OSバージョンの確認

Debian

 cat /etc/debian_versioin

Ubuntu

 cat /etc/lsb-release
 
 DISTRIB_ID=Ubuntu
 DISTRIB_RELEASE=16.04
 DISTRIB_CODENAME=xenial
 DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"

Redhat/CentOS

 cat /etc/redhat-release

汎用 LSB

 lsb_release -a