在linux centos系统中，git安装步骤
安装git 版本：2.3.0
>> sudo yum update
>> sudo yum install curl-devel expat-devel gettext-devel openssl-devel zlib-devel gcc perl-ExtUtils-MakeMaker
>> wget https://github.com/git/git/archive/v2.3.0.zip
>> unzip v2.3.0.zip
>> cd git-2.3.0
>> make prefix=/usr/local/git all
>> sudo make prefix=/usr/local/git install
>> whereis git
>> sudo vim /etc/profile
>> export PATH=/usr/local/git/bin:$PATH
>> source /etc/profile
