step1:下载安装包
#wget https://mirrors.edge.kernel.org/pub/software/scm/git/git-2.9.5.tar.gz
step2:解压安装包
# tar -zxf git-2.9.5.tar.gz
step3:安装
# cd git-2.9.5
# make prefix=/usr/local all
# sudo make prefix=/usr/local install
step4:验证是否安装成功
# git --version
git version 2.9.5