Linux views a summary of the methods for the system version

1. View the Linux system distribution

Command 1: lsb_release -a

This command applies to all Linux systems and displays the full version information, including the name of the Linux system, Debian, Ubuntu, CentOS, and the corresponding version number, as well as the code name for that version, for example, jessie will be displayed in Debian 8.

$ lsb_release -a
No LSB modules are available. 
Distributor ID: Debian 
Description:  Debian GNU/Linux 8.0 (jessie) 
Release:    8.0 
Codename:    jessie 

Command 2: cat /etc/issue

This command applies to all Linux systems, and the version information displayed is brief, with only the system name and the corresponding version number.

$ cat /etc/issue
Debian GNU/Linux 8 \n \1 

Command 3: cat /etc/redhat-release

This command applies only to the Redhat series Linux system, and the version information displayed is brief.

$ cat /etc/redhat-release
CentOS release 6.0 (Final) 

2. View the Linux kernel version

Command 1: uname -a

$ uname -a
Linux CodeBelief 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-3~deb8ul (2015-04-24) x86_64 GNU/Linux 

Command 2: cat /proc/version

$ cat /proc/version
Linux version 3.16.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.7-ckt9-3~deb8ul (2.15-04-24) 

The above is used to query Linux system version of the common command, I hope to help you.