要将更改推到另一个GitHub帐户的目录。 在终端/命令行中创建一个新的SSH密钥。 ssh-keygen -t rsa -C " your-email-address " 下面将显示: 生成rsa公私钥对。 输入保存密钥的文件(/home/your_username/.ssh/id_rsa):

复制并粘贴路径，后面跟着一个可识别的文件名:

/home/your_username/.ssh/id_rsa_personal

4)然后它会问你以下问题:

Enter passphrase (empty for no passphrase):
Enter same passphrase again:

5)您现在可以输入以下命令查看您在本地机器上拥有的所有SSH密钥:

ls -al ~/.ssh

您应该能够看到新的SSH密钥文件。正如你可以看到在我的一个，我有id_rsa_test和id_rsa_personal.pub。

drwx------  2 gmadmin gmadmin 4096 Nov 16 22:20 .
drwxr-xr-x 42 gmadmin gmadmin 4096 Nov 16 21:03 ..
-rw-------  1 gmadmin gmadmin 1766 Nov 16 22:20 id_rsa_personal
-rw-r--r--  1 gmadmin gmadmin  414 Nov 16 22:20 id_rsa_personal.pub
-rw-r--r--  1 gmadmin gmadmin  444 Nov  6 11:32 known_hosts

6)接下来需要复制存储在id_rsa_personal中的SSH密钥。酒吧文件。您可以在您选择的文本编辑器中打开此文件。我目前正在使用atom，所以我使用以下命令打开文件:

atom ~/.ssh/id_rsa_personal.pub

然后你会得到类似这样的结果:

ssh-rsa AAB3HKJLKC1yc2EAAAADAQABAAAAQCgU5+ELtwsKkmcoeF3hNd7d6CjW+dWut83R/DC01E/YzLc5ZFri18doOwuQoeTPpmIRVDGuQQsZshjDrTkFy8rwKWMlXl7va5olnGICcpg4qydEtsW+MELDmayW1HHsi2xHMMGHlNv

7)复制并导航到您的GitHub帐户→设置→SSH和GPG密钥 8)单击“新建SSH密钥”。复制键，给它一个标题并添加它。 9)从终端添加密钥

ssh-add ~/.ssh/id_rsa_personal
Enter passphrase for /home/your_username/.ssh/id_rsa_personal: 

10)配置用户和密码。

git config --global user.name "gitusername"
git config --global user.email "gitemail"

11)我们已经做好了承诺和推进的准备。

git init
git add .
git commit 
git push

我使用shell脚本将我切换到任何我想要“活跃”的帐户。从本质上讲，您可以从头开始，正确配置一个帐户并正常工作，然后将这些文件移动到具有适当前缀的名称。从那时起，你可以使用命令“github”，或“gitxyz”切换:

# my github script
cd ~/.ssh

if [ -f git_dhoerl -a -f git_dhoerl.pub -a -f config_dhoerl ]
then
    ; 
else 
    echo "Error: missing new files"
    exit 1
fi 

# Save a copy in /tmp, just in case
cp id_rsa /tmp
cp id_rsa.pub /tmp
cp config /tmp
echo "Saved old files in /tmp, just in case"

rm id_rsa
rm id_rsa.pub
rm config
echo "Removed current links/files"

ln git_dhoerl id_rsa
ln git_dhoerl.pub id_rsa.pub
ln config_dhoerl config

git config --global user.email "dhoerl@<company>.com"
git config --global github.user "dhoerl"        
git config --global github.token "whatever_it_is"

ssh-add -D

我在这方面运气不错。我还在Xcode中创建了一个运行脚本(为Mac用户)，所以它不会构建我的项目，除非我有适当的设置(因为它使用git):

运行脚本放在Dependencies之后(使用/bin/ksh作为shell):

if [ "$(git config --global --get user.email)" != "dhoerl@<company>.com" ]
then
    exit 1
fi

编辑:添加测试新文件是否存在，并将旧文件复制到/tmp以解决下面@naomik的注释。

如果您已经创建或克隆了另一个存储库，并且无法从原点或上游提取，则使用以下命令在该目录中添加ssh密钥是有效的。

这是我得到的错误:

Warning: Permanently added the RSA host key for IP address '61:fd9b::8c52:7203' to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

我使用了下面的命令，这是有效的:

ssh-add ~ / . ssh / id_rsa_YOUR_COMPANY_NAME

只要在你最喜欢的编辑器中添加这一行，你就完成了一生

git remote set-url origin https://user-token-of-particular-user@github.com/profile-name/repo-name