One-click shell script to build local yum source

Script content:

#!/bin/bash

echo "---正在检查是否挂载镜像---"
df | grep "sr0" &> /dev/null
 if [ $? -eq 0 ];then
echo "---镜像已挂载---"
 else
echo "---镜像未挂载，正在挂载镜像---"
  mount /dev/cdrom /mnt >> /dev/null
  fi
   cd /etc/yum.repos.d
   mkdir repo.bak
   mv *.repo repo.bak
echo "---备份已完成---"
echo "[local]
name=local
baseurl=file:///mnt
gpgcheck=0
enabled=1" >local.repo
   yum clean all >> /dev/null
   yum makecache 
echo "---本地yum源搭建完成---"
cd - >> /dev/null

 fi

Execution effect: