如何检查使用yum历史记录更新了哪些软件包？

好，让我们做一个小实验：在全新安装的CentOS上，当我输入时yum history list，输出为：

[user@machine ~]# yum history list
Loaded plugins: security
ID | Login user               | Date and time    | Action(s)      |  Altered
 -------------------------------------------------------------------------------
 8 | root <root>              | 2017-03-02 09:42 | I, U           |   28   
 7 | root <root>              | 2017-03-02 09:41 | I, U           |    8   
 6 | root <root>              | 2016-01-30 10:48 | Update         |   10   
 5 | root <root>              | 2015-09-26 16:35 | Update         |    1  <
 4 | System <unset>           | 2015-07-14 21:28 | I, U           |   91 > 
 3 | System <unset>           | 2015-07-14 21:27 | Install        |    1   
 2 | System <unset>           | 2015-07-14 21:27 | Install        |    1   
 1 | System <unset>           | 2015-07-14 21:16 | Install        |  474   
 history list

现在让我们使用来更新vim yum update vim -y，然后yum history list生成以下代码：

 [user@machine ~]# yum history list
 Loaded plugins: security
 ID     | Login user               | Date and time    | Action(s)      | Altered
 ------------------------------------------------------------------------------- 
 9 | root <root>              | 2017-07-28 18:08 | I, U           |    3   
 8 | root <root>              | 2017-03-02 09:42 | I, U           |   28   
 7 | root <root>              | 2017-03-02 09:41 | I, U           |    8   
 6 | root <root>              | 2016-01-30 10:48 | Update         |   10   
 5 | root <root>              | 2015-09-26 16:35 | Update         |    1  <
 4 | System <unset>           | 2015-07-14 21:28 | I, U           |   91 > 
 3 | System <unset>           | 2015-07-14 21:27 | Install        |    1   
 2 | System <unset>           | 2015-07-14 21:27 | Install        |    1   
 1 | System <unset>           | 2015-07-14 21:16 | Install        |  474 

问题是，如果我有兴趣查看更新了哪个软件包，我如何理解此输出？

仅凭该输出，您就无法真正理解它。但是，如果您查看文档，您会发现它yum history info可以为您提供更多实际发生的信息。它接受ID作为参数。