grep去除注释获取有用配置

linux强大的grep从配置文件中取出起作用的内容：

ghostwu@dev:~/linux/grep$ cat -n ghostwu.php

<?php
   
       class Person {
   
           #人名
           public $name = 'ghostwu';
   
           #年龄
           public $age = 20;
   
           #显示信息　
           public function showinfo(){
               echo $this->name . PHP_EOL;
               echo $this->age. PHP_EOL;
           }
       }

ghostwu@dev:~/linux/grep$ grep -Ev “^$|#” ghostwu.php

<?php
    class Person {
        public $name = 'ghostwu';
        public $age = 20;
        public function showinfo(){
            echo $this->name . PHP_EOL;
            echo $this->age. PHP_EOL;
        }
    }

​