Zyxen

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-05-29 10:46:28

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: 2026-06-02 11:28:25

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

Time of First Successful Submission: 2026-05-29 12:59:56

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

Time of First Successful Submission: 2026-05-29 15:18:46

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

Time of First Successful Submission: 2026-05-30 19:11:57

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

Time of First Successful Submission: 2026-06-02 11:28:25

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: 2026-06-03 16:39:25

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: 2026-06-03 20:52:24

Understanding Shebangs

Time of First Successful Submission: 2026-06-03 21:05:12

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

Time of First Successful Submission: 2026-06-03 23:31:55

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

Time of First Successful Submission: 2026-06-11 14:14:48

More Loading Practice

Time of First Successful Submission: 2026-06-11 14:16:29

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

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Mixed Conversions

Time of First Successful Submission: 2026-06-11 22:09:27

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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Setting Register Values

Time of First Successful Submission: 2026-07-13 11:49:33

Popping Stack Values

Time of First Successful Submission: 2026-06-12 00:00:23

Examining Memory

Time of First Successful Submission: 2026-06-12 00:05:49

Examining Stack Pointers

Time of First Successful Submission: 2026-06-12 00:11:11

Cooperative Debugging

Time of First Successful Submission: 2026-06-12 00:22:43

Running with Arguments

Time of First Successful Submission: 2026-06-12 00:24:45

Redirecting Input in GDB

Time of First Successful Submission: 2026-06-27 17:50:47

Writing Output

Time of First Successful Submission: 2026-06-12 20:51:31

Chaining Syscalls

Time of First Successful Submission: 2026-06-12 21:04:18

Writing Strings

Time of First Successful Submission: 2026-06-12 21:05:28

Reading Data

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Reading Exactly

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Opening Files

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Hardcoding the Filename

Time of First Successful Submission: 2026-06-12 21:49:55

RIP-Relative Strings

Time of First Successful Submission: 2026-06-13 13:39:42

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

Time of First Successful Submission: 2026-06-14 16:08:49

Conditionals Without Conditionals

Time of First Successful Submission: 2026-06-14 17:24:58

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

Time of First Successful Submission: 2026-06-17 01:31:16

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

Time of First Successful Submission: 2026-06-23 00:33:43

String Markers

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Hex Byte Escapes

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Debugging Programs

Time of First Successful Submission: 2026-06-29 16:05:27

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: 2026-07-05 18:47:35

... and again!

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Newline Troubles

Time of First Successful Submission: 2026-07-05 19:08:25

Reasoning about files

Time of First Successful Submission: 2026-07-05 19:19:10

Specifying Filenames

Time of First Successful Submission: 2026-07-05 19:21:08

Binary and Hex Encoding

Time of First Successful Submission: 2026-07-05 20:18:54

More Hex

Time of First Successful Submission: 2026-07-05 20:30:12

Decoding Hex

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Decoding Practice

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Encoding Practice

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Hex-encoding ASCII

Time of First Successful Submission: 2026-07-06 00:54:36

Nested Encoding

Time of First Successful Submission: 2026-07-06 12:46:59

Hex-encoding UTF-8

Time of First Successful Submission: 2026-07-06 13:22:35

UTF Mixups

Time of First Successful Submission: 2026-07-06 13:01:53

Modifying Encoded Data

Time of First Successful Submission: 2026-07-06 13:36:45

Decoding Base64

Time of First Successful Submission: 2026-07-06 15:50:25

Encoding Base64

Time of First Successful Submission: 2026-07-06 16:45:51

Dealing with Obfuscation

Time of First Successful Submission: 2026-07-06 17:00:28

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-07-06 17:23:04

Your First HTTP Request

Time of First Successful Submission: 2026-07-08 20:23:17

Reading Flask

Time of First Successful Submission: 2026-07-08 20:25:47

Commented Data

Time of First Successful Submission: 2026-07-08 20:33:43

HTTP Metadata

Time of First Successful Submission: 2026-07-08 20:44:14

HTTP (netcat)

Time of First Successful Submission: 2026-07-08 21:40:09

HTTP Paths (netcat)

Time of First Successful Submission: 2026-07-08 21:53:50

HTTP (curl)

Time of First Successful Submission: 2026-07-08 21:57:41

HTTP (python)

