sed -e "s|^mirrorlist=|#mirrorlist=|g" -e "s|^#baseurl=http://mirror.centos.org/centos/\$releasever|baseurl=https://mirrors.ustc.edu.cn/centos-vault/$minorver|g" -i.bak /etc/yum.repos.d/CentOS-*.repo
```
- 替换 `CentOS-CR.repo` 并且 `enable`（安装python3需要）
```shell
sed -i "s|^baseurl=http://mirror.centos.org/centos/\$releasever|baseurl=https://mirrors.ustc.edu.cn/centos-vault/$minorver|g;s|enabled=0|enabled=1|g" /etc/yum.repos.d/CentOS-CR.repo
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