获取Linux版本信息

　　//很多时候这是很必要的

1) lsb_release -a ，即可列出所有版本信息，适用于所有的linux，例如：
ox0spy@ubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 6.06.1 LTS
Release: 6.06
Codename: dapper
ox0spy@ubuntu:~$

2) cat /etc/redhat-release ，

这种方式下可以直接看到具体的版本号，比如 AS4 Update 1

3)rpm -q redhat-release ，

　这种方式下可看到一个所谓的release号，比如上边的例子是2.4

　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

4) cat /etc/issue
Fedora Core release 4 (Stentz)
Kernel r on an m

5) 内核版本，cat /proc/version,例如：
ox0spy@ubuntu:~$ cat /proc/version
Linux version 2.6.15-26-server (buildd@terranova) (gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) #1 SMP Thu Aug 3 04:09:15 UTC 2006

注意：第(2)(3)两种方法只对Redhat Linux有效