How to Upgrade from CentOS 5.x to CentOS 5.9

CentOS is an community-supported open source operating system that based on Red Hat. The CentOS 5.9 release is based on the upstream release of EL (Enterprise Linux) 5.9 and comes with all the packages including Server and Client. This release is the ninth update in the CentOS 5.x series and comes with lots of updates, bug fixes and added new functionality.

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