自动安装mysql数据库的shell脚本

#!/bin/bash
#mysql安装（集群）
main_path=/root/mysql/
install_name=mysql-max-5.0.24-linux-i686.tar.gz
install_path=/usr/local/mysql/
env_fun() #环境
{
echo "-------检测本机环境，请稍等-------"
username=`cat /etc/passwd|grep mysql|cut -c 1-5`
        if [ $username = "mysql" ];then
                echo "用户检测：mysql已存在"
                return 10
        else
                echo "用户检测：mysql用户不存在,添加"
                groupadd mysql
                useradd mysql -g mysql
                return 12
        fi
}
#判断mysql是否安装(rpm、source)
check_fun()
{ # www.jb200.com
rpm_name=`rpm -aq |grep mysql-server`
        if [ ! $rpm_name ];then
                echo "开始检测源码包是否安装,请稍等......"
                        if [ -d $install_path ];then
                                echo "源码:$install_path目录已存在,退出本次安装."
                                exit 0
                        else
                                echo "本机未安装任何mysql程序,将为您开始安装$install_name.请稍等......"
                                install_fun
                        fi

        else
                echo -n "rpm mysql已安装,是否删除?[yes|no]"
                read select
                        if [ $select = yes ];then
                                rpm -ev $rpm_name --nodeps
                                rm -rf /var/log/mysqld.log
                                check_fun
                        else
                                exit 0
                        fi
        fi
}
install_fun() #安装函数
{
cd $main_path
echo "正在解压，请稍等......"
tar zxvf $install_name
echo "建立相应目录"
echo "mkdir -p /usr/local/mysql/"
mkdir -p /usr/local/mysql/
echo "mkdir -p /usr/local/mysql/data/"
mkdir -p /usr/local/mysql/data/
cd mysql-max-5.0.24-linux-i686/bin/
echo "cp ndb_mgm* /usr/local/mysql/"
cp ndb_mgm* /usr/local/mysql/
echo "chown -R mysql:mysql /usr/local/mysql/"
chown -R mysql:mysql /usr/local/mysql/
#配置
}
main()
{
echo "#***********************************#"
echo "# 欢迎使用mysql集群安装脚本 #"
echo "# Copyright 2013 by wanggy #"
echo "#***********************************#"
sleep 3
#开始执行，调用检测函数
env_fun
re=$?
if [ re = 10 ];then
        check_fun
else
        check_fun
fi
}
main
exit 0