[root@localhost ~]# yum update kernel
Setting up Update Process
Setting up repositories
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-2.6.9-34.EL.i686.r 100% |=========================| 175 kB    00:01
---> Package kernel.i686 0:2.6.9-34.EL set to be installed
--> Running transaction check

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 kernel                  i686       2.6.9-34.EL      update             10 M

Transaction Summary
=============================================================================
Install      1 Package(s)
Update       0 Package(s)
Remove       0 Package(s)
Total download size: 10 M
Is this ok [y/N]: y
Downloading Packages:
(1/1): kernel-2.6.9-34.EL 100% |=========================|  10 MB    00:57
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing: kernel                       ######################### [1/1]

Installed: kernel.i686 0:2.6.9-34.EL
Complete!