Time of First Successful Submission: 2026-07-08 22:22:58

HTTP Host Header (python)

Time of First Successful Submission: 2026-07-08 22:28:52

HTTP Host Header (curl)

Time of First Successful Submission: 2026-07-08 22:30:51

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-07-08 22:32:52

URL Encoding (netcat)

Time of First Successful Submission: 2026-07-08 22:35:10

HTTP GET Parameters

Time of First Successful Submission: 2026-07-09 10:08:20

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-07-09 10:33:18

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-07-09 10:36:51

HTTP Forms

Time of First Successful Submission: 2026-07-09 10:56:35

HTTP Forms (curl)

Time of First Successful Submission: 2026-07-09 11:00:05

HTTP Forms (netcat)

Time of First Successful Submission: 2026-07-09 11:45:52

HTTP Forms (python)

Time of First Successful Submission: 2026-07-09 12:26:36

HTTP Forms Without Forms

Time of First Successful Submission: 2026-07-12 10:17:45

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-07-12 10:21:56

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-07-12 11:18:29

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-07-12 11:28:34

HTTP Redirects (curl)

Time of First Successful Submission: 2026-07-12 11:38:02

HTTP Redirects (python)

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

HTTP Cookies (curl)

Time of First Successful Submission: 2026-07-12 15:24:56

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-07-12 16:05:48

HTTP Cookies (python)

Time of First Successful Submission: 2026-07-12 16:23:19

Server State (python)

Time of First Successful Submission: 2026-07-12 16:54:16

Listening Web

Time of First Successful Submission: 2026-07-12 17:20:30

Speaking Redirects

Time of First Successful Submission: 2026-07-12 17:45:05

JavaScript Redirects

Time of First Successful Submission: 2026-07-13 00:11:38

Including JavaScript

Time of First Successful Submission: 2026-07-13 00:50:12

HTTP (javascript)

Time of First Successful Submission: 2026-07-13 10:36:08

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-07-13 11:08:31

HTTP Forms (javascript)

