moh_laoshi

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Kenya

Intro to Programming Languages

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Lecture 1.1. Course Environment

Time of First Successful Submission: 2026-05-01 18:32:59

Lab 1.1 - Start Terminal

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Lecture 1.2. Linux Shells

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Lecture 1.3. Linux File System

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Commands

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Command Arguments

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Command History

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The Root Path

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Absolute Paths

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Changing position

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Changing to an Absolute Path

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Relative Paths

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Cat

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Ls

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Ls All

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Find

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Piping Echo

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Piping Stdout

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Piping Stdin

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Start Here

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Using the Terminal

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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

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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

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Redirecting Script Output

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Executable Shell Scripts

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Understanding Shebangs

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Scripting with Arguments

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Scripting with Conditionals

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Scripting with Default Cases

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Scripting with Multiple Conditions

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Reading Shell Scripts

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Launching Screen

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Detaching and Attaching

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Finding Sessions

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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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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

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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

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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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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

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Debugging Programs

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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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Playing With Programs

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What's the password?

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... and again!

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Newline Troubles

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Reasoning about files

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Specifying Filenames

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Binary and Hex Encoding

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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

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HTTP Metadata

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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)

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HTTP Host Header (curl)

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HTTP Host Header (netcat)

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URL Encoding (netcat)

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HTTP GET Parameters

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Multiple HTTP Parameters (netcat)

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Multiple HTTP Parameters (curl)

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HTTP Forms

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HTTP Forms (curl)

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HTTP Forms (netcat)

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HTTP Forms (python)

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HTTP Forms Without Forms

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Multiple Form Fields (curl)

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Multiple Form Fields (netcat)

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HTTP Redirects (netcat)

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HTTP Redirects (curl)

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HTTP Redirects (python)

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HTTP Cookies (curl)

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HTTP Cookies (netcat)

Time of First Successful Submission: 2026-04-21 11:44:05

HTTP Cookies (python)

Time of First Successful Submission: 2026-04-21 11:57:10

Server State (python)

Time of First Successful Submission: 2026-04-21 12:34:33

Listening Web

Time of First Successful Submission: 2026-04-21 13:21:46

Speaking Redirects

Time of First Successful Submission: 2026-04-21 18:06:11

JavaScript Redirects

Time of First Successful Submission: 2026-04-21 18:45:04

Including JavaScript

Time of First Successful Submission: 2026-04-22 17:57:11

HTTP (javascript)

Time of First Successful Submission: 2026-04-22 18:47:21

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-04-23 12:36:41

HTTP Forms (javascript)

