Versioning Scheme
CentOS version numbers have two parts, a major version and a minor version, which correspond to the major version and update set of Red Hat Enterprise Linux that was used to build that version of CentOS. For example, CentOS 4.4 is built from the source packages from Red Hat Enterprise Linux 4 update 4.
Since mid-2006, starting with version 4.4 (formally known as Red Hat Enterprise Linux 4.0 update 4), Red Hat has adopted a versioning convention identical to that of CentOS, e.g., Red Hat Enterprise Linux 4.5.
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