How do I learn using both the TUI and the Web GUI?

Clone https://github.com/1nc0gn30/30-days-of-Linux-Fundamentals and run ./control-panel for the native C terminal TUI (with built-in Markdown reader, Flashcard Arena, and /tmp sandbox shells), or use the Astro Web GUI for browser command drills, XP tracking, and visual chmod/FHS calculators.

Is 30 Days of Linux Fundamentals completely free?

Yes, 100% of the 30 days, 90 study guides, C TUI drills, and web tools are open-source and unlocked by default with zero paywalls.

← Back to 30-Day Curriculum

WEEK 4 · ADVANCED OPS · TUI: ./control-panel --day 27

Day 27: Troubleshooting: Boot Recovery, Locks & Forensics

Triage broken boot sequences, trace open file descriptors with lsof, and inspect kernel ring buffers.

XP 0

Streak 0

Command Mastery 0%

Study Music

YouTube Study Radio

Pick a track or paste any YouTube URL.

🍳 Breakfast (Syntax) Session

Type commands, build streaks, and then review the source guide.

Live Terminal Drill

Re-type the command exactly to clear each challenge.

target$ loading...

0 / 12 mastered

Command Board

Tap a command when you practiced it in your own terminal.

Command Intel

Meaning

Command explanation will appear here.

Sample Output

Output preview will appear here.

Useful Fun Fact

Fun facts about the active command will appear here.

Last Run Output

Run a command to see result feedback.

Knowledge Boost

Faster learning with topic cues, mini-missions, and external docs.

Key Topics

⚡ 60-Second Mental Model (Student Digest)🥣 Day 27 - Breakfast: What is Docker?🎯 Objective📘 Understanding Containers🐳 Installing Docker🧠 Docker vs Virtual Machines

Mini Missions

Mission 1: Run journalctl -xb and explain the output in one sentence.
Mission 2: Run fsck and explain the output in one sentence.
Mission 3: Run lsof and explain the output in one sentence.
Mission 4: Run mkdir -p /tmp/linux-dojo-day-27 && cd /tmp/linux-dojo-day-27 and explain the output in one sentence.

Useful Resources

📖 Digestible Study Guide & Visual Architecture

Source: day-27-breakfast-study-guide.md · Synced with ./control-panel --day 27

Day 27 · Breakfast — Troubleshooting Methodology: Boot Recovery, Locks & Forensics

ZothOS × 1nc0gn30 Linux Dojo · Phase: Week 4 (Advanced Ops) · Session: Breakfast (Morning Foundation & Core Command Syntax)

Core Commands: journalctl -xb, dmesg, fsck, lsof, fuser, strace

⚡ 60-Second Mental Model (Student Digest)

╔══════════════════════════════════════════════════════════════════════════════╗
║  ZOTHOS × 1NC0GN30 // PRODUCTION TELEMETRY, SYSTEMD & RECOVERY MATRIX        ║
╠══════════════════════════════════════════════════════════════════════════════╣
║                                                                              ║
║   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐  ║
║   │ CPU & SCHED  │   │ MEMORY / VM  │   │ DISK & VFS   │   │ NET SOCKETS  │  ║
║   │ top / mpstat │   │ free / vmstat│   │ iostat / df  │   │ ss -tulpen   │  ║
║   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘  ║
║          └──────────────────┴─────────┬────────┴──────────────────┘          ║
║                                       ▼                                      ║
║                  [ Automated Remediation: systemd + cron + rsync ]           ║
╚══════════════════════════════════════════════════════════════════════════════╝

Learning Pillar	How to Practice This Session
1. Native TUI (`./control-panel`)	Run `./control-panel` from repo root → Select Week 4 → Day 27 → Breakfast to drill interactive C lessons & quizzes.
2. Web Workstation (`astro-ui`)	Open `/day/27` → Select Breakfast tab → Type each target command in the live Mission Terminal to earn XP & streak mastery.
3. Safe Local Sandbox	Run `mkdir -p /tmp/linux-dojo-day-27 && cd /tmp/linux-dojo-day-27` to test every flag below without touching production files.

🥣 Day 27 - Breakfast: What is Docker?

🎯 Objective

Understand containerization fundamentals, install Docker, and compare containers vs VMs.

📘 Understanding Containers

* Containers are lightweight, portable units for software that package code and dependencies.
* Docker allows developers to easily deploy apps across systems.
* Key advantages: fast boot, isolated environments, scalable.

