centos バージョン確認方法 rpm編

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書き換えていたりすると cat /etc/redhat-release だとわからない

[astel@hoge ~]$ rpm -qif /etc/redhat-release
Name        : centos-release
Version     : 7
Release     : 4.1708.el7.centos
Architecture: x86_64
Install Date: Thu 05 Oct 2017 08:17:34 PM JST
Group       : System Environment/Base
Size        : 37949
License     : GPLv2
Signature   : RSA/SHA256, Thu 31 Aug 2017 01:04:53 AM JST, Key ID 24c6a8a7f4a80eb5
Source RPM  : centos-release-7-4.1708.el7.centos.src.rpm
Build Date  : Thu 31 Aug 2017 12:53:09 AM JST
Build Host  : c1bm.rdu2.centos.org
Relocations : (not relocatable)
Packager    : CentOS BuildSystem <http://bugs.centos.org>
Vendor      : CentOS
Summary     : CentOS Linux release file
Description :
CentOS Linux release files