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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-08-28 12:28:26

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: 2026-08-28 17:21:37

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: 2026-08-26 23:19:05

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

Time of First Successful Submission: 2026-08-29 20:40:34

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

Time of First Successful Submission: 2026-08-28 13:41:52

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

Time of First Successful Submission: 2026-08-29 11:57:39

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: 2026-08-29 14:17:57

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: 2026-08-29 15:21:39

Understanding Shebangs

Time of First Successful Submission: 2026-08-29 15:37:26

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

Time of First Successful Submission: 2026-08-29 15:59:41

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

Time of First Successful Submission: 2026-08-30 23:37:24

Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-08-31 16:55:35

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

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Mixed Conversions

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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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Setting Register Values

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Popping Stack Values

Time of First Successful Submission: 2026-09-01 14:59:28

Examining Memory

Time of First Successful Submission: 2026-09-01 15:01:56

Examining Stack Pointers

Time of First Successful Submission: 2026-09-01 15:06:28

Cooperative Debugging

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

Running with Arguments

Time of First Successful Submission: 2026-09-01 15:17:19

Redirecting Input in GDB

Time of First Successful Submission: 2026-09-01 15:20:07

Writing Output

Time of First Successful Submission: 2026-09-01 16:19:34

Chaining Syscalls

Time of First Successful Submission: 2026-09-01 16:24:19

Writing Strings

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Reading Data

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Reading Exactly

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Opening Files

Time of First Successful Submission: 2026-09-01 17:31:43

Hardcoding the Filename

Time of First Successful Submission: 2026-09-01 18:17:59

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

Time of First Successful Submission: 2026-09-01 22:49:18

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: 2026-09-08 14:00:42

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

14 / 116 18388 / 26022

... and again!

Time of First Successful Submission: 2026-09-09 17:00:15

Newline Troubles

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Reasoning about files

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Specifying Filenames

Time of First Successful Submission: 2026-09-09 17:11:15

Binary and Hex Encoding

Time of First Successful Submission: 2026-09-09 17:31:52

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

Time of First Successful Submission: 2026-09-09 21:25:46

Modifying Encoded Data

Time of First Successful Submission: 2026-09-09 22:20:25

DSU Cyber Camps

11 / 104 13887 / 62318

Using the Terminal

Time of First Successful Submission: 2026-08-26 23:19:05

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-26 23:22:05

Using the GUI Desktop

Time of First Successful Submission: 2026-08-26 23:24:23

Pasting into the Desktop

Time of First Successful Submission: 2026-08-26 23:26:33

Connecting over SSH

Time of First Successful Submission: 2026-08-26 23:35:14

Restarting Challenges

Time of First Successful Submission: 2026-08-26 23:29:07

Challenge Programs

Time of First Successful Submission: 2026-08-29 20:36:31

The Flag File

Time of First Successful Submission: 2026-08-29 20:38:17

Using Privileged Mode

Time of First Successful Submission: 2026-08-29 20:40:34

Persistent Home Directories - One

Time of First Successful Submission: 2026-08-29 20:44:23

Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-29 20:44:56

GCA CTF

11 / 104 13887 / 62318

Using the Terminal

Time of First Successful Submission: 2026-08-26 23:19:05

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-26 23:22:05

Using the GUI Desktop

Time of First Successful Submission: 2026-08-26 23:24:23

Pasting into the Desktop

Time of First Successful Submission: 2026-08-26 23:26:33

Connecting over SSH

Time of First Successful Submission: 2026-08-26 23:35:14

Restarting Challenges

Time of First Successful Submission: 2026-08-26 23:29:07

Challenge Programs

Time of First Successful Submission: 2026-08-29 20:36:31

The Flag File

Time of First Successful Submission: 2026-08-29 20:38:17

Using Privileged Mode

Time of First Successful Submission: 2026-08-29 20:40:34

Persistent Home Directories - One

Time of First Successful Submission: 2026-08-29 20:44:23

Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-29 20:44:56