Skip to main content

Chapter 1.3 - History and Evolution

Learning Objectives​

At the end of this chapter, you will be able to:

  • Understand the evolution from Unix to Linux
  • Know the history of Linux
  • Understand the role of Linus Torvalds
  • Identify key steps in the adoption of Linux

Introduction​

To fully understand Linux, it is important to know its history and evolution. Linux did not appear overnight but is the result of decades of evolution in operating systems.

The Evolution from Unix to Linux​

Complete Timeline​

Unix: The Origins (1969-1990)​

Creation of Unix​

1969 - AT&T Bell Labs:

  • Ken Thompson and Dennis Ritchie
  • Creation of Unix for the PDP-7
  • Written in assembly then in C (1973)
  • Philosophy: "Do one thing and do it well"

Characteristics:

  • Multi-user
  • Multi-tasking
  • Hierarchical file system
  • Philosophy of small tools

Evolution and Variants​

1970s-1980s:

  • BSD (Berkeley Software Distribution): University of California
  • System V: Commercial version by AT&T
  • Commercialization: High costs, restrictive licenses

Problem:

  • Unix became expensive and proprietary
  • Difficult access for students
  • Need for a free alternative

GNU Project (1983)​

Richard Stallman and the Free Software Foundation​

1983 - Launch of the GNU Project:

  • Objective: Create a free Unix-like operating system
  • GNU: "GNU's Not Unix" (recursive)
  • Philosophy: Free software (Free Software)

Components created:

  • GCC (compiler)
  • Bash (shell)
  • Coreutils (utilities)
  • But: No kernel (Hurd in development)

Minix (1987)​

Educational System​

Andrew Tanenbaum:

  • Created Minix for teaching
  • Based on Unix
  • Source code available
  • Limitation: Too simple, not for production

Role:

  • Inspired Linus Torvalds
  • Learning base
  • Showed that a Unix-like system was possible

Birth of Linux (1991)​

Linus Torvalds​

Finnish student at the University of Helsinki:

  • Used Minix but frustrated by its limitations
  • Wanted a complete and free system
  • Decided to create his own kernel

The First Post (August 25, 1991)​

From: torvalds@klaava.Helsinki.FI (Linus Benedict Torvalds)
Subject: What would you like to see most in minix?

Hello everybody out there using minix -

I'm doing a (free) operating system (just a hobby, won't be big and
professional like gnu) for 386(486) AT clones...

Key message: "just a hobby, won't be big and professional"

Initial Development​

1991:

  • September 17: Version 0.01 released
  • October 5: Version 0.02
  • December: Version 0.11 (first usable version)

Characteristics:

  • Kernel only (not a complete system)
  • Compatible with Minix
  • Written in C and assembly
  • Initially proprietary license

Adoption of the GPL​

1992:

  • Linus adopts the GPL (GNU General Public License)
  • Linux becomes truly free
  • Compatible with GNU tools
  • GNU/Linux: Complete system

Growth and Distributions (1990s)​

Early Distributions​

1993 - Debian:

  • Ian Murdock
  • Community distribution
  • Stable and reliable
  • Base for many other distributions

1994 - Red Hat:

  • Marc Ewing and Bob Young
  • Commercial distribution
  • Enterprise support
  • Popular in business

1994 - SUSE:

  • German distribution
  • Popular in Europe
  • Enterprise version (SUSE Linux Enterprise)

1993 - Slackware:

  • Patrick Volkerding
  • Oldest active distribution
  • Simple and minimalist

Growth​

1990s:

  • Adoption by developers
  • Use on servers
  • Growing community
  • Continuous improvement

Massive Adoption (2000s)​

Web Servers​

LAMP Stack:

  • Linux
  • Apache
  • MySQL
  • PHP/Python/Perl

Result:

  • Linux becomes standard for web servers
  • 96% of the most important web servers

Ubuntu (2004)​

Mark Shuttleworth:

  • Distribution based on Debian
  • Easy to use
  • Popularization of Linux desktop
  • Commercial support available

Cloud and Mobile (2010s)​

Cloud Computing​

2010s:

  • AWS, Azure, GCP: Majority of Linux instances
  • Cloud-native infrastructure
  • Containers (Docker)
  • Orchestration (Kubernetes)

Mobile​

Android (2005-2008):

  • Based on the Linux kernel
  • 70%+ of the mobile market
  • Billions of devices

Today (2020s)​

Impressive Statistics​

Figures:

  • 100% of the top 500 supercomputers
  • 96% of 1 million web servers
  • 70%+ of the mobile market
  • Millions of IoT devices
  • Standard of cloud computing

Linus Torvalds Today​

Role:

  • Principal maintainer of the Linux kernel
  • Important technical decisions
  • Developer coordination
  • "Benevolent Dictator for Life"

Philosophy:

  • "Talk is cheap. Show me the code."
  • Technical pragmatism
  • Code quality

Summary​

In this chapter, you learned:

Unix (1969): Origins, AT&T Bell Labs
GNU (1983): Free software, system tools
Minix (1987): Educational system, inspiration
Linux (1991): Linus Torvalds, free kernel
Distributions (1990s): Debian, Red Hat, SUSE
Adoption (2000s): Web servers, Ubuntu
Cloud/Mobile (2010s): AWS, Android
Today (2020s): Everywhere, industry standard

Next Steps​

Chapter 1.4: High-Level Architecture
Chapter 1.5: Fundamental Concepts

Chapter created on: December 2024