How to know CentOS version?

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http://unix.stackexchange.com – How to know version of a CentOS server without access to any graphical interface? I've tried several commands: # cat /proc/version Linux version 2.6.18-128.el5 ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)) #1 SMP Wed Dec 17 11:41:38 EST 2008 # cat /etc/issue Red Hat Enterprise Linux Server release 5.3 (Tikanga) but which one is correct: 4.1.2-4 from /proc/version or 5.3 from /etc/issue? (HowTos)