You can use different commands to check the Linux OS version. Follow the below steps to check the installed OS version on CentOS / Redhat servers.
 
 

How to check OS version on CentOS, Redhat and Fedora servers

 
1. Log into your CentOS, Redhat or Fedora server via SSH as ‘root’ user or as sudo user

2. Run any of the below commands to check the OS version of your CentOS Redhat server
 

Command 1 : cat /etc/redhat-release

 

 

Command 2 :cat /etc/os-release

 

 

Command 3 : cat /etc/centos-release

 

 

Command 4 :lsb_release -a

 

 
3. If package ‘redhat-lsb-core’ is installed, you can use the command ‘lsb_release -a’ to check the OS version
 
 

How to check OS version on Debian and Ubuntu servers

 
1. Log into your Debian or Ubuntu server via SSH as ‘root’ user or as sudo user

2. Run any of the below commands to check the OS version
 

Command 1 : cat /etc/lsb-release

 

 

Command 2 : cat /etc/os-release

 

 

Command 3 : cat /etc/issue

 

 

Command 4 : lsb_release -a

 

 
Command 5 : cat /etc/issue.net
 

 
 

How to check Linux kernel Version

 
1. Open the terminal

2. Log into your Linux server via SSH as ‘root’ user or as sudo user

3. Run the command ‘uname -r’ to check the Kernel release