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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

Time of First Successful Submission: 2026-08-09 05:01:27

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

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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: 2026-08-11 09:18:24

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: 2026-08-18 04:05:17

Understanding Shebangs

Time of First Successful Submission: 2026-08-18 04:10:41

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)

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The PATH Variable

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Setting PATH

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Finding Commands

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Adding Commands

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Hijacking Commands

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Bashrc Backdoor

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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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Negative Numbers

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Negative Numbers (16-bit)

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Negative Numbers (32-bit)

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Encoding Negatives

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Binary and Hex Encoding

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More Hex

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Decoding Hex

Time of First Successful Submission: 2026-08-20 10:22:56

Mixed Conversions

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Disassembling Programs

Time of First Successful Submission: 2026-08-23 10:08:15

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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Setting Register Values

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Popping Stack Values

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Examining Memory

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Examining Stack Pointers

Time of First Successful Submission: 2026-08-23 23:52:01

Cooperative Debugging

Time of First Successful Submission: 2026-08-23 23:58:38

Running with Arguments

Time of First Successful Submission: 2026-08-24 00:00:24

Redirecting Input in GDB

Time of First Successful Submission: 2026-08-24 00:03:35

Writing Output

Time of First Successful Submission: 2026-08-24 06:06:30

Chaining Syscalls

Time of First Successful Submission: 2026-08-24 06:08:32

Writing Strings

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Reading Data

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Reading Exactly

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Opening Files

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Hardcoding the Filename

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RIP-Relative Strings

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Comparing Values

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Comparing Characters

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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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Recognizing Loops

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Writing Loops

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Writing From a Shared Library

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Returning a Value

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Calling Through a Pointer

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Calling Through a Pointer with an Argument

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Saving Caller-Saved Registers

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Saving Callee-Saved Registers

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Sign Extension

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Little-Endian Bytes

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Qword by Qword

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Dword by Dword

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Word by Word

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Byte by Byte

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Cracking a Struct

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Scrambled Struct

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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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Even or Odd

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Masking Bits

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Lowercase a String

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Uppercase a String

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Swap Case

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Shifting Left

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Shifting Right

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Loops on Data

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Reaching Into the Caller's Frame

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Loading Stale Stack Data

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Stealing Stale Stack Data

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Reserving Your Own Frame

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Using Your Own Frame

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Environment Variables on the Stack

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Aligning the Stack Through the Environment

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Aligning the Stack Through GDB

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Aligning the Stack Through GDB, Generalized

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A Single Digit

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Two Digits

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String to Integer

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Negative Numbers

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Where the Number Ends

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A Whole Program

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A Single Digit, Back to Text

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Divide and Remainder

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Drop the Leading Zero

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Integer to String

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Negative Numbers, Back to Text

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Sum Them All

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Addition

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Subtraction

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Multiplication

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Bitwise Operators

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Unary Operators

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Literal Output

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Newline Escapes

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Escaped Syntax

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Decimal Markers

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Multiple Decimal Markers

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String Markers

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Hex Byte Escapes

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Debugging Programs

Time of First Successful Submission: 2026-09-01 10:30:37

Inspecting Registers

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Examining Memory

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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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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

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-09-05 10:12:41

... and again!

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Newline Troubles

Time of First Successful Submission: 2026-09-05 10:16:26

Reasoning about files

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Specifying Filenames

Time of First Successful Submission: 2026-09-06 01:27:39

Binary and Hex Encoding

Time of First Successful Submission: 2026-09-06 01:40:49

More Hex

Time of First Successful Submission: 2026-09-06 01:42:48

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

Time of First Successful Submission: 2026-09-06 02:31:23

UTF Mixups

Time of First Successful Submission: 2026-09-06 02:43:01

Modifying Encoded Data

Time of First Successful Submission: 2026-09-06 05:39:08

Decoding Base64

Time of First Successful Submission: 2026-09-06 05:46:26

Encoding Base64

Time of First Successful Submission: 2026-09-06 05:47:22

Dealing with Obfuscation

Time of First Successful Submission: 2026-09-06 05:53:13

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-09-06 10:08:48

Your First HTTP Request

Time of First Successful Submission: 2026-09-07 03:16:10

Reading Flask

Time of First Successful Submission: 2026-09-07 03:17:47

Commented Data

Time of First Successful Submission: 2026-09-07 03:20:59

HTTP Metadata

Time of First Successful Submission: 2026-09-07 03:23:46

HTTP (netcat)

