一、查看内核版本命令：
(1)[root@localhost ~]#cat/proc/version
Linux version 2.6.18-238.el5 (mockbuild@x86-012.build.bos.redhat.com)(gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Sun Dec 19 14:22:44 EST2010
(2)[root@localhost~]# uname -r
2.6.18-238.el5
(3)[root@localhost~]# uname -a
Linux SOR_SYS.99bill.com 2.6.18-238.el5 #1 SMP Sun Dec 19 14:22:44 EST2010 x86_64 x86_64 x86_64 GNU/Linux
二、查看linux版本：
1) 登录到服务器执行 lsb_release -a ,即可列出所有版本信息,例如:
[root@localhost~]# lsb_release -a
LSB version:core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: RedHatEnterpriseAS
Description: Red HatEnterprise Linux AS release 4 (Nahant Update 4)
Release: 4
Codename: NahantUpdate4
注:这个命令适用于所有的linux，包括Redhat、SuSE、Debian等发行版。
2) 登录到linux执行cat /etc/issue,例如如下:
[root@localhost~]# cat /etc/issue
Red Hat Enterprise Linux Server release 5.6 (Tikanga)
Kernel
on an m
3) 登录到linux执行cat/etc/redhat-release ,例如如下:
[root@localhost~]#cat /etc/redhat-release
Red Hat Enterprise Linux AS release 4 (Nahant Update 4)
注:这种方式下可以直接看到具体的版本号，比如 AS4 Update 1
4)登录到linux执行rpm -qredhat-release ,例如如下:
[root@localhost~]# rpm -q redhat-release
redhat-release-5Server-5.6.0.3
注:这种方式下可看到一个所谓的release号，比如上边的例子是5
这个release号和实际的版本之间存在一定的对应关系，如下：
redhat-release-3AS-1 ->Redhat Enterprise Linux AS 3
redhat-release-3AS-7.4 ->Redhat Enterprise Linux AS 3 Update 4
redhat-release-4AS-2 ->Redhat Enterprise Linux AS 4
redhat-release-4AS-2.4 ->Redhat Enterprise Linux AS 4 Update 1
redhat-release-4AS-3 ->Redhat Enterprise Linux AS 4 Update 2
redhat-release-4AS-4.1 ->Redhat Enterprise Linux AS 4 Update 3
redhat-release-4AS-5.5 ->Redhat Enterprise Linux AS 4 Update 4
另:第3)、4)两种方法只对Redhat Linux有效
5) [root@localhost~]#file /bin/bash
/bin/bash: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), forGNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9,stripped
6) [root@localhost~]#file /bin/cat
/bin/cat: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), forGNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9,stripped