uname -a ; rpm -q yum centos-release ; rpm -V centos-release yum ; ls /etc/yum.repos.d/
Linux tel.iswan.net 2.6.9-34.0.1.EL #1 Wed May 24 07:40:56 CDT 2006 i686 athlon i386 GNU/Linux
yum-2.4.2-2.centos4
centos-release-4-3.2
CentOS-Base.repo  dag.repo