查看centos版本号

[root@vultr ~]# cat /proc/version
Linux version 2.6.32-573.3.1.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-16) (GCC) ) #1 SMP Thu Aug 13 22:55:16 UTC 2015
[root@vultr ~]# rpm -q centos-release
centos-release-6-7.el6.centos.12.3.x86_64
[root@vultr ~]# cat /etc/redhat-release
CentOS release 6.7 (Final)
[root@vultr ~]# uname -a
Linux vultr.guest 2.6.32-573.3.1.el6.x86_64 #1 SMP Thu Aug 13 22:55:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux