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Intro to Programming Languages

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Lecture 1.1. Course Environment

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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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P1.0 Level 1 Open /flag in VSCode

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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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P1.0 Level 5 read

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Cat

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Ls

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Ls All

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P1.0 Level 2 list dir

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Find

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P1.0 Level 3 change dir

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P1.0 Level 4 move

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P1.0 Level 6 grep

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P1.0 Level 7 execute

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Piping Echo

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Piping Stdout

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Piping Stdin

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The Art of the Shell

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The Transient Path

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Ferocious Functionality

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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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Arizona CTF 2025

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Hijack Me!

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Content Injection

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Teacher Login

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Teacher Login 2

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Teacher Login 3

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Teacher Login 4

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Teacher Login 5

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Teacher Login 6

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Teacher Login 7

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Class Cancellation

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Class Cancellation 2

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Class Cancellation 3

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DOS Dojo

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cat.exe (type)

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Fuzz Dojo

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Consent

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GCA CTF

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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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Connecting over SSH

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Restarting Challenges

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Getting Help

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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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Running Commands

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Move through the Linux filesystem.

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Create and delete files.

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Move, copy, and rename files.

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Display file contents in the terminal.

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Privilege Escalation

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aa-exec

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ab

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agetty

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alpine

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ar

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arj

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arp

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as

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ascii-xfr

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ash

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atobm

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awk

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base32

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base64

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basenc

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basez

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bash

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batcat

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bridge

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busybox

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bzip2

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capsh

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cat

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chgrp

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chmod

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chown

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chroot

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curl

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cut

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dash

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diff

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env

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grep

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head

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hexdump

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highlight

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ksh

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less

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more

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rev

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strace

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su

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uuencode

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varnishncsa

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view

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vim

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w3m

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watch

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wc

Time of First Successful Submission: 2026-03-16 03:01:24

wget

Time of First Successful Submission: 2026-03-16 02:59:15

whiptail

Time of First Successful Submission: 2026-03-16 02:56:32

xargs

Time of First Successful Submission: 2026-03-16 02:53:38

xdotool

Time of First Successful Submission: 2026-03-16 02:51:52

xmodmap

Time of First Successful Submission: 2026-03-16 02:50:53

xmore

Time of First Successful Submission: 2026-03-16 02:48:03

xxd

Time of First Successful Submission: 2026-03-16 02:46:57

xz

Time of First Successful Submission: 2026-03-16 02:44:15

yash

Time of First Successful Submission: 2026-03-16 02:39:34

zsh

Time of First Successful Submission: 2026-03-16 02:38:45

zsoelim

Time of First Successful Submission: 2026-03-16 02:38:18