he is probably owner of one of those cheap virtuozzo based virtual dedicated servers. their default templates do not include yum to prevent high load of yum usage on the host systems. cheers juergen John R. Dennison wrote > On Thu, Oct 15, 2009 at 09:11:07AM +0100, hadi motamedi wrote: >> Thank you very much for your reply . But this time it returns "yum command >> not found" . Can you please help me ? > > Might I direct you to the following sites: > > http://wiki.centos.org/TipsAndTricks > http://wiki.centos.org/HowTos > http://wiki.centos.org/FAQ > http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ > > You also want to read, all the way through, the information > presented by running the follow command from a shell: > > "man yum" > > After you go through the above material you will find many > of your questions answered. > > > > > > John > > > > ------------------------------------------------------------------------ > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos