centos檢視版本號，最合適的命令為：
cat /etc/redhat-release
以下為測試過程：
1. cat /etc/redhat-release
[root@localhost ~]# cat /etc/redhat-release
centos linux release 7.2.1511 (core)
2. lsb_release
命令沒找到
3. uname -a
[root@localhost ~]# uname -a
linux localhost.localdomain3.10.0-327.el7.x86_64 #1 smp thu nov 19 22:10:57 utc 2015 x86_64 x86_64 x86_64gnu/linux
4. cat /proc/version
[root@localhost ~]# cat /proc/version
linux version 3.10.0-327.el7.x86_64([email protected]) (gcc version 4.8.3 20140911 (red hat 4.8.3-9)(gcc) ) #1 smp thu nov 19 22:10:57 utc 2015
參考：如何檢視已安裝的centos版本資訊：
1)[root@localhost ~]# cat /proc/version
linux version 2.6.18-194.el5 ([email protected]) (gcc version 4.1.2 20080704 (red hat 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. 檢視linux版本：
1) 列出所有版本資訊,
[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:這個命令適用於所有的linux，包括redhat、suse、debian等發行版。
2) 執行cat /etc/issue,例如如下:
[root@localhost ~]# cat /etc/issue
centos release 5.5 (final)
kernel r on an m
3) 執行cat /etc/redhat-release ,例如如下:
[root@localhost ~]# cat /etc/redhat-release
centos release 5.5 (final)
檢視系統是64位還是32位:
1、getconf long_bit or getconf word_bit
[root@localhost ~]# getconf long_bit
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、或者是使用檢視檔案的方法。
vim /ect/issue
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