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

通过在~/.ssh/config中为github.com创建不同的主机别名， 并为每个主机别名提供自己的SSH密钥，您可以轻松地使用多个 Github账户没有混淆。 这是因为github.com不是用用户来区分的，用户总是用git来区分， 但用的是你用来连接的SSH密钥。 只要使用自己的主机别名配置远程源即可。”

以上摘要来自下面博客文章的评论。

我发现这个解释是最清楚的。至少在2012年4月，这对我来说是有效的。

http://net.tutsplus.com/tutorials/tools-and-tips/how-to-work-with-github-and-multiple-accounts/

除了为多个帐户创建多个SSH密钥，您还可以考虑使用相同的帐户电子邮件在每个项目上添加合作者，并永久存储密码。

#this store the password permanently
$ git config --global credential.helper wincred

我用不同的电子邮件设置了多个帐户，然后把相同的用户和电子邮件放在每个帐户作为合作者之一。通过这种方式，我可以访问所有的帐户，无需添加SSH密钥，或切换到另一个用户名，和电子邮件进行身份验证。

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。

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。

你不需要维护两个不同的个人和工作账户。事实上，Github建议你保持一个单一的帐户，并帮助你合并两者。

如果您决定不需要维护多个帐户，请按照下面的链接进行合并。

https://help.github.com/articles/merging-multiple-user-accounts/