yum is installed on RHEL 5 and above - so if thats not what you're using ie RHEL 4, I guess you're stuck with 'up2date'
I did find this on SO - ymmv ...
Quote:
You can get the rpm package here, http://dl.fedoraproject.org/pub/epel...oview/yum.html. Just download it and install using rpm -ivh command. don't expect, yum will download the packages from RHN. to sync with rhn you still have to use up2date.
Actually that link no longer exists, you nay have to manually search Fedora for it