How to check CentOS version

In order to check current version of CentOS, try the following.

>  cat /etc/*release*

You will see the version similar to the following.

CentOS release 6.4 (Final)
LSB_VERSION=base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
cat: /etc/lsb-release.d: Is a directory
CentOS release 6.4 (Final)
CentOS release 6.4 (Final)
cpe:/o:centos:linux:6:GA

Or more specifically...

> cat /etc/centos-release

This will show just the version number as follows.

CentOS release 6.4 (Final)