mysql5.5 下mysqlbinlog 提示找不到日志文件的问题

今天在查看binlog日志时，总提示not found,但文件路径肯定是对的

错误提示如下：

[bzuo@devdb7 ~]$ mysqlbinlog /u01/run/mysqld/mysqld-bin.000022
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
mysqlbinlog: File '/u01/run/mysqld/mysqld-bin.000022' not found (Errcode: 13)
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET ;

经过一番检查，原来是权限不对，

-rw-rw---- 1 mysql mysql 62603 Feb 11 19:59 mysqld-bin.000022
-rw-rw---- 1 mysql mysql 126 Feb 12 15:19 mysqld-bin.000023

sudo之后就正常了。它提示我没有读权限多好，直接整个not found太不厚道了。