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How to find Release version of different Unix OS

RedHat Linux
# cat /etc/redhat-release
Red Hat Enterprise Linux ES release 4 ( Nahant Update 8 )

SUSE Linux
# cat /etc/SuSE-release
SUSE Linux Enterprise Desktop 10 (x86_64)
VERSION = 10

Sun Solaris
# cat /etc/release
Solaris 10 6/06 s10s_u2wos_09a SPARC
Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
Use is subject to license terms.
Assembled 09 June 2006

Ubuntu Linux
# cat /etc/issue
Ubuntu 6.10 n l

HP UX
# uname -r
B.11.23

AIX
# oslevel
5.3.0.0
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