private static function findLsof()
    {
        $finder = new ExecutableFinder();
        $lsofPath = $finder->find('lsof', null, ['/sbin', '/usr/sbin']);
        if ($lsofPath === null) {
            throw new Exception\RuntimeException('Unable to find the "lsof" executable.');
        }

        return $lsofPath;
    }
private static function findLsof()
    {
        $finder = new ExecutableFinder();
        $lsofPath = $finder->find('lsof', null, ['/sbin', '/usr/sbin']);
        if ($lsofPath === null) {
            throw new Exception\RuntimeException('Unable to find the "lsof" executable.');
        }

        return $lsofPath;
    }
@throws Exception\RuntimeException

@return string