Many times you may need to now the operating system information. We will discuss some useful commands. We will focus on commands that work on RedHat/CentOS installations, as these are the most used OSs in the web hosting industry.
1.1. For kernel version information, use uname -a
root@web [~]# uname -a
Linux web.plothost.com 2.6.32-042stab134.8 #1 SMP Fri Dec 7 17:16:09 MSK 2018 x86_64 x86_64 x86_64 GNU/Linux
root@web [~]#
1.2. Another command for kernel information is cat /proc/version
root@web [~]# cat /proc/version
Linux version 2.6.32-042stab134.8 (root@kbuild-rh6-x64.eng.sw.ru) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-18) (GCC) ) #1 SMP Fri Dec 7 17:16:09 MSK 2018
root@web [~]# ^C
2.1. To get the operating system version on RedHat distributions (RedHat, CentOS etc), use cat /etc/redhat-release
root@web [~]# cat /etc/redhat-release
CentOS Linux release 7.7.1908 (Core)
root@web [~]#
2.2. For other Linux distributions, use cat /etc/*-release
root@web [~]# cat /etc/*-release
CentOS Linux release 7.7.1908 (Core)
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
CentOS Linux release 7.7.1908 (Core)
CentOS Linux release 7.7.1908 (Core)
root@web [~]#
2.3. Another command here is lsb_release -a. This command will list some LSB (Linux Standard Base) information.
root@web [~]# lsb_release -a
LSB Version: :core-4.1-amd64:core-4.1-noarch
Distributor ID: CentOS
Description: CentOS Linux release 7.7.1908 (Core)
Release: 7.7.1908
Codename: Core
root@web [~]#
3. Info about the hostname, virtualization type, architecture, kernel can be shown by using hostnamectl command.
root@web [~]# hostnamectl
Static hostname: web.plothost.com
Icon name: computer-container
Chassis: container
Machine ID: 8ae4190274f046cea9ff6079c62ba82f
Boot ID: 1ab0cef548a8424298b26d7247d3440a
Virtualization: openvz
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 2.6.32-042stab134.8
Architecture: x86-64
root@web [~]#