今天RAK将给大家详细讲解查看CentOS版本信息的命令。
(一) 查看已经安装的CentOS版本信息
1.cat /etc/issue 查看版本
cat 缩写concatenate cat命令可以用来显示、合并文件。
CentOS release 6.6 (Final)
CentOS 发行版6.6
etc 初期etc的英文名字缩写为etcetera ，后来大家更习惯称为 Editable Text Configuration。ETC为系统配置文件目录，该目录包含系统启动脚本、启动配置文件、用户登陆配置文件、网络配置文件、httpd 配置文件、IPSec 配置文件和其他文件等。
2.cat /etc/redhat-release 查看CentOS版本
3.cat /proc/version
proc 为process的缩写，里面存放与内核相关的文件。
显示结果：
Linux version 2.6.32-504.12.2.el6.x86_64(mockbuild@c6b9.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) ) #1 SMP Wed Mar 11 22:03:14 UTC 2015
我们可以看到该系统使用的是Linux 2.6.32 内核的64为操作系统。GCC 为GUN 编译器集合，采用4.4.5版本。
4.uname -a 显示如下
Linux 主机192-168-14-166
Linux 版本2.6.32-504.12.2.el6.x86_64 64位
5.uname -r
显示结果：2.6.32-504.12.2.el6.x86_64
分析结果：Linux 版本2.6.32-504.12.2.el6.x86_64 64位
（二）查看系统是32位或者64位的方法
1.getconf LONG_BIT or getconf WORD_BIT
输入：getconf LONG_BIT
返回结果：64
输入：getconf WORD_BIT
返回结果：32
分析：32位的系统中int类型和long类型一般都是4字节，64位的系统中int类型还是4字节的，但是long已变成了8字节inux系统中可用”getconf WORD_BIT”和”getconf LONG_BIT”获得word和long的位数。64位系统中应该分别得到32和64。
所以该系统为64为Linux系统。
2.file /bin/ls
/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped
可以看到 ELF 64-bit LSB 所以该系统为64位
此教程来自固定链接：http://www.rakbuluo.com/p47
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