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====== OEL/Red Hat OS version ======



RedHat (RHEL) provides the file /etc/redhat-release, installed by the package redhat-release. Oracle Linux (OL) adds its own file /etc/enterprise-release, installed by enterprise-release, OL 6 adds /etc/oracle-release, installed by oraclelinux-release. As of OL 6, /etc/redhat-release retains the RHEL content.

in RHEL:
<code bash>
my-rhel-server# rpm -qf /etc/redhat-release 
redhat-release-server-6Server-6.0.0.37
</code>

in OEL:
<code bash>
my-oel-server# rpm -qf /etc/redhat-release
enterprise-release-5-0.0.2
</code>
The PDFs from the link above gives a more detailed and precise information.

Some other methods are easily found just google-ing a bit, and may be prone to cause confusion. For instance, it's also possible to check /proc/version, although this one won't make it clear:

<code bash>
# cat /proc/version 
Linux version 2.6.18-274.7.1.0.1.el5 (...) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-51))
</code>

A bit more reliable seems to be /etc/issue or /etc/issue.net: 

<code bash>
# cat /etc/issue.net | head -1
Oracle Linux Server release 5.7
</code>

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