配置git ssh key

1.  设置Git的user name和email：(如果是第一次的话)

$ git config --global user.name "ue90"
$ git config --global user.email "[e-mail]"

配置完成后可以通过

vim ~/.gitconfig

查看、修改配置，内容如下：

[user]
        name = ue90
        email = [e-mail]

2.    生成密钥

ssh-keygen -t rsa -C "[e-mail]"

如果不需要密码的话，连续三个回车，就可以了。在~/.ssh/目录下会生成id_rsa和id_rsa.pub两个文件。

$ ssh-keygen -t rsa -C "[e-mail]"
Generating public/private rsa key pair.
Enter file in which to save the key (/c/Users/lj/.ssh/id_rsa):
Created directory '/c/Users/lj/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /c/Users/lj/.ssh/id_rsa.
Your public key has been saved in /c/Users/lj/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:WHtPVMrdlDy6A0FeW7lIiRlmkL/m3ag007PLcrS4zEw [e-mail]
The key's randomart image is:
+---[RSA 2048]----+
| .+=+.+.+|
| .+=.*oB |
| . ..*.+ +|
| o . + o . |
| . S . + . |
| . =.+ |
| oE=o= . |
| *++=o. |
| *=+. |
+----[SHA256]-----+

3.    添加密钥到ssh-agent
确保 ssh-agent 是可用的。ssh-agent是一种控制用来保存公钥身份验证所使用的私钥的程序，其实ssh-agent就是一个密钥管理器，运行ssh-agent以后，使用ssh-add将私钥交给ssh-agent保管，其他程序需要身份验证的时候可以将验证申请交给ssh-agent来完成整个认证过程。

#验证ssh-agent是否在运行
eval "$(ssh-agent -s)"
Agent pid 12356

添加生成的 SSH key 到 ssh-agent

ssh-add ~/.ssh/id_rsa

4.    登陆git添加ssh key
    登陆github官网：    

    

按照以上步骤将~/.ssh/id_rsa.pub中的公钥信息添加到github中。

5.    测试

ssh -T [e-mail]

在git bash中输入以上命令，会看到

$ ssh -T [e-mail]
The authenticity of host 'github.com (192.30.255.113)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,192.30.255.113' (RSA) to the list of know                                                                                                                n hosts.
Hi ue90! You've successfully authenticated, but GitHub does not provide shell access.

完成以上5步就可以从github下载代码了。