如何查看已安装的版本信息：

1)[root@localhost ~]# cat /proc/version

Linux version 2.6.18-194.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 ( 4.1.2-48)) #1 SMP Fri Apr 2 14:58:14 EDT 2010

2)

[root@localhost ~]# uname -a

Linux localhost.localdomain 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

3)

[root@localhost ~]# uname -r

2.6.18-194.el5

2. 查看linux版本：

1) 列出所有版本信息,

[root@localhost ~]# 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: CentOS

Description:    CentOS release 5.5 (Final)

Release:        5.5

Codename:      Final

注:这个命令适用于所有的linux，包括、、Debian等发行版。

2) 执行cat /etc/issue,例如如下:

[root@localhost ~]# cat /etc/issue

CentOS release 5.5 (Final)

Kernel r on an m

3) 执行cat /etc/redhat-release ,例如如下:

[root@localhost ~]# cat /etc/redhat-release

CentOS release 5.5 (Final)