linux-centos查看系统版本

[root@test_all ~]# uname -a
Linux test_all 2.6.32-642.4.2.el6.x86_64 #1 SMP Tue Aug 23 19:58:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@test_all ~]# cat /proc/version
Linux version 2.6.32-642.4.2.el6.x86_64 (mockbuild@worker1.bsys.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-17) (GCC) ) #1 SMP Tue Aug 23 19:58:13 UTC 2016
#### 查看版本信息
[root@test_all ~]# lsb_release -a
LSB Version:	:base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID:	CentOS
Description:	CentOS release 6.8 (Final)
Release:	6.8
Codename:	Final
#### 查看redhat版本信息
[root@test_all ~]# cat /etc/redhat-release
CentOS release 6.8 (Final)
[root@test_all ~]# 
#### 查看linux所有发行版
[root@test_all ~]# cat /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m