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Introduction to Linux

This hands-on course builds a practical foundation in Linux for desktop and server use. You will learn the command line,...

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Sections

1. Linux Fundamentals and History
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Discover Linux origins, ecosystem, and core concepts to frame practical skills.

15 topics (15 versions)

1.1Unix lineage

1.2GNU project

1.3Linux kernel

1.4Distro overview

1.5Release models

1.6Desktop vs server

1.7Shell vs GUI

1.8FHS overview

1.9Man pages

1.10Help resources

1.11TTY and PTY

1.12Virtual consoles

1.13Open-source licenses

1.14Community support

1.15Getting a distro

2. Command Line Basics
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Master the terminal, essential commands, navigation, and command composition.

15 topics (15 versions)

2.1Terminal emulators

2.2Prompt anatomy

2.3cd, pwd, ls

2.4Tab completion

2.5Command history

2.6echo and printf

2.7type and which

2.8--help and man

2.9Wildcards

2.10Quoting rules

2.11Pipes

2.12Redirection

2.13tee

2.14Command chaining

2.15Exit statuses

3. Filesystem and File Management
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Work with paths, files, directories, links, archives, and search tools.

15 topics (15 versions)

3.1Path types

3.2ls options

3.3mkdir, rmdir

3.4touch

3.5cp, mv

3.6rm safely

3.7find basics

3.8locate, updatedb

3.9file command

3.10Hard links

3.11Symbolic links

3.12du usage

3.13df usage

3.14tar basics

3.15Compression tools

4. Text Processing and Editors
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Edit, view, and transform text using editors and classic Unix filters.

15 topics (15 versions)

4.1nano basics

4.2vim modes

4.3emacs intro

4.4less and more

4.5cat and tac

4.6head and tail

4.7wc

4.8sort

4.9uniq

4.10cut

4.11paste

4.12tr

4.13grep and egrep

4.14sed basics

4.15awk basics

5. Users, Groups, and Permissions
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Manage identities and control access with permissions, ACLs, and sudo.

15 topics (15 versions)

5.1useradd, usermod

5.2groupadd, gpasswd

5.3/etc/passwd

5.4/etc/shadow

5.5id, whoami, who

5.6su and sudo

5.7chmod symbolic

5.8chmod numeric

5.9chown, chgrp

5.10umask

5.11SUID, SGID, sticky

5.12ACLs

5.13Login shells

5.14Default groups

5.15Password policies

6. Processes and Job Control
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Observe, prioritize, signal, and manage foreground and background work.

15 topics (15 versions)

6.1PID and PPID

6.2ps basics

6.3top and htop

6.4jobs, bg, fg

6.5nohup, disown

6.6nice, renice

6.7kill signals

6.8xargs basics

6.9time command

6.10pgrep, pkill

6.11watch

6.12lsof

6.13strace intro

6.14/proc overview

6.15ulimit

7. Package Management and Software
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Install, update, and verify software across major package ecosystems.

15 topics (15 versions)

7.1Package concepts

7.2Repositories

7.3apt basics

7.4dpkg

7.5dnf and yum

7.6rpm

7.7zypper

7.8pacman

7.9snap

7.10flatpak

7.11AppImage

7.12Build from source

7.13make and gcc

7.14Verify packages

7.15Clean caches

8. Shells and Shell Scripting Basics
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Customize shells and write reliable scripts using core Bash constructs.

15 topics (15 versions)

8.1Bash vs Zsh

8.2Startup files

8.3Variables

8.4Exported env

8.5Aliases

8.6Command substitution

8.7Arithmetic

8.8Globbing

8.9test and [

8.10if, elif, else

8.11case

8.12for loops

8.13while loops

8.14Functions

8.15Shebang

9. Networking Essentials
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Configure interfaces, resolve names, transfer files, and test connectivity.

15 topics (15 versions)

9.1IP basics

9.2ip command

9.3Hostname, hosts

9.4DNS resolvers

9.5ping

9.6traceroute

9.7netstat, ss

9.8curl

9.9wget

9.10scp, sftp

9.11ssh basics

9.12SSH keys

9.13Firewalls overview

9.14ufw basics

9.15nmap intro

10. System Services and init (systemd)
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Manage boot, services, logs, dependencies, and user-level services.

