---------------
1) /etc/redhat-release

[root@zfjd-u ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 4 (Tikanga)
#Red Hat Enterprise Linux Server release 5.6 (Tikanga)

2) lsb_release -a    --from /etc/redhat-release

[root@zfjd-u ~]# lsb_release -a
LSB Version:    :core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: RedHatEnterpriseServer
Description:    Red Hat Enterprise Linux Server release 4 (Tikanga)
Release:        4
Codename:       Tikanga
----------------

3) rpm -qa redhat-release --true release

[root@zfjd-u ~]# rpm -qa redhat-release
redhat-release-5Server-5.6.0.3

4) /proc/version --from 3

[root@zfjd-u ~]# cat /proc/version
Linux version 2.6.18-238.el5 (mockbuild@x86-012.build.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Sun Dec 19 14:22:44 EST 2010

5) uname -a    --from 3

[root@zfjd-u ~]# uname -a
Linux zfjd-u 2.6.18-238.el5 #1 SMP Sun Dec 19 14:22:44 EST 2010 x86_64 x86_64 x86_64 GNU/Linux

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