git操作之一台mac电脑绑定两个git账号，用于工作和学习区分

$ cd ~/.ssh
$ ls

可以看到有id_rsa.pub和id_rsa这1对密钥了

ssh-keygen -t rsa -f ~/.ssh/id_rsa_2 -C "yourmail@xxx.com"

输入命令后会出现让你输密码，可以直接回车，此时输入命令ls就可以看到多出现了一对id_rsa_study.pub和id_rsa_study密钥了

点击头像➡️Settings➡️SSH and GPG keys➡️SSH Keys➡️New SSH key

可以执行open id_rsa_study.pub打开该文件进行复制

$ touch ~/.ssh/config
$ open config

直接打开config文件作为文档进行编辑

#Default GitHub
Host github.com
    HostName github.com
    PreferredAuthentications publickey
    IdentityFile ~/.ssh/id_rsa
#Study GitHub
Host study.github.com
    HostName github.com
    PreferredAuthentications publickey
    IdentityFile ~/.ssh/id_rsa_study

$ssh -T git@study.github.com