yum 源

安装软件报错，改yum源，

Error: Package: R-core-devel-3.6.0-1.el7.x86_64 (epel)            Requires: pcre2-devel

解决办法：

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
sed -i  ‘s/$releasever/7/g‘ /etc/yum.repos.d/CentOS-Base.repo
yum repolist 

yum 源

原文：https://www.cnblogs.com/xk-bench/p/14047520.html