Vitux published six ways to get Debian version information.
6 Ways to get Debian version information
We may need to know what version of the Debian operating system we have installed on our computer. It may be useful in a variety of situations, such as when we need to download a software build for a certain version of our current operating system, or when we need to obtain online support or engage with development environments. Whatever the cause, it’s always a good idea to double-check the OS version you’re using.
