centos 버전 확인
$ cat /etc/redhat-release
output : CentOS Linux release 7.4.1708 (Core)
어떤 centos 버전이 설치되어 있는지 아는 방법
<p>On the GUI (Gnome) upper right corner click on settings and then on details </p>
By command line
cat /etc/centos-release
This command works also changing the word centos by os (os-release)