Different UNIX-like operating systems store information about their release versions differently. If you know what OS you have, but not sure about the version, then here’s how you can find out:
RedHat Linux
bash-3.1$ cat /etc/redhat-release
Red Hat Enterprise Linux Client release 5 (Tikanga)
Ubuntu Linux
bash-3.1$ cat /etc/issue
Ubuntu 6.10 n l
SUSE Linux
~> cat /etc/SuSE-release
SUSE Linux Enterprise Desktop 10 (x86_64)
VERSION = 10
Sun Solaris
bash-2.03$ cat /etc/release
Solaris 8 2/04 s28s_hw4wos_05a SPARC Copyright 2004 Sun Microsystems, Inc.
All Rights Reserved. Assembled 08 January 2004
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