Linux下查看系统信息

1. 如何查看已安装的CentOS版本信息
2. 查看linux版本
3. 查看系统是64位还是32位

如何查看已安装的CentOS版本信息：

1. 查看/proc/version文件
   [root@localhost ~]# cat /proc/version Linux version 2.6.18-194.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Fri Apr 2 14:58:14 EDT 2010
2. uname 命令
   [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

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RedHat、SUSE、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)
   

查看系统是64位还是32位:

1. getconf LONG_BIT or getconf WORD_BIT
[root@localhost ~]# getconf LONG_BIT 64

2. file /bin/ls

   [root@localhost ~]# file /bin/ls
   /bin/ls: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
   

3. lsb_release -a

   [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
   

4. 查看文件的方法。

   vim /ect/issue