🐳 Installing Docker

#### On Ubuntu/Debian:

sudo apt update
sudo apt install docker.io -y
sudo systemctl enable --now docker

#### Verify Installation:

docker --version
docker run hello-world

🧠 Docker vs Virtual Machines

Feature	Docker (Containers)	Virtual Machines
Boot Time	Seconds	Minutes
Resource Usage	Low	High
Isolation	Process-level	Full OS-level
Portability	High	Moderate

✅ Review Questions

1. What makes Docker containers faster than VMs?
2. How do containers ensure app portability?
3. Which command tests Docker installation?

🥗 Day 27 - Lunch: Working with Docker Images and Containers

🎯 Objective

Learn Docker image basics, run containers, and manage their lifecycle.

📦 Docker Images

* Images are the blueprints of containers.
* Use docker pull to download images from Docker Hub.

#### Example:

docker pull nginx

🚀 Running Containers

* Containers are instances of images.

docker run -d -p 8080:80 nginx

* -d runs it in background, -p maps ports.

🔧 Managing Containers

* List containers:

docker ps -a

* Stop a container:

docker stop <container_id>

* Remove a container:

docker rm <container_id>

✅ Review Questions

1. How do you list all Docker containers?
2. What’s the difference between an image and a container?
3. Which flag runs a container in detached mode?

🥪 Lunch (Workflows) Session

Type commands, build streaks, and then review the source guide.

Live Terminal Drill

Re-type the command exactly to clear each challenge.

target$ loading...

0 / 12 mastered

Command Board

Tap a command when you practiced it in your own terminal.

Command Intel

Meaning

Command explanation will appear here.

Sample Output

Output preview will appear here.

Useful Fun Fact

Fun facts about the active command will appear here.

Last Run Output

Run a command to see result feedback.

Knowledge Boost

Faster learning with topic cues, mini-missions, and external docs.

Key Topics

⚡ 60-Second Mental Model (Student Digest)🥗 Day 27 - Lunch: Working with Docker Images and Containers🎯 Objective📦 Docker Images🚀 Running Containers🔧 Managing Containers

Mini Missions

Mission 1: Run journalctl -xb and explain the output in one sentence.
Mission 2: Run fsck and explain the output in one sentence.
Mission 3: Run lsof and explain the output in one sentence.
Mission 4: Run mkdir -p /tmp/linux-dojo-day-27 && cd /tmp/linux-dojo-day-27 and explain the output in one sentence.

Useful Resources

📖 Digestible Study Guide & Visual Architecture

Source: day-27-lunch-study-guide.md · Synced with ./control-panel --day 27

Day 27 · Lunch — Troubleshooting Methodology: Boot Recovery, Locks & Forensics

ZothOS × 1nc0gn30 Linux Dojo · Phase: Week 4 (Advanced Ops) · Session: Lunch (Midday Operational Workflows & Flag Mastery)

Core Commands: journalctl -xb, dmesg, fsck, lsof, fuser, strace

⚡ 60-Second Mental Model (Student Digest)

╔══════════════════════════════════════════════════════════════════════════════╗
║  ZOTHOS × 1NC0GN30 // PRODUCTION TELEMETRY, SYSTEMD & RECOVERY MATRIX        ║
╠══════════════════════════════════════════════════════════════════════════════╣
║                                                                              ║
║   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐  ║
║   │ CPU & SCHED  │   │ MEMORY / VM  │   │ DISK & VFS   │   │ NET SOCKETS  │  ║
║   │ top / mpstat │   │ free / vmstat│   │ iostat / df  │   │ ss -tulpen   │  ║
║   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘  ║
║          └──────────────────┴─────────┬────────┴──────────────────┘          ║
║                                       ▼                                      ║
║                  [ Automated Remediation: systemd + cron + rsync ]           ║
╚══════════════════════════════════════════════════════════════════════════════╝

Learning Pillar	How to Practice This Session
1. Native TUI (`./control-panel`)	Run `./control-panel` from repo root → Select Week 4 → Day 27 → Lunch to drill interactive C lessons & quizzes.
2. Web Workstation (`astro-ui`)	Open `/day/27` → Select Lunch tab → Type each target command in the live Mission Terminal to earn XP & streak mastery.
3. Safe Local Sandbox	Run `mkdir -p /tmp/linux-dojo-day-27 && cd /tmp/linux-dojo-day-27` to test every flag below without touching production files.

🥗 Day 27 - Lunch: Working with Docker Images and Containers

🎯 Objective

Learn Docker image basics, run containers, and manage their lifecycle.

📦 Docker Images

* Images are the blueprints of containers.
* Use docker pull to download images from Docker Hub.

