Red Hat Enterprise Linux 4 is a Linux distribution sold by Red Hat, Inc. for the enterprise market. It is used for both servers and desktops. Although the binaries are not freely available, the sources are, and so there are numerous projects which provide compatible rebuilds of RHEL, such as CentOS and Scientific Linux.

RHEL 4 was released in 2005, went end of production in 2012 and is currently available on extended life cycle support until 2017.


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