练习使用shell在阿里云安装MySQL

#!/bin/bash
#阿里云初始安装MySQL

#step1：查寻MariaDB 并卸载
MariaDB_filename=`rpm -qa|grep mariadb`
if [ -d "$MariaDB_filename" ]
then 
	echo "存在文件名为$MariaDB_filename"
	rpm -e --nodeps $MariaDB_filename
else
	echo "没有该文件"
fi
cd ~
#step2:搭建MySQL
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

if [ $? -eq 0 ]
then
	echo "下载完成"
	yum -y install mysql57-community-release-el7-10.noarch.rpm
	if [ $? -eq 0 ]
	then
		echo "安装完成"
		yum -y install mysql-community-server
		if [ $? -eq 0 ]
		then
			echo "安装server完成"
			systemctl start mysql.service
			if [ $? -eq 0 ]
			then
				echo "mysqlserver安装成功！"
			else
				echo "出错了！"
				echo $? 2>>/root/error.txt
			fi
		else
			echo "server 安装出错了"
			echo $? 2>>/root/error.txt
		fi		
	else：
		echo "安装出错了"
	fi
		
else
	echo "下载出错了"
	echo $? 2>/root/error.txt
fi