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Intro to Programming Languages

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Commands

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Command Arguments

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Command History

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The Root Path

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Absolute Paths

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Changing position

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Changing to an Absolute Path

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Relative Paths

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Cat

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Ls

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Ls All

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Find

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Piping Echo

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Piping Stdout

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Piping Stdin

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Start Here

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Using the Terminal

Time of First Successful Submission: 2026-03-29 09:40:42

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-29 09:39:48

Using the GUI Desktop

Time of First Successful Submission: 2026-03-29 09:46:00

Pasting into the Desktop

Time of First Successful Submission: 2026-03-29 09:47:15

Restarting Challenges

Time of First Successful Submission: 2026-03-29 10:00:08

Challenge Programs

Time of First Successful Submission: 2026-03-29 14:09:11

The Flag File

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Using Privileged Mode

Time of First Successful Submission: 2026-03-29 14:15:51

Persistent Home Directories - One

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Persistent Home Directories - Two

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Linux Luminarium

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Intro to Commands

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Intro to Arguments

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Command History

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The Root

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Program and absolute paths

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Position thy self

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Position elsewhere

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implicit relative paths, from /

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explicit relative paths, from /

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implicit relative path

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home sweet home

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cat: not the pet, but the command!

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catting absolute paths

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more catting practice

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grepping for a needle in a haystack

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comparing files

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listing files

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touching files

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removing files

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moving files

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copying files

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hidden files

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An Epic Filesystem Quest

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making directories

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finding files

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linking files

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Learning From Documentation

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Learning Complex Usage

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Reading Manuals

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Searching Manuals

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Searching For Manuals

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Helpful Programs

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Help for Builtins

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Matching with *

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Matching with ?

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Matching with []

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Matching paths with []

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Multiple globs

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Mixing globs

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Exclusionary globbing

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Tab completion

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Multiple options for tab completion

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Tab completion on commands

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Redirecting output

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Redirecting more output

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Appending output

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Redirecting errors

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Redirecting input

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Grepping stored results

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Grepping live output

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Grepping errors

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Filtering with grep -v

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Filtering with sed

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Duplicating piped data with tee

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Process substitution for input

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Writing to multiple programs

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Split-piping stderr and stdout

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Named pipes

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Printing Variables

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Setting Variables

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Multi-word Variables

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Exporting Variables

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Printing Exported Variables

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Storing Command Output

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Reading Input

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Reading Files

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Translating characters

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Deleting characters

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Deleting newlines

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Extracting the first lines with head

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Extracting specific sections of text

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Sorting data

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Listing Processes

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Killing Processes

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Interrupting Processes

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Killing Misbehaving Processes

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Suspending Processes

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Resuming Processes

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Backgrounding Processes

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Foregrounding Processes

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Starting Backgrounded Processes

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Process Exit Codes

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Becoming root with su

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Other users with su

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Cracking passwords

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Using sudo

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Changing File Ownership

Time of First Successful Submission: 2026-04-03 08:05:42

Groups and Files

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Fun With Groups Names

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Changing Permissions

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Executable Files

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Permission Tweaking Practice

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Permissions Setting Practice

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The SUID Bit

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Chaining with Semicolons

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Building on Success

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Handling Failure

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Your First Shell Script

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Redirecting Script Output

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Executable Shell Scripts

Time of First Successful Submission: 2026-04-04 16:06:09

Understanding Shebangs

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Scripting with Arguments

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Scripting with Conditionals

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Scripting with Default Cases

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Scripting with Multiple Conditions

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Reading Shell Scripts

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Launching Screen

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Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-04-07 05:11:40

Switching Windows

Time of First Successful Submission: 2026-04-07 05:19:09

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-07 05:27:05

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-07 05:33:06

The PATH Variable

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Setting PATH

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Finding Commands

Time of First Successful Submission: 2026-04-04 17:50:03

Adding Commands

Time of First Successful Submission: 2026-04-04 18:01:37

Hijacking Commands

Time of First Successful Submission: 2026-04-04 18:14:40

Bashrc Backdoor

Time of First Successful Submission: 2026-04-05 10:00:07

Sniffing Input

Time of First Successful Submission: 2026-04-05 10:31:54

Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

Time of First Successful Submission: 2026-04-05 12:00:29

Snooping on Configurations

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The Fork Bomb

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Disk-Space Doomsday

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rm -rf /

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Life after rm -rf /

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Finding meaning after rm -rf /

