4.1 Choosing an Operating System (Weight: 1)

📘Linux Essentials (LPI 010-160)

Introduction

An Operating System (OS) is system software that manages computer hardware and software resources and provides services for applications. It acts as the interface between the user and the computer hardware.

The three major operating systems used in modern computing are:

Microsoft Windows
macOS
Linux

Each operating system has different design goals, licensing models, system architecture, and typical use cases. Understanding these differences is important for the Linux Essentials (LPI 010-160) exam.

1. Overview of the Three Operating Systems

Windows

Windows is a commercial operating system developed by Microsoft. It is the most widely used desktop operating system in the world.

Key characteristics:

Proprietary software
Graphical user interface (GUI) focused
Large application ecosystem
Strong compatibility with commercial software

Windows is commonly used in:

Office workstations
Enterprise environments
Gaming systems
Software development environments

Common versions include:

Windows 10
Windows 11
Windows Server editions

macOS

macOS is a Unix-based operating system developed by Apple. It is designed specifically for Apple hardware such as Mac computers.

Key characteristics:

Proprietary operating system
Based on Unix architecture
Integrated tightly with Apple hardware
Known for system stability and user interface design

macOS is commonly used in:

Software development
Media production environments
Design and creative industries
Apple ecosystem integration

Linux

Linux is an open-source operating system based on the Linux kernel. It is developed collaboratively by individuals and organizations worldwide.

Linux is typically distributed as Linux distributions (distros) that combine the kernel with system tools and software.

Examples of distributions include:

Ubuntu
Debian
Fedora
Red Hat Enterprise Linux
openSUSE

Linux is widely used in:

Servers
Cloud infrastructure
Embedded systems
Networking equipment
Cybersecurity environments
Supercomputers

2. Licensing and Cost

One major difference between the operating systems is the software licensing model.

Windows Licensing

Windows is proprietary software.

This means:

The source code is not publicly available.
Users must purchase a license to use it.
Modification and redistribution are restricted.

Organizations usually buy Windows licenses for:

Workstations
Enterprise environments
Servers

macOS Licensing

macOS is also proprietary software.

Important points:

Only legally licensed to run on Apple hardware
The source code is mostly closed
Users cannot legally install it on non-Apple computers

Apple controls both the hardware and software ecosystem.

Linux Licensing

Linux is open-source software.

This means:

The source code is publicly available.
Anyone can modify it.
Anyone can redistribute it.

Linux uses licenses such as the GNU General Public License (GPL).

Many Linux distributions are:

Free to download
Free to use
Free to modify

However, commercial support may be available (for example enterprise support subscriptions).

3. System Architecture

The architecture of each operating system differs in terms of system design and development approach.

Windows Architecture

Windows uses a hybrid kernel architecture.

Characteristics include:

Combination of microkernel and monolithic kernel elements
Strong integration with Microsoft technologies
Designed for wide hardware compatibility

Windows includes many integrated system components such as:

Windows Registry
DirectX
PowerShell
Windows Subsystem for Linux (WSL)

macOS Architecture

macOS is based on Unix architecture.

Its core is built on Darwin, which includes:

XNU kernel
BSD components
Mach microkernel features

Because of its Unix foundation:

It supports many Unix commands
It provides strong development tools
It has a stable and secure system design

Linux Architecture

Linux uses a monolithic kernel architecture with modular capabilities.

Key characteristics:

Highly modular kernel
Drivers can be loaded dynamically
Very customizable system design

Linux architecture is divided into layers:

Hardware
Kernel
System libraries
System utilities
Applications
User interface (CLI or GUI)

Because of its modular nature, Linux can run on:

Desktops
Servers
Smartphones
Embedded devices
Supercomputers

4. Hardware Compatibility

Operating systems differ in the hardware they support.

Windows Hardware Support

Windows supports a very wide range of hardware because many vendors create drivers specifically for Windows.

This includes:

Desktop computers
Laptops
Workstations
Specialized enterprise hardware

Hardware manufacturers typically release Windows drivers first.

macOS Hardware Support

macOS supports only Apple hardware.