15 topics (15 versions)

10.1init concepts

10.2Unit types

10.3systemctl basics

10.4journalctl basics

10.5Targets

10.6Timers

10.7Enable services

10.8Mask services

10.9Dependencies

10.10SysV scripts

10.11Socket activation

10.12Env files

10.13User services

10.14cgroups overview

10.15Boot sequence

11. Storage, Disks, and Filesystems
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Partition, format, mount, and manage storage with LVM, RAID, and SMART.

15 topics (15 versions)

11.1Device names

11.2lsblk, blkid

11.3MBR vs GPT

11.4fdisk, gdisk

11.5mkfs

11.6mount, umount

11.7fstab

11.8Swap

11.9LVM concepts

11.10lvm commands

11.11RAID mdadm

11.12Quotas

11.13Inodes

11.14SMART tools

11.15Filesystem check

12. System Monitoring and Logging
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Gather metrics, inspect logs, and trace performance bottlenecks.

15 topics (15 versions)

12.1uptime, free

12.2vmstat

12.3iostat

12.4sar intro

12.5dmesg

12.6journalctl filters

12.7rsyslog

12.8logrotate

12.9df and du

12.10inotifywait

12.11perf intro

12.12lscpu, lspci

12.13lsusb

12.14sensors

12.15auditd intro

13. Security Basics
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Apply foundational security practices and use mandatory access controls.

15 topics (15 versions)

13.1Threat modeling

13.2Patching

13.3Least privilege

13.4Sudo policies

13.5File permissions

13.6Firewall rules

13.7fail2ban

13.8SSH hardening

13.9SELinux modes

13.10AppArmor

13.11GPG basics

13.12Checksums

13.13Password hygiene

13.14Backup strategies

13.15Security logs

14. Automation, Scheduling, and Cron
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Schedule, orchestrate, and harden repeatable tasks with cron and timers.

15 topics (15 versions)

14.1Cron syntax

14.2crontab -e

14.3systemd timers

14.4at and batch

14.5anacron

14.6Idempotent scripts

14.7Task logging

14.8Cron environment

14.9Mail notifications

14.10Dependencies

14.11Retries

14.12Simple Makefiles

14.13rsync jobs

14.14expect intro

14.15Scheduling pitfalls

15. Troubleshooting and Best Practices
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Diagnose common failures and apply resilient, maintainable workflows.

15 topics (15 versions)

15.1Boot issues

15.2Rescue mode

15.3Single-user mode

15.4GRUB basics

15.5Network failures

15.6Service failures

15.7Permission denied

15.8Disk full

15.9Memory leaks

15.10High CPU

15.11Slow I/O

15.12Broken packages

15.13Reading logs

15.14Recovery backups

15.15Getting help

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Introduction to Linux

Sections

1. Linux Fundamentals and History0 views

2. Command Line Basics0 views

3. Filesystem and File Management0 views

4. Text Processing and Editors0 views

5. Users, Groups, and Permissions0 views

6. Processes and Job Control0 views

7. Package Management and Software0 views

8. Shells and Shell Scripting Basics0 views

9. Networking Essentials0 views

10. System Services and init (systemd)0 views

11. Storage, Disks, and Filesystems0 views

12. System Monitoring and Logging0 views

13. Security Basics0 views

14. Automation, Scheduling, and Cron0 views

15. Troubleshooting and Best Practices0 views

Sign in to track your progress

1. Linux Fundamentals and History
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2. Command Line Basics
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3. Filesystem and File Management
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4. Text Processing and Editors
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5. Users, Groups, and Permissions
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6. Processes and Job Control
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7. Package Management and Software
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8. Shells and Shell Scripting Basics
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9. Networking Essentials
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10. System Services and init (systemd)
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11. Storage, Disks, and Filesystems
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12. System Monitoring and Logging
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13. Security Basics
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14. Automation, Scheduling, and Cron
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15. Troubleshooting and Best Practices
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