Slackware Linux

 Slackware 

Slackware is a Linux Distribution created by Patrick Volkerding  in 1993.

It is one of the oldest linux distribution and the dcurent verion is 14.2.

Originally based on Softlanding Linux System (SLS), Slackware has been the basis for many other Linux distributions, most notably the first versions of  Suse linux distributions and is the oldest distribution that is still maintained.
Slackware aims for design stability and simplicity and to be the most "Unix-like Linux distribution" .

It makes as few modifications as possible to software packages from upstream and tries not to anticipate use cases or preclude user decisions. 

In contrast to most modern Linux distributions, Slackware provides no graphical installation procedure and no automatic dependency resolution of software packages. 

It uses plain text files and only a small set of shell scrips for configuration and administration. 

Without further modification it boots into acommnd-line interface environment. 

Because of its many conservative and simplistic features, Slackware is often considered to be most suitable for advanced and technically inclined Linux users.

I have never used it.