CentOS中yum里没有Git，需要手动安装。
首先需要安装git的依赖包
yum install curl
yum install curl-devel
yum install zlib-devel
yum install openssl-devel
yum install perl
yum install cpio
yum install expat-devel
yum install gettext-devel
下载最新的git包
wget http://www.codemonkey.org.uk/projects/git-snapshots/git/git-latest.tar.gz
tar xzvf git-latest.tar.gz
cd git-xxxx-xx-xx
autoconf
./configure
make | make install
验证是否安装成功：检查安装的版本
git –version