Unix is a family of operating systems that started in the early 1970s at AT&T Bell Labs. It introduced many ideas that still define modern computing: simple tools, clear design, text‑based configuration, pipes, permissions, and a stable multi‑user environment. Over time, Unix evolved into several branches, including System V, BSD, and many commercial variants used in servers, workstations, and enterprise systems.

This page is the main place for Unix topics. Here you will find short guides, real examples, and notes from working with different Unix systems such as FreeBSD, Solaris, IRIX, HP‑UX, and others. The goal is to explain Unix concepts clearly and practically, without noise, and to show how these systems shaped everything we use today.