Time of First Successful Submission: 2026-04-23 13:28:46

cat

Time of First Successful Submission: 2026-04-23 18:06:23

more

Time of First Successful Submission: 2026-04-23 18:08:40

less

Time of First Successful Submission: 2026-04-23 18:11:25

tail

Time of First Successful Submission: 2026-04-23 18:13:05

head

Time of First Successful Submission: 2026-04-23 18:14:57

sort

Time of First Successful Submission: 2026-04-23 18:21:50

vim

Time of First Successful Submission: 2026-04-23 18:24:17

emacs

Time of First Successful Submission: 2026-04-23 18:26:34

nano

Time of First Successful Submission: 2026-04-23 18:28:18

rev

Time of First Successful Submission: 2026-04-23 18:42:01

od

Time of First Successful Submission: 2026-04-24 13:56:52

hd

Time of First Successful Submission: 2026-04-24 17:38:54

xxd

Time of First Successful Submission: 2026-04-24 17:52:51

base32

Time of First Successful Submission: 2026-04-24 18:19:06

base64

Time of First Successful Submission: 2026-04-24 18:27:58

split

Time of First Successful Submission: 2026-04-24 19:11:16

gzip

Time of First Successful Submission: 2026-04-25 12:52:25

bzip2

Time of First Successful Submission: 2026-04-25 13:03:24

zip

Time of First Successful Submission: 2026-04-25 13:21:39

tar

Time of First Successful Submission: 2026-04-25 14:12:25

ar

Time of First Successful Submission: 2026-04-25 18:11:28

cpio

Time of First Successful Submission: 2026-04-27 13:12:50

genisoimage

Time of First Successful Submission: 2026-04-27 13:22:24

env

Time of First Successful Submission: 2026-04-27 13:29:02

find

Time of First Successful Submission: 2026-04-27 15:32:36

make

Time of First Successful Submission: 2026-04-27 15:59:42

nice

Time of First Successful Submission: 2026-04-27 16:07:18

timeout

Time of First Successful Submission: 2026-04-27 16:16:05

stdbuf

Time of First Successful Submission: 2026-04-27 16:18:55

setarch

Time of First Successful Submission: 2026-04-27 16:55:03

watch

Time of First Successful Submission: 2026-04-27 18:47:19

socat

Time of First Successful Submission: 2026-04-27 18:53:33

whiptail

Time of First Successful Submission: 2026-04-27 19:01:05

awk

Time of First Successful Submission: 2026-04-28 12:16:06

sed

Time of First Successful Submission: 2026-04-28 12:27:31

ed

Time of First Successful Submission: 2026-04-28 12:36:38

chown

Time of First Successful Submission: 2026-04-28 12:44:17

chmod

Time of First Successful Submission: 2026-04-28 12:47:46

cp

Time of First Successful Submission: 2026-04-28 13:01:26

mv

Time of First Successful Submission: 2026-04-29 14:55:09

perl

Time of First Successful Submission: 2026-04-29 15:02:48

python

Time of First Successful Submission: 2026-04-29 15:19:53

ruby

Time of First Successful Submission: 2026-04-29 18:06:44

bash

Time of First Successful Submission: 2026-04-29 18:20:56

date

Time of First Successful Submission: 2026-04-29 18:26:05

dmesg

Time of First Successful Submission: 2026-04-29 18:43:15

wc

Time of First Successful Submission: 2026-04-29 18:47:53

gcc

Time of First Successful Submission: 2026-04-29 18:53:30

as

Time of First Successful Submission: 2026-04-29 18:56:57

wget

Time of First Successful Submission: 2026-04-29 19:16:44

ssh-keygen

Time of First Successful Submission: 2026-04-30 12:29:23

SQL Queries

Time of First Successful Submission: 2026-04-30 18:04:24

Filtering SQL

Time of First Successful Submission: 2026-04-30 18:14:13

Choosing Columns

Time of First Successful Submission: 2026-04-30 18:21:07

Exclusionary Filtering

Time of First Successful Submission: 2026-04-30 18:32:20

Filtering Strings

Time of First Successful Submission: 2026-04-30 18:38:57

Filtering on Expressions

Time of First Successful Submission: 2026-04-30 18:44:52

SELECTing Expressions

Time of First Successful Submission: 2026-05-01 14:04:43

Composite Conditions

Time of First Successful Submission: 2026-05-01 14:15:08

Reaching Your LIMITs

Time of First Successful Submission: 2026-05-01 14:21:42

Querying Metadata

Time of First Successful Submission: 2026-05-01 14:37:36


GCA CTF

12 / 104 1631 / 45028


Using the Terminal

Time of First Successful Submission: 2026-01-25 16:38:46

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-25 16:22:04

Using the GUI Desktop

Time of First Successful Submission: 2026-01-25 16:27:26

Pasting into the Desktop

Time of First Successful Submission: 2026-01-25 16:36:40

Connecting over SSH

Time of First Successful Submission: 2026-01-26 12:14:46

Restarting Challenges

Time of First Successful Submission: 2026-01-26 12:23:57

Getting Help

Time of First Successful Submission: 2026-01-26 12:28:52

Challenge Programs

Time of First Successful Submission: 2026-02-21 13:35:26

The Flag File

Time of First Successful Submission: 2026-02-22 12:21:15

Using Privileged Mode

Time of First Successful Submission: 2026-02-22 12:33:29

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-22 12:42:56

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-22 12:44:34