gistfile1.aw

<?php

    class System
    {

        public static function run()
        {
            $args = func_get_args();

            if (!empty($args)) {
                $command = escapeshellcmd(array_shift($args));
                $length = count($args);
                
                for($i=0;$i<$length;++$i){
                    $args[$i] = escapeshellarg(preg_replace('/[^a-z0-9.\-\/]+/i', null, $args[$i]));
                }

                var_dump($args);
                
                $r = null;
                exec($command . ' ' . implode(' ', $args), $r);

                return $r;
            }
            
            throw new SystemException('System command was not well formatted');
        }
    }
    
    class SystemException extends Exception
    {
        
    }