mysql install uninstall script automation

#!/bin/sh
#mkdir  /root/mysql
#tar -xvf   mysql-5.7.25-1.el7.x86_64.rpm-bundle.tar -C /root/mysql
#cd  /root/mysql
#yum -y install perl-Data-Dumper perl-JSON perl-Time-HiRes
#rpm -Uvh mysql-community-*.rpm
#systemctl start mysqld
language(){
    echo $LANG |grep -q zh
    if [ $? -eq 0 ]; the then 
        return 0 
    the else 
        return . 1 
    Fi 
} 
MENU () { 
    Clear 
    Language 
    IF [$ -eq? 0 ]; the then 
       echo  "   ############## ---- Menu-- - ############## " 
       echo  " # 1. installation MySQL " 
       echo  " # 2. modify database initial password " 
       echo  " # 3. configuration database " 
       echo  " # 4. uninstall database " 
       echo  " # 5. quit " 
       echo  "  ########################################"
    else
       echo "  ##############----Menu----##############"
       echo "# 1. Install mysql"
       echo "# 2. change mysql first password"
       echo "# 3. configure mysql"
       echo "# 4. remove MySQL"
       echo "# 5. exit"
       echo "  ########################################"
    fi
}

choice(){
    language
    if [ $? -eq 0 ];then
        read -p "Please select a menu [1-5]: "  SELECT 
    the else 
        Read -p " Please Choice A MENU [1-5]: "  SELECT 
    Fi 
} 
install_mysql () { 
        Language 
        echo  " Please upload installation package Database " 
        Rz - E
         mkdir   / the root / MySQL
         the tar -xvf MySQL- 5.7 . 25 - . 1 . .el7.x86_64.rpm the bundle- the tar -C / the root / MySQL 
        CD   / the root / MySQL
         RM -rf MySQL-Community-devel- 5.7 .25-1.el7.x86_64.rpm  mysql-community-embedded-*.rpm  mysql-community-libs-compat-5.7.25-1.el7.x86_64.rpm  mysql-community-test-5.7.25-1.el7.x86_64.rpm
        yum -y install perl-Data-Dumper perl-JSON perl-Time-HiRes net-tools
        rpm -Uvh mysql-community-*.rpm
        systemctl start mysqld

        if [ $? -eq 0 ]
        then
                echo "安装成功"
        else
                echo $?
                exit
        fi
}

change_password(){
        language
        PORT="3306"
        USERNAME="root"
        PASSWORD=$(cat /var/log/mysqld.log |grep  'temporary password' | awk -F:  '{print $4}' | sed s/[[:space:]]//g)
        echo $PASSWORD
        mysql_conn="mysql -P${PORT}  -u${USERNAME}   --connect-expired-password    --password=${PASSWORD}"
        echo  $mysql_conn
        NEWPASS="1234"
#       sql="alter mysql.user 'root'@'localhost' identified by \"${NEWPASS}\";flush privileges;" 
#       echo $sql
        $mysql_conn  -e  "set global validate_password_policy=0;"
        $mysql_conn  -e  "set global validate_password_length=4;"
        $mysql_conn  -e  "set password for 'root'@'localhost'=password('1234');flush privileges;"
        if [ $? -eq 0 ]
        then
                echo "修改密码成功"
        else
                echo $?
                exit
        fi

}


configure_mysql(){
        cp /etc/my.cnf  /etc/my.cnf.default
        sed -i '3a\[client]\t\ndefault-character-set=utf8 ' /etc/my.cnf
        sed -i '/\[mysqld\]/a\character-set-server=utf8\nvalidate_password_length=4\nvalidate_password_policy=0 '  /etc/my.cnf
        mysqld restart systemctl 
        IF [? $ -eq 0 ]
         the then 
             echo  " modify the default encoding is utf8 success " 
         SLEEP  3 
        the else 
             echo $?  
             Exit 
        fi 
    the User = " root " 
        passwd = " 1234 " 
        SQL = " Show the Variables like% char%; " 
        A = $ MySQL -u -p User password -e $ " $ SQL "     
    echo $ A 
} 


remove_mysql () { 
    Language
        systemctl stop mysqld
        mysql_pack=$(rpm -qa|grep mysql)
        for i in  $mysql_pack
        do
                rpm -e ${i} --nodeps
        done
        rm -rf /var/lib/mysql
        rm -rf /usr/bin/mysql
        rm -rf /usr/lib64/mysql
        rm -rf /usr/share/mysql
    rm -rf /usr/include/mysql
    rm -rf  /var/log/mysqld.log
        if [ $? -eq 0 ]
        then
             echo "卸载成功"
        else
             echo $? 
             exit
        fi

}
while true
do
menu
choice
case $select in
1)
      install_mysql
      ;;
2)
      change_password
      ;;
3)
      configure_mysql
      ;;
4)
      remove_mysql
      ;;
5)
      quit;break
      ;;
esac
done