Centos7.9yum切换本地源、阿里yum源、网易yum源、华为yum源以及清华大学yum源自动化Shell程序

#!/bin/bash
#
#########################################################
# Function :Yum源更新切换源                      	    #
# Platform :Centos7.9                                   #
# Version  :2.0                                         #
# Date     :2023-09-15                                  #
# devops   :Shen_Zhao                                   #
#########################################################
if [[ `id -u` != "0" ]]; then
    echo "not root!"
    exit 1;
fi
sleep 3
wget=$(rpm -qa |grep wget)
if [ $? -eq 0 ]
then
    echo "软件包wgat已安装即将进入下一步."
else
    yum install wget -y
    echo "即将安装wget软件包."
fi
read -p "请输入需要切换的yum源的序号,如1.本地源、2.阿里云镜像源、3.163镜像源、4.华为镜像源、5.清华镜像源:" qh
case "$qh" in
    1)
    echo "您选择的是本地源,即将开始切换."
    mkdir /mnt/ncw                    
    mount /dev/cdrom /mnt/ncw
    if [ $? -eq 0 ];then
    echo "挂载成功,即将进入下一步."
else
    echo "挂载失败,请检查是