How to check Unix version using command line

To check the version of a Unix-like operating system from the command line, you can use the uname command with the -a option. This will display information about the operating system, including the version.

For example:

uname -a

This will display output similar to the following:

Linux example.com 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

The version information is typically displayed as part of the kernel release number (e.g., 4.15.0-112-generic in the example above).

You can also use the lsb_release command to display more detailed version information:

lsb_release -a

This will display output similar to the following:

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.5 LTS
Release:        18.04
Codename:       bionic

For more information on the uname and lsb_release commands, you can refer to the documentation or use the man command to view the manual pages.