上面是一个config文件的内容，我想用shell脚本提取变量

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<?php
if (!defined('IN_CONTEXT')) die('access violation error!');
class Config {
public static $mysql_ext = 'mysql';
public static $db_host = 'localhost';
public static $db_user = 'abc';
public static $db_pass = 'st';
public static $db_name = 'abc_123';
public static $port = '3306';
public static $mysqli_charset = 'utf8';
public static $tbl_prefix = 'bb32_';
public static $cookie_prefix = '28vDzA_';
public static $enable_db_debug = false;
}?>


上面是一个config文件的内容，我想用shell脚本提取变量

$db_name = 'abc_123';
$tbl_prefix = 'bb32_';

想提取的内容abc_123 ,  bb32_

还请大师指点。