What version of RHEL am I using?

You can use the lsb_release command on various Linux distributions:

lsb_release -i -r

This will tell you the Distribution and Version and is a little bit more accurate than accessing files that may or may not have been modified by the admin or a software package. As well as working across multiple distros.

For RHEL, you should use:

cat /etc/redhat-release

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