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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-04-24 13:24:44

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

Time of First Successful Submission: 2026-04-24 13:28:07

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

Time of First Successful Submission: 2026-04-25 12:08:24

Piping Stdout

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Piping Stdin

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Start Here

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Using the Terminal

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Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Restarting Challenges

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Challenge Programs

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The Flag File

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Using Privileged Mode

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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

Time of First Successful Submission: 2026-04-24 13:24:44

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

Time of First Successful Submission: 2026-05-11 11:58:21

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

Time of First Successful Submission: 2026-04-24 14:10:19

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

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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

Time of First Successful Submission: 2026-05-11 12:14:06

Redirecting Script Output

Time of First Successful Submission: 2026-05-12 10:36:56

Executable Shell Scripts

Time of First Successful Submission: 2026-05-12 06:02:16

Understanding Shebangs

Time of First Successful Submission: 2026-05-12 06:05:03

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

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Switching Windows

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Detaching and Attaching (tmux)

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Switching Windows (tmux)

Time of First Successful Submission: 2026-04-26 14:00:21

The PATH Variable

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Setting PATH

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Finding Commands

Time of First Successful Submission: 2026-04-26 14:07:58

Adding Commands

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Hijacking Commands

Time of First Successful Submission: 2026-04-26 16:22:21

Bashrc Backdoor

Time of First Successful Submission: 2026-05-12 07:06:55

Sniffing Input

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Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

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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

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Moving Between Registers

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Loading From Memory

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More Loading Practice

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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: 2026-04-27 09:12:44

Examining Stack Pointers

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Cooperative Debugging

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Writing Output

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Chaining Syscalls

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Writing Strings

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Reading Data

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Opening Files

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Hardcoding the Filename

Time of First Successful Submission: 2026-04-27 10:29:39

Comparing Values

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Comparing Characters

Time of First Successful Submission: 2026-04-27 11:37:04

Conditional Control Flow

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Comparing Strings

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Reverse the Password

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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: 2026-05-05 18:00:01

Debugging Programs

Time of First Successful Submission: 2026-05-06 08:46:22

Inspecting Registers

Time of First Successful Submission: 2026-05-06 11:58:04

Examining Memory

Time of First Successful Submission: 2026-05-06 12:05:58

Setting Breakpoints

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GDB Scripting

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Modifying Data

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Modifying Execution

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Broken Functions

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-05-06 17:55:45

... and again!

Time of First Successful Submission: 2026-05-06 17:56:18

Newline Troubles

Time of First Successful Submission: 2026-05-06 18:07:35

Reasoning about files

Time of First Successful Submission: 2026-05-06 18:09:48

Specifying Filenames

Time of First Successful Submission: 2026-05-06 18:11:31

Binary and Hex Encoding

Time of First Successful Submission: 2026-05-07 07:57:57

More Hex

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Decoding Hex

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Decoding Practice

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Encoding Practice

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Hex-encoding ASCII

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Nested Encoding

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Hex-encoding UTF-8

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UTF Mixups

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Modifying Encoded Data

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Decoding Base64

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Encoding Base64

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Dealing with Obfuscation

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Dealing with Obfuscation 2

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Your First HTTP Request

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Reading Flask

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Commented Data

Time of First Successful Submission: 2026-05-07 19:20:40

HTTP Metadata

Time of First Successful Submission: 2026-05-08 05:41:55

HTTP (netcat)

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HTTP Paths (netcat)

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HTTP (curl)

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HTTP (python)

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HTTP Host Header (python)

Time of First Successful Submission: 2026-05-09 04:32:03

HTTP Host Header (curl)

Time of First Successful Submission: 2026-05-09 04:36:40

cat

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more

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less

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tail

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head

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sort

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vim

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emacs

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nano

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rev

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od

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hd

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xxd

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base32

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base64

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split

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gzip

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bzip2

Time of First Successful Submission: 2026-05-12 11:06:58

zip

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tar

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ar

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cpio

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env

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find

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make

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nice

Time of First Successful Submission: 2026-05-12 17:14:43

timeout

Time of First Successful Submission: 2026-05-12 17:15:41

stdbuf

Time of First Successful Submission: 2026-05-12 17:17:27

setarch

Time of First Successful Submission: 2026-05-12 17:19:37

watch

Time of First Successful Submission: 2026-05-13 07:08:26

socat

Time of First Successful Submission: 2026-05-13 07:10:57

whiptail

Time of First Successful Submission: 2026-05-13 07:14:04

awk

Time of First Successful Submission: 2026-05-13 07:15:47

sed

Time of First Successful Submission: 2026-05-13 07:18:25

ed

Time of First Successful Submission: 2026-05-13 07:19:40

chown

Time of First Successful Submission: 2026-05-11 08:03:04

chmod

Time of First Successful Submission: 2026-05-13 07:20:08

cp

Time of First Successful Submission: 2026-05-13 07:20:59

perl

Time of First Successful Submission: 2026-05-13 07:44:58

python

Time of First Successful Submission: 2026-05-13 07:40:57

ruby

Time of First Successful Submission: 2026-05-13 10:13:02

bash

Time of First Successful Submission: 2026-05-13 07:48:00

date

Time of First Successful Submission: 2026-05-13 10:16:02

dmesg

Time of First Successful Submission: 2026-05-13 10:16:53

wc

Time of First Successful Submission: 2026-05-13 10:22:42

gcc

Time of First Successful Submission: 2026-05-13 10:28:19

as

Time of First Successful Submission: 2026-05-13 10:31:38

wget

Time of First Successful Submission: 2026-05-13 10:50:02

ssh-keygen

Time of First Successful Submission: 2026-05-13 11:39:50

SQL Queries

Time of First Successful Submission: 2026-05-12 17:22:23

Filtering SQL

Time of First Successful Submission: 2026-05-12 17:24:47

Choosing Columns

Time of First Successful Submission: 2026-05-12 17:28:09

Exclusionary Filtering

Time of First Successful Submission: 2026-05-12 19:57:17

Filtering Strings

Time of First Successful Submission: 2026-05-12 19:58:54

GCA CTF

11 / 104 9579 / 45680

Using the Terminal

Time of First Successful Submission: 2026-04-24 06:41:16

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-24 06:43:34

Using the GUI Desktop

Time of First Successful Submission: 2026-04-24 06:45:28

Pasting into the Desktop

Time of First Successful Submission: 2026-04-24 06:49:49

Connecting over SSH

Time of First Successful Submission: 2026-04-24 06:48:38

Restarting Challenges

Time of First Successful Submission: 2026-04-24 06:52:16

Challenge Programs

Time of First Successful Submission: 2026-04-24 11:31:17

The Flag File

Time of First Successful Submission: 2026-04-24 11:32:47

Using Privileged Mode

Time of First Successful Submission: 2026-04-24 11:40:58

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-24 11:44:46

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-24 11:46:18