How to find exact version of Red Hat Linux

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[root@localhost ]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.2 (Tikanga)


For others:

Slackware: /etc/slackware-version
Mandrake: /etc/mandrake-release
Red Hat: /etc/redhat-release
Fedora: /etc/fedora-release

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