beginner

Learn the ways of Linux-fu, for free.

Grasshopper

Getting Started

Getting Started

What is Linux? Get started with choosing a distribution and installation.
Command Line

Command Line

Learn the fundamentals of the command line, navigating files, directories and more.
Text-Fu

Text-Fu

Learn basic text manipulation and navigation.
Advanced Text-Fu

Advanced Text-Fu

Navigate text like a Linux spider monkey with vim and emacs.
User Management

User Management

Learn about user roles and management.
Permissions

Permissions

Learn about permission levels and modifying permissions.
Processes

Processes

Learn about the running processes on the system.
Packages

Packages

Learn all about the dpkg, apt-get, rpm and yum package management tools.

Journeyman

Devices

Devices

Learn about Linux devices and how they interact with the kernel and user space.
The Filesystem

The Filesystem

Learn about the Linux filesystem, the different types of filesystems, partitioning and more.
Boot the System

Boot the System

Learn about the stages of the Linux boot process.
Kernel

Kernel

The most important part of the Linux system, learn about how it works and how to configure it.
Init

Init

Learn about the different init systems, SysV, Upstart and systemd.
Process Utilization

Process Utilization

Learn resource monitoring with top, load averages, iostat and more!
Logging

Logging

Learn about system logs and the /var/log directory.

Networking Nomad

Network Sharing

Network Sharing

Learn about network sharing with rsync, scp, nfs and more.
Network Basics

Network Basics

Learn about networking basics and the TCP/IP model.
Subnetting

Subnetting

Learn about subnets and how to do subnet arithmetic!
Routing

Routing

Learn how packets are routed across networks!
Network Config

Network Config

Learn about network configuration using Linux tools!
Troubleshooting

Troubleshooting

Learn about common networking tools to help you diagnose and troubleshoot issues!
DNS

DNS

Everything and more that you wanted to know about DNS.

Recommended Resources

How Linux Works: What Every Superuser Should Know

One of my most highly recommended books!

UNIX and Linux System Administration Handbook, 4th Edition

Extremely comprehensive book for every SysAdmin.

Linux Command Line and Shell Scripting Bible

Great comprehensive guide to shell scripting.

The Linux Programming Interface: A Linux and UNIX System Programming Handbook

For serious Linux-users, great start into kernel programming.