#### Example:

docker pull nginx

🚀 Running Containers

* Containers are instances of images.

docker run -d -p 8080:80 nginx

* -d runs it in background, -p maps ports.

🔧 Managing Containers

* List containers:

docker ps -a

* Stop a container:

docker stop <container_id>

* Remove a container:

docker rm <container_id>

✅ Review Questions

1. How do you list all Docker containers?
2. What’s the difference between an image and a container?
3. Which flag runs a container in detached mode?

🍽️ Dinner (Hardening) Session

Type commands, build streaks, and then review the source guide.

Live Terminal Drill

Re-type the command exactly to clear each challenge.

target$ loading...

0 / 12 mastered

Command Board

Tap a command when you practiced it in your own terminal.

Command Intel

Meaning

Command explanation will appear here.

Sample Output

Output preview will appear here.

Useful Fun Fact

Fun facts about the active command will appear here.

Last Run Output

Run a command to see result feedback.

Knowledge Boost

Faster learning with topic cues, mini-missions, and external docs.

Key Topics

⚡ 60-Second Mental Model (Student Digest)🍽️ Day 27 - Dinner: Practical Docker Labs🎯 Objective🔨 Lab Task 1: Run Your First Container🏗️ Lab Task 2: Build a Custom Image🧹 Lab Task 3: Manage Containers

Mini Missions

Mission 1: Run journalctl -xb and explain the output in one sentence.
Mission 2: Run fsck and explain the output in one sentence.
Mission 3: Run lsof and explain the output in one sentence.
Mission 4: Run mkdir -p /tmp/linux-dojo-day-27 && cd /tmp/linux-dojo-day-27 and explain the output in one sentence.

Useful Resources

📖 Digestible Study Guide & Visual Architecture

Source: day-27-dinner-study-guide.md · Synced with ./control-panel --day 27

Day 27 · Dinner — Troubleshooting Methodology: Boot Recovery, Locks & Forensics

ZothOS × 1nc0gn30 Linux Dojo · Phase: Week 4 (Advanced Ops) · Session: Dinner (Evening Hardening, Pipelines & Verification Lab)

Core Commands: journalctl -xb, dmesg, fsck, lsof, fuser, strace

⚡ 60-Second Mental Model (Student Digest)

╔══════════════════════════════════════════════════════════════════════════════╗
║  ZOTHOS × 1NC0GN30 // PRODUCTION TELEMETRY, SYSTEMD & RECOVERY MATRIX        ║
╠══════════════════════════════════════════════════════════════════════════════╣
║                                                                              ║
║   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐   ┌──────────────┐  ║
║   │ CPU & SCHED  │   │ MEMORY / VM  │   │ DISK & VFS   │   │ NET SOCKETS  │  ║
║   │ top / mpstat │   │ free / vmstat│   │ iostat / df  │   │ ss -tulpen   │  ║
║   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘   └──────┬───────┘  ║
║          └──────────────────┴─────────┬────────┴──────────────────┘          ║
║                                       ▼                                      ║
║                  [ Automated Remediation: systemd + cron + rsync ]           ║
╚══════════════════════════════════════════════════════════════════════════════╝

Learning Pillar	How to Practice This Session
1. Native TUI (`./control-panel`)	Run `./control-panel` from repo root → Select Week 4 → Day 27 → Dinner to drill interactive C lessons & quizzes.
2. Web Workstation (`astro-ui`)	Open `/day/27` → Select Dinner tab → Type each target command in the live Mission Terminal to earn XP & streak mastery.
3. Safe Local Sandbox	Run `mkdir -p /tmp/linux-dojo-day-27 && cd /tmp/linux-dojo-day-27` to test every flag below without touching production files.

🍽️ Day 27 - Dinner: Practical Docker Labs

🎯 Objective

Apply your Docker knowledge by running and managing containers and images.

🔨 Lab Task 1: Run Your First Container

docker run hello-world

This checks if Docker is installed properly.

🏗️ Lab Task 2: Build a Custom Image

1. Create a file named Dockerfile:

FROM alpine
CMD ["echo", "Hello from custom Docker image!"]

2. Build the image:

docker build -t myimage .

🧹 Lab Task 3: Manage Containers

* View containers:

docker ps -a

* Clean up:

docker stop $(docker ps -aq)
docker rm $(docker ps -aq)
docker image prune -a

✅ Review Questions

1. What does docker build do?
2. Why is it helpful to prune images?
3. What’s the purpose of the Dockerfile?

You're now equipped to build and manage Docker containers effectively!