解决Linux：-bash: mysql: 未找到命令 问题

问题一、解决Linux：bash: mysql: 未找到命令…

1、查看MySQL服务是否启动

 systemctl status mysql

2、查看MySQL运行环境

 echo $PATH（可查看所有服务位置）

3、暂停MySQL服务

service MySQL stop

4、在/etc/profile配置系统环境变量

exportPATH=$PATH:(MySQL的bin目录)

5、让profile文件立即生效

source /etc/profile或./etc/profile

抄录于秀_儿

二、文件搜索失败: cannot update repo ‘appstream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist

解决 Failed to search for file: cannot update repo ‘appstream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist
因为Centos 8已经停止维护，所以需要改变镜像。

cd /etc/yum.repos.d/

sudosed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

sudosed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

抄录于Javier_Ji