目录
1、安装git
MAC 上安装Git主要有两种方式
首先查看电脑是否安装Git，终端输入：git
安装过则会输出：
iOSDevdeiMac:~ iosdev$ git
usage: git [--version] [--help] [-C <path>] [-c name=value]
[--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
[-p | --paginate | --no-pager] [--no-replace-objects] [--bare]
[--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
<command> [<args>]

These are common Git commands used in various situations:

start a working area (see also: git help tutorial)
clone Clone a repository into a new directory
init Create an empty Git repository or reinitialize an existing one

work on the current change (see also: git help everyday)
add Add file contents to the index
mv Move or rename a file, a directory, or a symlink
reset Reset current HEAD to the specified state
rm Remove files from the working tree and from the index

examine the history and state (see also: git help revisions)
bisect Use binary search to find the commit that introduced a bug
grep Print lines matching a pattern
log Show commit logs
show Show various types of objects
status Show the working tree status

grow, mark and tweak your common history
branch List, create, or delete branches
checkout Switch branches or restore working tree files
commit Record changes to the repository
diff Show changes between commits, commit and working tree, etc
merge Join two or more development histories together
rebase Reapply commits on top of another base tip
tag Create, list, delete or verify a tag object signed with GPG

collaborate (see also: git help workflows)
fetch Download objects and refs from another repository
pull Fetch from and integrate with another repository or a local branch
push Update remote refs along with associated objects

'git help -a' and 'git help -g' list available subcommands and some
concept guides. See 'git help <command>' or 'git help <concept>'
to read about a specific subcommand or concept.
iOSDevdeiMac:~ iosdev$
1、通过homebrew安装Git
1、安装homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
2、安装git
brew install git
2、通过Xcode安装

直接从AppStore安装Xcode，Xcode集成了Git，不过默认没有安装，你需要运行Xcode，选择菜单“Xcode”->“Preferences”，在弹出窗口中找到“Downloads”，选择“Command Line Tools”，点“Install”就可以完成安装了。

二、创建ssh key、配置git

1、设置username和email（github每次commit都会记录他们）
git config --global user.name "wenbo"
git config --global user.email "1050794513@qq.com"
2、通过终端命令创建ssh key
ssh-keygen -t rsa -C "1050794513@qq.com"
1050794513@qq.com是我的邮件名，回车会有以下输出
Last login: Sat Jan 6 14:12:16 on ttys000
WMBdeMacBook-Pro:~ WENBO$ ssh-keygen -t rsa -C "1050794513@qq.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/WENBO/.ssh/id_rsa):
/Users/WENBO/.ssh/id_rsa already exists.
Overwrite (y/n)? n
WMBdeMacBook-Pro:~ WENBO$
这里我原来已经创建过，这里我选n，没有创建过的，会要求确认路径和输入密码，我们这使用默认的一路回车就行。成功的话会在~/下生成.ssh文件夹，进去，打开id_rsa.pub，复制里面的key。
终端查看.ssh/id_rsa.pub文件
open .ssh/id_rsa.pub
回车后，就会新弹出一个终端，然后复制里面的key。
3、登录GitHub（默认你已经注册了GitHub账号），添加ssh key，点击Settings，如图

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注：
1、解决github push错误The requested URL returned error: 403 Forbidden while accessing
github push错误：
git push
error: The requested URL returned error: 403 Forbidden while accessing https://github.com/wangz/future.git/info/refs
解决方案：cd到在clone下来的工程目录下
vim .git/config
修改
[remote "origin"]
url = https://github.com/wangz/example.git
为
[remote "origin"]
url = https://wangz@github.com/wangz/example.git
再次git push，弹出框输入密码，即可提交

参考
https://www.jianshu.com/p/7edb6b838a2e