Migrating from RHEL6 to CentOS6...

Why would anyone ever want to do this???

mkdir TMP
yum remove rhnlib abrt-plugin-bugzilla redhat-release-notes*
rpm -e --nodeps redhat-release redhat-indexhtml
cd TMP
wget http://mirror.centos.org/centos/6/os/x86_64/Pack\
ages/centos-release-6-0.el6.centos.5.x86_64.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Pack\
ages/centos-indexhtml-6-1.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Pack\
ages/yum-3.2.27-14.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Pack\
ages/yum-plugin-fastestmirror-1.1.26-11.el6.noarch.rpm
rpm -Uvh *.rpm
cd ..
rm -rf TMP
yum clean all
yum upgrade