5 ways to check the system version in CentOs

Method 1

Command:
lsb_release -a

Example:

[root@www ~]# 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 6.7 (Final)
Release:    6.7
Codename:    Final

Method 2

Command:
uname
uname -r
uname -a //The most comprehensive
(applicable to all linux, including Redhat, SuSE, Debian, Centos, etc.)

Example:

[root@www ~]# uname
Linux
[root@www ~]# uname -r
2.6.32-431.23.3.el6.x86_64
[root@www ~]# uname -a
Linux www 2.6.32-431.23.3.el6.x86_64 #1 SMP Thu Jul 31 17:20:51 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Method 3

Command:
cat /etc/redhat-release
(Applicable to RedHat, CentOS)

Example:

[root@www ~]# cat /etc/redhat-release
CentOS release 6.7 (Final)

Method 4

Command:
rpm -q redhat-release
rpm -q centos-release
(Applicable to RedHat, CentOS)

Example: (I did not install redhat, I installed CentOs)

[root@www ~]# cat /etc/redhat-release
package redhat-release is not installed
[root@www ~]# rpm -q centos-release
centos-release-6-7.el6.centos.12.3.x86_64

Method 5

Command:
cat /proc/version
(command between the current centos version and the version corresponding to redhat)

Example:

[root@www ~]# cat /proc/version
Linux version 2.6.32-431.23.3.el6.x86_64 (mockbuild@c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Thu Jul 31 17:20:51 UTC 2014