[root@localhost ~]# yum -d 5 update kernel
Yum Version: 2.4.3
COMMAND: yum -d 5
Installroot: /
Ext Commands:
   kernel
Setting up Update Process
Setting up repositories
Baseurl(s) for repo: ['http://mirror.tini4u.net/centos/4.4/updates/i386/', 'http                                              ://mirror.secuidc.com/centos/4.4/updates/i386/', 'http://ftp.iij.ad.jp/pub/linux                                              /centos/4.4/updates/i386/', 'http://ftp.yz.yamagata-u.ac.jp/pub/linux/centos/4.4                                              /updates/i386/', 'http://ftp.riken.jp/Linux/centos/4.4/updates/i386/', 'http://f                                              tp.nara.wide.ad.jp/pub/Linux/centos/4.4/updates/i386/', 'http://rsync.atworks.co                                              .jp/centos/4.4/updates/i386/', 'http://ftp.hostrino.com/pub/centos/4.4/updates/i                                              386/', 'http://centos.hostlink.com.hk/4.4/updates/i386/', 'http://mirror.be10.co                                              m/centos/4.4/updates/i386/']
Baseurl(s) for repo: ['http://mirror.tini4u.net/centos/4.4/os/i386/', 'http://mi                                              rror.secuidc.com/centos/4.4/os/i386/', 'http://ftp.nara.wide.ad.jp/pub/Linux/cen                                              tos/4.4/os/i386/', 'http://ftp.iij.ad.jp/pub/linux/centos/4.4/os/i386/', 'http:/                                              /ftp.yz.yamagata-u.ac.jp/pub/linux/centos/4.4/os/i386/', 'http://rsync.atworks.c                                              o.jp/centos/4.4/os/i386/', 'http://ftp.riken.jp/Linux/centos/4.4/os/i386/', 'htt                                              p://centos.hostlink.com.hk/4.4/os/i386/', 'http://ftp.hostrino.com/pub/centos/4.                                              4/os/i386/', 'http://mirror.be10.com/centos/4.4/os/i386/']
Baseurl(s) for repo: ['http://mirror.secuidc.com/centos/4.4/addons/i386/', 'http                                              ://mirror.tini4u.net/centos/4.4/addons/i386/', 'http://ftp.iij.ad.jp/pub/linux/c                                              entos/4.4/addons/i386/', 'http://rsync.atworks.co.jp/centos/4.4/addons/i386/', '                                              http://ftp.yz.yamagata-u.ac.jp/pub/linux/centos/4.4/addons/i386/', 'http://ftp.r                                              iken.jp/Linux/centos/4.4/addons/i386/', 'http://ftp.nara.wide.ad.jp/pub/Linux/ce                                              ntos/4.4/addons/i386/', 'http://centos.hostlink.com.hk/4.4/addons/i386/', 'http:                                              //mirror.be10.com/centos/4.4/addons/i386/', 'http://ftp.hostrino.com/pub/centos/                                              4.4/addons/i386/']
Baseurl(s) for repo: ['http://mirror.tini4u.net/centos/4.4/extras/i386/', 'http:                                              //mirror.secuidc.com/centos/4.4/extras/i386/', 'http://ftp.iij.ad.jp/pub/linux/c                                              entos/4.4/extras/i386/', 'http://ftp.yz.yamagata-u.ac.jp/pub/linux/centos/4.4/ex                                              tras/i386/', 'http://rsync.atworks.co.jp/centos/4.4/extras/i386/', 'http://ftp.r                                              iken.jp/Linux/centos/4.4/extras/i386/', 'http://ftp.nara.wide.ad.jp/pub/Linux/ce                                              ntos/4.4/extras/i386/', 'http://ftp.hostrino.com/pub/centos/4.4/extras/i386/', '                                              http://centos.hostlink.com.hk/4.4/extras/i386/', 'http://mirror.be10.com/centos/                                              4.4/extras/i386/']
Reading repository metadata in from local files
Setting up Package Sacks
Excluding Incompatible Archs
Finished
Reading Local RPMDB
Building updates object
Could not find update match for kernel
No Packages marked for Update/Obsoletion
[root@localhost ~]#