[root@localhost beinan]# yum info kernel.i686
[root@localhost beinan]# yum info kernel.i686
Setting up repositories
updates-released 100% |=========================| 951 B 00:00
extras 100% |=========================| 1.1 kB 00:00
base 100% |=========================| 1.1 kB 00:00
freshrpms 100% |=========================| 951 B 00:00
Reading repository metadata in from local files
Installed Packages
Name : kernel
Arch : i686
Version: 2.6.11
Release: 1.1369_FC4
Size : 37 M
Repo : installed
Summary: Linux 内核(Linux 操作系统的核心)。
Description:
kernel 软件包包含 Linux 内核 (vmlinuz)，Red Hat Linux
操作系统的核心。内核处理操作系统的基本功能：
分配内存、处理分配、设备的输入和输出等等。
Available Packages
Name : kernel
Arch : i686
Version: 2.6.12
Release: 1.1398_FC4
Size : 14 M
Repo : updates-released
Summary: The Linux kernel (the core of the Linux operating system)
Description:
The kernel package contains the Linux kernel (vmlinuz), the core of any
Linux operating system. The kernel handles the basic functions
of the operating system: memory allocation, process allocation, device
input and output, etc.
通过上面的信息，我们可以看到 2.6.11的是已经安装了，因为已经显示的是Repo : installed ，下面还有一个Version: 2.6.12 ，告诉我们是Repo : updates-released，看来这个是升级用的了。
所以是否升级就看我们的了。
[root@localhost beinan]# yum update kernel
升级内核全景如下：
[root@localhost beinan]# yum update kernel
Setting up Upgrade Process
Setting up repositories
updates-released 100% |=========================| 951 B 00:00
extras 100% |=========================| 1.1 kB 00:00
base 100% |=========================| 1.1 kB 00:00
freshrpms 100% |=========================| 951 B 00:00
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for kernel to pack into transaction set.
kernel-2.6.12-1.1398_FC4. 100% |=========================| 174 kB 00:18
---> Package kernel.i686 0:2.6.12-1.1398_FC4 set to be installed
--> Running transaction check
Dependencies Resolved
=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
kernel i686 2.6.12-1.1398_FC4 updates-released 14 M
Transaction Summary
=============================================================================
Install 1 Package(s)
Update 0 Package(s)
Remove 0 Package(s)
Total download size: 14 M
Is this ok [y/N]:
是不是升级，只需要在 Is this ok [y/N]:行的后面输入y或者N；y是yes，就是点头同意的意思；N就是摇头No的意思。
对于软件包的查询，还有，比如：
[root@localhost beinan]# yum list available 列出所有升级源上的包；
[root@localhost beinan]# yum list updates 列出所有升级源上的可以更新包；
[root@localhost beinan]# yum list installed 列出已经安装的包；
yum 的命令支持通配符； 比如；
[root@localhost beinan]# yum list mp* |more
Setting up repositories
Reading repository metadata in from local files
Installed Packages
mpage.i386 2.5.4-5 installed
Available Packages
mpc.i386 0.11.2-3 extras
mpeg2dec.i386 0.4.0-5b.2.fc4 freshrpms
mpeg2dec-devel.i386 0.4.0-5b.2.fc4 freshrpms
mpg321.i386 0.2.10-6.2.fc4 freshrpms
mplayer.i386 1.0-0.16.pre7.2.fc4 freshrpms
mplayer-docs.i386 1.0-0.16.pre7.2.fc4 freshrpms
mplayer-fonts.noarch 1.1-3.fc freshrpms
mplayer-skins.noarch 1.7-1.fc freshrpms
[root@localhost beinan]#
2.安装和升级软件包；
安装和升级分别是 install 和 update 参数；比如；
[root@localhost beinan]# yum update firefox
这样我们就可以升级 firefox了。
[root@localhost beinan]# yum update firefox
Setting up Update Process
Setting up repositories
updates-released 100% |=========================| 951 B 00:00
extras 100% |=========================| 1.1 kB 00:00
base 100% |=========================| 1.1 kB 00:03
freshrpms 100% |=========================| 951 B 00:02
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package firefox.i386 0:1.0.6-1.1.fc4 set to be updated
--> Running transaction check
Dependencies Resolved
=============================================================================
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