Time of First Successful Submission: 2026-09-07 03:39:34

HTTP Paths (netcat)

Time of First Successful Submission: 2026-09-07 04:49:27

HTTP (curl)

Time of First Successful Submission: 2026-09-07 04:51:59

HTTP (python)

Time of First Successful Submission: 2026-09-07 05:46:38

HTTP Host Header (python)

Time of First Successful Submission: 2026-09-07 06:03:40

HTTP Host Header (curl)

Time of First Successful Submission: 2026-09-07 06:11:47

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-09-07 06:17:47

URL Encoding (netcat)

Time of First Successful Submission: 2026-09-07 07:00:13

HTTP GET Parameters

Time of First Successful Submission: 2026-09-07 07:03:50

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-09-07 07:08:03

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-09-07 07:12:27

HTTP Forms

Time of First Successful Submission: 2026-09-07 07:17:17

HTTP Forms (curl)

Time of First Successful Submission: 2026-09-07 07:25:47

HTTP Forms (netcat)

Time of First Successful Submission: 2026-09-07 07:46:26

HTTP Forms (python)

Time of First Successful Submission: 2026-09-07 07:53:11

HTTP Forms Without Forms

Time of First Successful Submission: 2026-09-07 08:08:22

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-09-08 01:24:10

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-09-08 01:28:17

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-09-08 01:30:54

HTTP Redirects (curl)

Time of First Successful Submission: 2026-09-08 01:33:19

HTTP Redirects (python)

Time of First Successful Submission: 2026-09-08 01:35:34

HTTP Cookies (curl)

Time of First Successful Submission: 2026-09-08 01:49:57

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-09-08 01:53:03

HTTP Cookies (python)

Time of First Successful Submission: 2026-09-08 01:58:58

Server State (python)

Time of First Successful Submission: 2026-09-08 03:37:44

Listening Web

Time of First Successful Submission: 2026-09-08 23:27:26

Speaking Redirects

Time of First Successful Submission: 2026-09-09 02:15:50

JavaScript Redirects

Time of First Successful Submission: 2026-09-09 03:30:49

Including JavaScript

Time of First Successful Submission: 2026-09-09 03:47:14

HTTP (javascript)

Time of First Successful Submission: 2026-09-10 03:30:13

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-09-10 03:39:48

HTTP Forms (javascript)