Advantages of this model:

Highly optimized hardware integration
Stable driver ecosystem
Controlled system performance

Limitations:

Limited hardware customization
Cannot run legally on non-Apple hardware

Linux Hardware Support

Linux supports a very large range of hardware platforms, including:

x86
ARM
PowerPC
RISC-V

Linux runs on:

Servers
Routers
IoT devices
Smartphones
Embedded systems

However, some hardware vendors provide better driver support for Windows than Linux, which can sometimes affect compatibility.

5. Software Installation and Package Management

The way software is installed differs greatly between the systems.

Windows Software Installation

Windows usually installs software through:

Downloaded installation files (.exe or .msi)
Graphical installation wizards
Microsoft Store

Characteristics:

Software packages are usually installed individually
Applications manage their own dependencies
System-wide package management is limited

macOS Software Installation

macOS installs software using:

App Store
DMG packages
PKG installers

Applications are often distributed as:

ApplicationName.app

Users can install programs by copying the application into the Applications folder.

Linux Software Installation

Linux distributions typically use package managers.

Package managers install software from central repositories.

Examples include:

Distribution	Package Manager
Ubuntu / Debian	apt
Fedora	dnf
Red Hat	yum / dnf
Arch Linux	pacman

Example installation command:

sudo apt install nginx

Advantages:

Automatic dependency handling
Secure repositories
Centralized software updates

6. Security Models

Security design differs significantly among the systems.

Windows Security

Windows security features include:

User Account Control (UAC)
Windows Defender
BitLocker disk encryption
Active Directory integration

Because of its large user base, Windows is often a primary target for malware.

macOS Security

macOS security features include:

Gatekeeper
System Integrity Protection (SIP)
FileVault encryption
Application sandboxing

Because macOS is Unix-based, it also uses:

Strong file permission models
User privilege separation

Linux Security

Linux uses a strong Unix security model.

Key security mechanisms include:

File permissions (read, write, execute)
User and group ownership
Privilege escalation control
Secure system architecture

Advanced security frameworks include:

SELinux
AppArmor

Linux is widely used in security-sensitive environments such as:

Servers
Cloud infrastructure
Network security systems

7. Customization and Flexibility

Windows

Windows allows limited customization.

Users can:

Change system themes
Modify settings
Install additional tools

However, the core system is closed-source and cannot be modified.

macOS

macOS allows moderate customization but maintains strict system control.

Users can:

Install third-party applications
Customize desktop environments
Use Unix command-line tools

But system-level modification is restricted.

Linux

Linux provides extreme customization.

Users can modify:

The desktop environment
System components
Kernel modules
System behavior

Examples of Linux desktop environments:

GNOME
KDE Plasma
XFCE
LXDE

Users can even build minimal Linux systems that only include essential components.

8. Command Line Usage

Command-line interfaces are used differently in each system.

Windows

Windows provides:

Command Prompt
PowerShell

PowerShell is widely used in enterprise system administration and automation.

macOS

macOS includes the Terminal application with a Unix shell.

Common shells:

zsh (default)
bash

This allows developers and administrators to use Unix commands.

Linux

Linux relies heavily on the command line.

Common shells include:

bash
zsh
sh

The command line is widely used for:

System administration
Server management
Automation
Scripting

9. Typical Use in IT Environments

Windows in IT Environments

Common roles include:

Corporate desktop systems
Enterprise Active Directory environments
Microsoft application ecosystems
Business software platforms

Examples of enterprise technologies:

Active Directory
Microsoft 365
Exchange Server
SharePoint

macOS in IT Environments

macOS is commonly used for:

Mobile application development (iOS/macOS apps)
Graphic design and media production
Software development environments
Apple device management ecosystems

Linux in IT Environments

Linux is dominant in many infrastructure environments.

Typical uses include:

Web servers
Cloud platforms
Container environments
Network services
Cybersecurity systems
DevOps environments

Linux is the primary OS used in:

Cloud infrastructure
Supercomputers
Container platforms

10. Summary Comparison

Feature	Windows	macOS	Linux
License	Proprietary	Proprietary	Open Source
Hardware Support	Very broad	Apple hardware only	Very broad
Customization	Limited	Moderate	Very high
Software Installation	Installers / Store	App Store / DMG	Package managers
Command Line	CMD / PowerShell	Unix Terminal	Strong CLI usage
Typical Use	Desktop enterprise	Creative + development	Servers + infrastructure