使用shell 脚本为centos 服务器自动配置阿里云yum源

#!/usr/bin/env bash
##this is yum configure script
##author xw 2018.3.19 
system_osversion=`cat /etc/redhat-release | awk ' {print $4}' | awk -F"." '{print $1"."$2}'`

if [ "$system_osversion" = "7.4" ];then
       mkdir -p /etc/yum.repos.d/bak
       mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak
       curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
       
elif [ "$system_osversion" = "6.7" ];then
       mkdir -p /etc/yum.repos.d/bak
       mv /etc/repos.d/*.repo /etc/yum.repos.d/bak
       curl -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo 
        
elif [ "$system_osversion" = "5.8" ];then 
     mkdir /etc/yum.repos.d/bak
     mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak
     
else
     echo "error please talk administrator"
fi
yum clean all
yum makecache 
yum install -y vim