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How to Install and Use ???yum-utils??? to Maintain Yum and Boost its Performance.

Regardless of Fedora starting to adopt dnf as the new package manager and default package management library, it will not replace good old yum package manager for good in other spinoff distributions (such as Red Hat Enterprise Linux (RHEL) and CentOS) until it has proven to be as reliable as yum and more solid (according to the Fedora Project wiki, as of November 15, 2015, dnf is still in testable state). Thus, your yum-management skills will serve you well for still quite some time.