使用ssh key
- 检查SSH keys是否存在
输入下面的命令，如果有文件id_rsa.pub 或 id_dsa.pub，则直接进入步骤3将SSH key添加到GitHub中，否则进入第二步生成SSH key
ls -al ~/.ssh
Lists the files in your .ssh directory, if they exist
like ls: /Users/eddy/.ssh: No such file or directory 则没有ssh key
- 生成新的ssh key
第一步：生成public/private rsa key pair
在命令行中输入ssh-keygen -t rsa -C "your_email@example.com"
或者ssh-keygen -t rsa
默认会在相应路径下（/your_home_path）生成id_rsa和id_rsa.pub两个文件，如下面代码所示
ssh-keygen -t rsa -C "your_email@example.com"# Creates a new ssh key using the provided emailGenerating public/private rsa key pair.
Enter file in which to save the key (/your_home_path/.ssh/id_rsa):
第二步：输入passphrase（本步骤可以跳过）
设置passphrase后，进行版本控制时，每次与GitHub通信都会要求输入passphrase，以避免某些“失误”
Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]
第三步：将新生成的key添加到ssh-agent中:
start the ssh-agent in the backgroundeval "$(ssh-agent -s)"Agent pid 59566ssh-add ~/.ssh/id_rsa
测试：
eddytekiMBP:~ eddy$ eval "$(ssh-agent -s)"
Agent pid 1871
eddytekiMBP:~ eddy$ ssh-add ~/.ssh/id_rsa
Identity added: /Users/eddy/.ssh/id_rsa (/Users/eddy/.ssh/id_rsa)
eddytekiMBP:~ eddy$
- 将ssh key添加到GitHub中
用自己喜欢的文本编辑器打开id_rsa.pub文件，里面的信息即为SSH key，将这些信息复制到GitHub的Add SSH key页面即可
不同的操作系统，均有一些命令，直接将SSH key从文件拷贝到粘贴板中，如下：
mac
pbcopy < ~/.ssh/id_rsa.pub# Copies the contents of the id_rsa.pub file to your clipboard
windows
clip < ~/.ssh/id_rsa.pub# Copies the contents of the id_rsa.pub file to your clipboard
linux
sudo apt-get install xclip# Downloads and installs xclip. If you don't have apt-get, you might need to use another installer (like yum)xclip -sel clip < ~/.ssh/id_rsa.pub# Copies the contents of the id_rsa.pub file to your clipboard
ssh-keygen -f "~/.ssh/known_hosts" -R 192.168.1.254
