本文转自：http://www.linuxidc.com/Linux/2016-05/131749.htm
一、查看Linux内核版本命令（两种方法）：
1、cat /proc/version
[[email protected]CentOS home]# cat /proc/version
Linux version 2.6.32-431.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Fri Nov 22 03:15:09 UTC 2013
2、uname -a
[[email protected] home]# uname -a
Linux S-CentOS 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 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：
[[email protected] ~]# lsb_release -a
LSB Version: :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description: CentOS release 6.5 (Final)
Release: 6.5
Codename: Final
这个命令适用于所有的Linux发行版，包括RedHat、SUSE、Debian…等发行版。
2、cat /etc/redhat-release，这种方法只适合Redhat系的Linux：
[[email protected] home]# cat /etc/redhat-release
CentOS release 6.5 (Final)
3、cat /etc/issue，此命令也适用于所有的Linux发行版。
[[email protected] home]# cat /etc/issue
CentOS release 6.5 (Final)
Kernel \r on an \m