有几种方式可以看操作系统的版本：
Example:
1. [root@oueedim62 ~]# uname -a
Linux oueedim62.emea.nsn-net.net 2.6.18-128.el5 #1 SMP Wed Dec 17 11:41:38 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
el5 就是Enterprise Linux 5
2. [root@oueedim62 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.3 (Tikanga)
登录到linux执行cat /etc/redhat-release,这种方式下可以直接看到具体的版本号，比如:Red Hat Enterprise Linux Server release 5.1 (Tikanga)
3. [root@oueedim62 ~]# rpm -q redhat-release
redhat-release-5Server-5.3.0.3
4. [root@oueedim62 ~]# cat /proc/version
Linux version 2.6.18-128.el5 (mockbuild@hs20-bc1-7.build.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)) #1 SMP Wed Dec 17 11:41:38 EST 2008
5. [root@oueedim62 ~]# lsb_release -a
LSB Version: :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: RedHatEnterpriseServer
Description: Red Hat Enterprise Linux Server release 5.3 (Tikanga)
Release: 5.3
Codename: Tikanga
登录到服务器执行 lsb_release -a ，即可列出所有版本信息,这个命令适用于所有的linux，包括Redhat、SuSE、Debian等发行版。
6. [root@oueedim62 ~]# cat /etc/issue
Red Hat Enterprise Linux Server release 5.3 (Tikanga)
Kernel \r on an \m
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