原文出处 http://www.ha97.com/2987.html
1、cat /proc/version
[root@localhost ~]# cat /proc/version
Linux version 2.6.18-194.8.1.el5.centos.plus (mockbuild@builder17.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Wed Jul 7 11:50:45 EDT 2010
2、uname -a
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-194.8.1.el5.centos.plus #1 SMP Wed Jul 7 11:50:45 EDT 2010 i686 i686 i386 GNU/Linux
二、查看Linux系统版本的命令（3种方法）：
1、lsb_release -a，即可列出所有版本信息：
[root@localhost ~]# lsb_release -a
LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: CentOS
Description: CentOS release 5.5 (Final)
Release: 5.5
Codename: Final