1.安装需要的依赖

第一步我们需要做的就是确认系统已经安装了编译git时需要的依赖。使用下面的安装命令即可（已经安装过的不会重新再安装）

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
yum install gcc
yum install perl-ExtUtils-MakeMaker

当然，为了快速安装，你可以把上面命令写在一行中，一次执行

yum install crul curl-devel zlib-devel openssl-devel perl cpio expat-devel gettext-devel gcc perl-ExtUtils-MakeMaker

2.下载Git

 cd /usr/src
 wget https://www.kernel.org/pub/software/scm/git/git-1.9.4.tar.gz
 tar xzf git-1.9.4.tar.gz

3.编译

cd git-1.9.4
autoconf
./configure
make
make install

运行autoconf命令时，如果终端提示no command的话就执行yum install autoconf命令后再试

4.重新指定git命令对应的版本

echo "export PATH=$PATH:/usr/local/git/bin" >> /etc/bashrc
source /etc/bashrc

不执行这一步将出现git版本仍然是升级前的

5.检查安装/升级后的版本是否正确

git --version

执行以上命令后应该显示

git version 1.9.4

6.安装过程中可能遇到的问题

usr/bin/perl Makefile.PL PREFIX='/usr/local/git' INSTALL_BASE='' --localedir='/usr/local/git/share/locale'
Can't locate ExtUtils/MakeMaker.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) <span class="goog_qs-tidbit goog_qs-tidbit-0">at Makefile.PL line 3.
BEGIN failed--compilation aborted at Makefile.PL line 3.

出现这个错误的原因是perl-ExtUtils-MakeMaker依赖没有安装成功，执行以下命令重新进行安装

yum install perl-ExtUtils-MakeMaker