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Computing 101

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Your First Register

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Your First Syscall

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Exit Codes

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Building Executables

Time of First Successful Submission: 2026-04-09 15:47:42

Moving Between Registers

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Loading From Memory

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More Loading Practice

Time of First Successful Submission: 2026-04-09 16:36:35

Dereferencing Pointers

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Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

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Double Dereference

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The Stack

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Stack Offsets

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Program Arguments on the Stack

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Popping From the Stack

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Disassembling Programs

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Tracing Syscalls

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Starting GDB

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Quitting GDB

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Starting Programs in GDB

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Disassembling in GDB

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Stepping Through Instructions

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Reading Register Values

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Popping Stack Values

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Examining Memory

Time of First Successful Submission: 2026-04-10 11:57:31

Examining Stack Pointers

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Cooperative Debugging

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Writing Output

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Chaining Syscalls

Time of First Successful Submission: 2026-04-10 16:59:06

Writing Strings

Time of First Successful Submission: 2026-04-10 17:00:11

Reading Data

Time of First Successful Submission: 2026-04-10 17:08:41

Opening Files

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Hardcoding the Filename

Time of First Successful Submission: 2026-04-10 17:32:17

Comparing Values

Time of First Successful Submission: 2026-04-11 06:37:01

Comparing Characters

Time of First Successful Submission: 2026-04-11 08:15:21

Conditional Control Flow

Time of First Successful Submission: 2026-04-11 08:22:30

Comparing Strings

Time of First Successful Submission: 2026-04-11 09:08:52

Reverse the Password

Time of First Successful Submission: 2026-04-11 10:00:55

Conditionals Without Conditionals

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Looping

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Reverse the Calculation

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Reverse the Reverse

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Dealing with Bitwise Operations

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Loops on Data

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set-register

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set-multiple-registers

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add-to-register

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linear-equation-registers

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integer-division

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modulo-operation

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set-upper-byte

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efficient-modulo

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byte-extraction

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bitwise-and

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check-even

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memory-read

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memory-write

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memory-increment

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byte-access

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memory-size-access

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little-endian-write

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memory-sum

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stack-subtraction

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swap-stack-values

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average-stack-values

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absolute-jump

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relative-jump

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jump-trampoline

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conditional-jump

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indirect-jump

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average-loop

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count-non-zero

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string-lower

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most-common-byte

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Exit

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Socket

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Bind

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Listen

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Accept

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Static Response

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Dynamic Response

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Iterative GET Server

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Concurrent GET Server

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Concurrent POST Server

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Web Server

Time of First Successful Submission: 2026-04-15 02:33:29

Debugging Programs

Time of First Successful Submission: 2026-04-15 02:53:46

Inspecting Registers

Time of First Successful Submission: 2026-04-15 02:57:09

Examining Memory

Time of First Successful Submission: 2026-04-15 03:18:04

Setting Breakpoints

Time of First Successful Submission: 2026-04-15 03:36:42

GDB Scripting

Time of First Successful Submission: 2026-04-15 03:56:00

Modifying Data

Time of First Successful Submission: 2026-04-15 04:06:28

Modifying Execution

Time of First Successful Submission: 2026-04-15 04:09:33

Broken Functions

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-04-15 04:51:13

... and again!

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Newline Troubles

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Reasoning about files

Time of First Successful Submission: 2026-04-15 05:01:44

Specifying Filenames

Time of First Successful Submission: 2026-04-15 16:07:11

Binary and Hex Encoding

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More Hex

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Decoding Hex

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GCA CTF

12 / 104 2172 / 44123

Using the Terminal

Time of First Successful Submission: 2026-03-29 09:40:42

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-29 09:39:48

Using the GUI Desktop

Time of First Successful Submission: 2026-03-29 09:46:00

Pasting into the Desktop

Time of First Successful Submission: 2026-03-29 09:47:15

Connecting over SSH

Time of First Successful Submission: 2026-03-29 09:56:49

Restarting Challenges

Time of First Successful Submission: 2026-03-29 10:00:08

Getting Help

Time of First Successful Submission: 2026-03-29 10:03:30

Challenge Programs

Time of First Successful Submission: 2026-03-29 14:09:11

The Flag File

Time of First Successful Submission: 2026-03-29 14:11:22

Using Privileged Mode

Time of First Successful Submission: 2026-03-29 14:15:51

Persistent Home Directories - One

Time of First Successful Submission: 2026-03-29 14:18:02

Persistent Home Directories - Two

Time of First Successful Submission: 2026-03-29 14:18:46