Time of First Successful Submission: 2026-07-13 11:34:35

cat

Time of First Successful Submission: 2026-07-23 14:57:28

more

Time of First Successful Submission: 2026-07-23 14:57:50

less

Time of First Successful Submission: 2026-07-23 14:58:20

tail

Time of First Successful Submission: 2026-07-23 14:58:48

head

Time of First Successful Submission: 2026-07-23 14:59:08

sort

Time of First Successful Submission: 2026-07-23 15:01:11

vim

Time of First Successful Submission: 2026-07-23 15:12:31

emacs

Time of First Successful Submission: 2026-07-23 15:19:28

nano

Time of First Successful Submission: 2026-07-23 15:21:23

rev

Time of First Successful Submission: 2026-07-23 15:22:39

od

Time of First Successful Submission: 2026-07-23 15:53:40

hd

Time of First Successful Submission: 2026-07-23 15:59:00

xxd

Time of First Successful Submission: 2026-07-23 16:01:42

base32

Time of First Successful Submission: 2026-07-23 16:02:39

base64

Time of First Successful Submission: 2026-07-23 16:04:02

split

Time of First Successful Submission: 2026-07-23 16:12:17

gzip

Time of First Successful Submission: 2026-07-23 17:05:45

bzip2

Time of First Successful Submission: 2026-07-23 17:06:27

zip

Time of First Successful Submission: 2026-07-23 17:49:12

tar

Time of First Successful Submission: 2026-07-23 19:27:23

ar

Time of First Successful Submission: 2026-07-23 20:09:58

cpio

Time of First Successful Submission: 2026-07-23 20:34:30

genisoimage

Time of First Successful Submission: 2026-07-23 20:52:16

env

Time of First Successful Submission: 2026-07-23 21:09:13

find

Time of First Successful Submission: 2026-07-23 21:23:10

make

Time of First Successful Submission: 2026-07-23 21:35:35

nice

Time of First Successful Submission: 2026-07-23 21:44:51

timeout

Time of First Successful Submission: 2026-07-23 21:45:36

stdbuf

Time of First Successful Submission: 2026-07-23 21:55:22

setarch

Time of First Successful Submission: 2026-07-23 21:58:04

watch

Time of First Successful Submission: 2026-07-23 22:34:50

socat

Time of First Successful Submission: 2026-07-23 22:42:48

whiptail

Time of First Successful Submission: 2026-07-23 23:08:37

awk

Time of First Successful Submission: 2026-07-23 23:30:39

sed

Time of First Successful Submission: 2026-07-23 23:54:06

ed

Time of First Successful Submission: 2026-07-23 23:55:40

chown

Time of First Successful Submission: 2026-07-23 23:56:16

chmod

Time of First Successful Submission: 2026-07-24 00:03:14

cp

Time of First Successful Submission: 2026-07-24 00:19:44

mv

Time of First Successful Submission: 2026-07-24 00:41:22

perl

Time of First Successful Submission: 2026-07-24 01:07:50

python

Time of First Successful Submission: 2026-07-24 01:23:58

ruby

Time of First Successful Submission: 2026-07-24 01:36:26

bash

Time of First Successful Submission: 2026-07-24 01:38:07

date

Time of First Successful Submission: 2026-07-24 01:44:26

dmesg

Time of First Successful Submission: 2026-07-24 01:46:15

wc

Time of First Successful Submission: 2026-07-24 02:07:55

gcc

Time of First Successful Submission: 2026-07-24 02:09:31

as

Time of First Successful Submission: 2026-07-24 02:10:48

wget

Time of First Successful Submission: 2026-07-24 02:28:06

ssh-keygen

Time of First Successful Submission: 2026-07-24 02:42:49

SQL Queries

Time of First Successful Submission: 2026-07-24 15:10:16

Filtering SQL

Time of First Successful Submission: 2026-07-24 15:27:15

Choosing Columns

Time of First Successful Submission: 2026-07-24 15:29:50

Exclusionary Filtering

Time of First Successful Submission: 2026-07-24 15:55:19

Filtering Strings

Time of First Successful Submission: 2026-07-24 16:06:43

Filtering on Expressions

Time of First Successful Submission: 2026-07-25 11:55:42

SELECTing Expressions

Time of First Successful Submission: 2026-07-25 12:45:07

Composite Conditions

Time of First Successful Submission: 2026-07-25 12:59:04

Reaching Your LIMITs

Time of First Successful Submission: 2026-07-25 13:12:00

Querying Metadata

Time of First Successful Submission: 2026-07-25 13:27:16

DSU Cyber Camps

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Using the Terminal

Time of First Successful Submission: 2026-05-28 14:03:13

Using the VSCode Workspace

Time of First Successful Submission: 2026-05-28 14:22:34

Using the GUI Desktop

Time of First Successful Submission: 2026-05-28 15:25:28

Pasting into the Desktop

Time of First Successful Submission: 2026-05-28 15:42:48

Connecting over SSH

Time of First Successful Submission: 2026-05-28 16:02:05

Restarting Challenges

Time of First Successful Submission: 2026-05-28 16:12:07

Challenge Programs

Time of First Successful Submission: 2026-05-28 16:25:35

The Flag File

Time of First Successful Submission: 2026-05-28 16:29:12

Using Privileged Mode

Time of First Successful Submission: 2026-05-28 16:33:19

Persistent Home Directories - One

Time of First Successful Submission: 2026-05-28 16:39:41

Persistent Home Directories - Two

Time of First Successful Submission: 2026-05-28 16:40:25

GCA CTF

11 / 104 11183 / 52350

Using the Terminal

Time of First Successful Submission: 2026-05-28 14:03:13

Using the VSCode Workspace

Time of First Successful Submission: 2026-05-28 14:22:34

Using the GUI Desktop

Time of First Successful Submission: 2026-05-28 15:25:28

Pasting into the Desktop

Time of First Successful Submission: 2026-05-28 15:42:48

Connecting over SSH

Time of First Successful Submission: 2026-05-28 16:02:05

Restarting Challenges

Time of First Successful Submission: 2026-05-28 16:12:07

Challenge Programs

Time of First Successful Submission: 2026-05-28 16:25:35

The Flag File

Time of First Successful Submission: 2026-05-28 16:29:12

Using Privileged Mode

Time of First Successful Submission: 2026-05-28 16:33:19

Persistent Home Directories - One

Time of First Successful Submission: 2026-05-28 16:39:41

Persistent Home Directories - Two

Time of First Successful Submission: 2026-05-28 16:40:25