准备工做：
下载安装git客户端 http://code.google.com/p/git-osx-installer/downloads/list?can=3
注册github帐号 https://github.com/ -->Pricing and Signup -->Create a free account
建立ssh：
在local打开terminal：
$cd ～/.ssh 检查是否已经存在ssh
若是存在，先将已有的ssh备份，或者将新建的ssh生成到另外的目录下
若是不存在，经过默认的参数直接生成ssh
生成过程以下：
$ssh-keygen -t rsa -C xxxxx@gmail.com（注册github时的email）
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/twer/.ssh/id_rsa):
Created directory '/Users/twer/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /Users/twer/.ssh/id_rsa.
Your public key has been saved in /Users/twer/.ssh/id_rsa.pub.
The key fingerprint is:
18:16:11:c9:01:6c:48:09:7f:27:c6:43:0d:7f:3f:84 xxxxx@gmail.com
The key's randomart image is:
+--[ RSA 2048]----+
|.o.++=== |
|.ooo.+. . |
| ..* = E . |
| o = + o |
| . S o |
| . |
| |
| |
| |
+-----------------+
若是要修改ssh生成目录，在蓝色位置处输入要生成的路径，选择默认的话，会生成在 ～/.ssh下
在github中添加ssh：
登录github，选择Account Settings-->SSH Public Keys 添加ssh
Title：xxxxx@gmail.com
Key：打开你生成的id_rsa.pub文件，将其中内容拷贝至此
测试SSH：
$ssh git@github.com
The authenticity of host 'github.com (207.97.227.239)' can't be established.
RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,207.97.227.239' (RSA) to the list of known hosts.
PTY allocation request failed on channel 0
Hi xianfuying! You've successfully authenticated, but GitHub does not provide shell access.
Connection to github.com closed.
在蓝色位置处输入 yes
设置本地git我的信息：
$git config --global user.name "your real name"
$git config --global user.email "xxxxx@gmail.com"
至此，git和github的设置就完成了，下面就是如何将本地代码push到github上，以及如何从github上pull代码了：
在github中建立Repository：
https://github.com/ --> New Repository 输入Repository信息 projectName
在本地建立代码库：
建立一个文件夹做为local repository
$mkdir test
建立一个文件
$cd test
$vi test.txt
将文件添加至local repository
$git add test.txt
初始化local repository
$git init
commit文件
$git commit -a
定义远程服务器别名
$git remote add alias git@github.com:xxxxx/projectName.git
将本地数据push到github上
$git push alias master
这样就能够将本地的代码push到github的repository中了
从github中pull代码：
在github中搜到你想要pull的代码，如https://github.com/edgecase/ruby_koans
选择fork，将此repository fock到你的repository下
在本地建立local repository并初始化
使用命令：
$git pull git@github.com:xxxxx/ruby_koans.git
将github上的代码pull到local repository中
参考：
http://apps.hi.baidu.com/share/detail/16068052
http://blog.csdn.net/banxi1988/article/details/6555293
http://apps.hi.baidu.com/share/detail/31697631