diff --git a/_posts/software/git_v2_install.md b/_posts/software/git_v2_install.md
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+## yum软件源安装
+
+用yum install git 在centos 默认安装的git版本是 1.8.3.1 太低了
+
+```
+yum install git
+```
+
+
+
+```
+# git --version
+git version 1.8.3.1
+```
+
+
+
+## 源码包安装
+
+步骤1. 安装依赖包
+
+```
+# yum install curl-devel expat-devel gettext-devel openssl-devel zlib-devel
+# yum install  gcc perl-ExtUtils-MakeMaker
+```
+
+上面的软件不一定全部安装，可以用下面的命令检查，已经安装的就不用安装了。
+
+```
+yum list installed |grep xxx  
+```
+
+
+
+步骤2. 卸载旧的git版本（如果之前有安装rpm包）
+
+```
+# yum remove git
+```
+
+步骤3. 下载&解压
+
+> 源码文件（当前最新版本 **v2.16.1** @ **2018年2月9日**）
+>
+> \- 地址1：https://www.kernel.org/pub/software/scm/git/
+> \- 地址2：[https://github.com/git/git/release](https://github.com/git/git/releases)
+
+```
+# cd /usr/src
+# wget https://www.kernel.org/pub/software/scm/git/git-2.5.0.tar.gz
+# tar -zxvf git-2.5.0.tar.gz
+```
+
+步骤4. 编译安装
+
+```
+# cd git-2.5.0
+# make prefix=/usr/local/git all
+# make prefix=/usr/local/git install
+# echo "export PATH=$PATH:/usr/local/git/bin" >> /etc/bashrc
+# source /etc/bashrc
+```
+
+步骤5. 检查git版本
+
+```
+# git --version
+git version 2.5.0
+```
+
+ 
+
+**注意：如果安装完查看版本不是我们安装的最新版，请重新执行下面的操作**
+
+```
+# yum remove -y git
+# source /etc/bashrc
+# git --version
+```
+
+ 
+
+参考：
+
+- https://github.com/git/git/blob/master/INSTALL
+- http://stackoverflow.com/questions/21820715/how-to-install-latest-version-of-git-on-centos-6-x-7-x
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