Jegadeesh Kumar <jegasmile at yahoo.com> writes: > how to upgrade CentOS 6.6 from 6.2 I apologize if I'm doing you a disservice, but the fact that you're asking this makes me think you're not familiar with CentOS (or perhaps even Linux generally). Upgrading packages is fairly basic system functionality. You may want to spend some time reading documentation before you do anything else. A good deal of information is accessible on a CentOS system itself using the "man" and "info" commands. Additional documentation is available at http://wiki.centos.org/Documentation The answer to your specific question is found in the manual page for yum ("man yum" at a command line prompt), but yum can do a lot of things. Probably what you want is: # yum upgrade But depending on your needs and the packages installed on your machine, you may need a different yum command.