Linux comes with many flavors in the form of distributions, with some of the more popular distributions being Ubuntu, Fedora, and openSUSE.
Things are different enough between each distribution that some commands and methods could work differently between them. It is also sometimes true for a different version of the same distribution.
Therefore, you need to know the distribution name and version of the Linux system you're administering. It is especially true if you're accessing remote machines via SSH, which doesn't have the GUI to guess the distribution name and version quickly.
You can check the Linux distribution name, version, and other details from the command line. Some of these methods are not standardized, so you might need to try what works for your system.
$ cat /etc/centos-release CentOS Linux release 8.3.2011
$ cat /etc/system-release CentOS Linux release 8.3.2011
The file is normally just a symbolic link to /etc/<distribution>-release file.
$ ls -l /etc/system-release lrwxrwxrwx. 1 root root 14 Nov 10 10:49 /etc/system-release -> centos-release
$ cat /etc/os-release NAME="CentOS Linux" VERSION="8" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="8" PLATFORM_ID="platform:el8" PRETTY_NAME="CentOS Linux 8" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:8" HOME_URL="https://centos.org/" BUG_REPORT_URL="https://bugs.centos.org/" CENTOS_MANTISBT_PROJECT="CentOS-8" CENTOS_MANTISBT_PROJECT_VERSION="8"
$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=20.10 DISTRIB_CODENAME=groovy DISTRIB_DESCRIPTION="Ubuntu 20.10"
$ hostnamectl Static hostname: host Icon name: computer-vm Chassis: vm Machine ID: 38fcf097cda64808aef7af32f0834151 Boot ID: 1b67469d661444dca2bf8b55d2b82028 Virtualization: vmware Operating System: Ubuntu 20.10 Kernel: Linux 5.8.0-34-generic Architecture: x86-64
$ uname -a Linux host 5.8.0-34-generic #37-Ubuntu SMP Thu Dec 10 18:01:14 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Some information can be inferred such as kernel version 5.8 for this system is what Ubuntu 20.10 ships with.
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