CentOS system uses commands to query version information

First, the query system version information

①[[email protected] ~]# cat/etc/issue

CentOS Release 6.6 (Final)

Kernel \ r on an \m

②[[email protected] ~]# Rpm-qa | grep centos-release
Centos-release-6-6.el6.centos.12.2.x86_64

③[[email protected] ~]# cat/etc/centos-release
CentOS Release 6.6 (Final)

Second, the query system kernel information
[Email protected] ~]# uname-a
Linux localhost.localdomain 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:35 EDT. i686 i686 i386 Gnu/linux

Third, query the CentOS and redhat version of the corresponding information

[Email protected] ~]# cat/proc/version
Linux version 2.6.32-504.el6.x86_64 ([email protected]) (GCC version 4.4.7 20120313 (Red Hat 4.4.7-11) (gcc)) #1 SMP Wed Oct 04:27:16 UTC 2014

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CentOS system uses commands to query version information