如何查看Linux操作系统版本?
1. 查看内核版本命令:

$ cat /proc/version
Linux version 2.6.32-358.el6.x86_64 (mockbuild@c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #1 SMP Fri Feb 22 00:31:26 UTC 2013
$ uname -a
Linux 192.168.1.10 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22 00:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
$ uname -r
2.6.32-358.el6.x86_64

2. 查看Linux版本:
1) 执行 lsb_release -a ,即可列出所有版本信息,例如:

$ lsb_release -a
LSB Version:    core-2.0-noarch:core-3.0-noarch:core-2.0-ia32:core-3.0-ia32:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.0-ia32:graphics-3.0-noarch
Distributor ID: SUSE LINUX
Description:    SUSE LINUX Enterprise Server 9 (i586)
Release:        9
Codename:       n/a

注:这个命令适用于所有的linux,包括Redhat、SuSE、Debian等发行版。
2) 执行cat /etc/issue,例如如下:

$ cat /etc/issue
Welcome to SUSE LINUX Enterprise Server 9 (i586) - Kernel \r (\l).

3) 执行cat /etc/redhat-release ,例如如下:

$ cat /etc/*release*
CentOS release 6.4 (Final)
CentOS release 6.4 (Final)
CentOS release 6.4 (Final)
cpe:/o:centos:linux:6:GA