[root@localhost ~]# cat /etc/os-release 

NAME="CentOS Linux"

VERSION="7 (Core)"

[root@localhost ~]# cat /etc/redhat-release 

CentOS Linux release 7.1.1503 (Core) 

[root@localhost ~]# 

[root@localhost ~]# rpm -q centos-release

centos-release-7-1.1503.el7.centos.2.8.x86_64

[root@localhost ~]# 

[root@localhost ~]# uname -a

Linux localhost.localdomain 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

[root@localhost ~]# 

[root@localhost ~]# cat /proc/version

Linux version 3.10.0-229.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.2 20140120 (Red Hat 4.8.2-16) (GCC) ) #1 SMP Fri Mar 6 11:36:42 UTC 2015

[root@localhost ~]#

[root@localhost ~]# cat /etc/issue

\S

Kernel \r on an \m

[root@localhost ~]# 

[root@localhost ~]# file /bin/ls

/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=0xec333a104e045327c5e3d0ca6dda16c610a210f3, stripped

[root@localhost ~]# 

// LSB --- Linux Standard Base

[root@localhost yum.repos.d]# lsb_release -a

LSB Version::core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch

Distributor ID:CentOS

Description:CentOS Linux release 7.1.1503 (Core) 

Release:7.1.1503

Codename:Core

[root@localhost yum.repos.d]#