Time of First Successful Submission: 2026-09-10 05:04:50

cat

Time of First Successful Submission: 2026-09-10 05:09:23

more

Time of First Successful Submission: 2026-09-10 05:11:48

less

Time of First Successful Submission: 2026-09-10 05:12:41

tail

Time of First Successful Submission: 2026-09-10 05:16:40

head

Time of First Successful Submission: 2026-09-10 05:17:05

sort

Time of First Successful Submission: 2026-09-10 05:18:10

vim

Time of First Successful Submission: 2026-09-10 05:18:47

emacs

Time of First Successful Submission: 2026-09-10 05:19:35

nano

Time of First Successful Submission: 2026-09-10 05:20:26

rev

Time of First Successful Submission: 2026-09-10 05:21:22

od

Time of First Successful Submission: 2026-09-10 05:36:13

hd

Time of First Successful Submission: 2026-09-10 05:37:50

xxd

Time of First Successful Submission: 2026-09-10 05:40:08

base32

Time of First Successful Submission: 2026-09-10 08:04:02

base64

Time of First Successful Submission: 2026-09-10 08:04:47

split

Time of First Successful Submission: 2026-09-10 08:10:17

gzip

Time of First Successful Submission: 2026-09-10 08:29:45

bzip2

Time of First Successful Submission: 2026-09-10 08:31:25

zip

Time of First Successful Submission: 2026-09-10 09:00:32

tar

Time of First Successful Submission: 2026-09-11 06:47:59

ar

Time of First Successful Submission: 2026-09-11 06:55:02

cpio

Time of First Successful Submission: 2026-09-11 07:06:54

genisoimage

Time of First Successful Submission: 2026-09-12 03:28:24

env

Time of First Successful Submission: 2026-09-12 03:29:42

find

Time of First Successful Submission: 2026-09-12 03:39:32

make

Time of First Successful Submission: 2026-09-12 03:55:12

nice

Time of First Successful Submission: 2026-09-12 07:46:23

timeout

Time of First Successful Submission: 2026-09-12 07:47:57

stdbuf

Time of First Successful Submission: 2026-09-12 07:49:58

setarch

Time of First Successful Submission: 2026-09-18 01:52:03

watch

Time of First Successful Submission: 2026-09-15 01:17:02

socat

Time of First Successful Submission: 2026-09-15 01:23:00

whiptail

Time of First Successful Submission: 2026-09-15 01:26:44

awk

Time of First Successful Submission: 2026-09-15 01:32:49

sed

Time of First Successful Submission: 2026-09-15 01:35:13

ed

Time of First Successful Submission: 2026-09-15 01:38:50

chown

Time of First Successful Submission: 2026-09-15 01:39:31

chmod

Time of First Successful Submission: 2026-09-15 01:39:58

cp

Time of First Successful Submission: 2026-09-15 01:51:03

mv

Time of First Successful Submission: 2026-09-18 02:01:05

perl

Time of First Successful Submission: 2026-09-16 07:22:20

python

Time of First Successful Submission: 2026-09-16 07:25:07

ruby

Time of First Successful Submission: 2026-09-16 07:27:28

bash

Time of First Successful Submission: 2026-09-18 10:30:42

date

Time of First Successful Submission: 2026-09-17 00:20:55

dmesg

Time of First Successful Submission: 2026-09-17 00:21:50

wc

Time of First Successful Submission: 2026-09-17 00:23:46

gcc

Time of First Successful Submission: 2026-09-17 00:30:08

as

Time of First Successful Submission: 2026-09-17 00:30:39

wget

Time of First Successful Submission: 2026-09-17 01:51:10

ssh-keygen

Time of First Successful Submission: 2026-09-18 06:18:01

SQL Queries

Time of First Successful Submission: 2026-09-18 06:52:33

Filtering SQL

Time of First Successful Submission: 2026-09-18 06:59:01

Choosing Columns

Time of First Successful Submission: 2026-09-18 07:01:23

Exclusionary Filtering

Time of First Successful Submission: 2026-09-18 07:02:33

Filtering Strings

Time of First Successful Submission: 2026-09-18 07:03:25

Filtering on Expressions

Time of First Successful Submission: 2026-09-18 07:06:03

SELECTing Expressions

Time of First Successful Submission: 2026-09-18 07:19:24

Composite Conditions

Time of First Successful Submission: 2026-09-18 07:21:39

Reaching Your LIMITs

Time of First Successful Submission: 2026-09-18 07:23:26

Querying Metadata

Time of First Successful Submission: 2026-09-18 07:25:08

DSU Cyber Camps

11 / 104 13656 / 65462

Using the Terminal

Time of First Successful Submission: 2026-08-08 00:08:00

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-08 00:10:36

Using the GUI Desktop

Time of First Successful Submission: 2026-08-08 00:12:26

Pasting into the Desktop

Time of First Successful Submission: 2026-08-08 00:14:14

Connecting over SSH

Time of First Successful Submission: 2026-08-08 00:25:47

Restarting Challenges

Time of First Successful Submission: 2026-08-08 00:29:37

Challenge Programs

Time of First Successful Submission: 2026-08-08 00:32:11

The Flag File

Time of First Successful Submission: 2026-08-08 01:13:24

Using Privileged Mode

Time of First Successful Submission: 2026-08-08 01:15:30

Persistent Home Directories - One

Time of First Successful Submission: 2026-08-08 01:17:18

Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-08 01:17:50

GCA CTF

11 / 104 13656 / 65462

Using the Terminal

Time of First Successful Submission: 2026-08-08 00:08:00

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-08 00:10:36

Using the GUI Desktop

Time of First Successful Submission: 2026-08-08 00:12:26

Pasting into the Desktop

Time of First Successful Submission: 2026-08-08 00:14:14

Connecting over SSH

Time of First Successful Submission: 2026-08-08 00:25:47

Restarting Challenges

Time of First Successful Submission: 2026-08-08 00:29:37

Challenge Programs

Time of First Successful Submission: 2026-08-08 00:32:11

The Flag File

Time of First Successful Submission: 2026-08-08 01:13:24

Using Privileged Mode

Time of First Successful Submission: 2026-08-08 01:15:30

Persistent Home Directories - One

Time of First Successful Submission: 2026-08-08 01:17:18

Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-08 01:17:50