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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-03-29 05:10:07

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

Time of First Successful Submission: 2026-03-29 06:03:50

Changing to an Absolute Path

Time of First Successful Submission: 2026-03-29 06:06:28

Relative Paths

Time of First Successful Submission: 2026-03-29 06:14:38

Cat

Time of First Successful Submission: 2026-03-29 12:18:40

Ls

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Ls All

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Find

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Piping Echo

Time of First Successful Submission: 2026-04-19 09:32:45

Piping Stdout

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Piping Stdin

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Intro to Cybersecurity

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Path Traversal 1

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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

Time of First Successful Submission: 2026-03-29 05:42:58

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

Time of First Successful Submission: 2026-03-29 05:10:07

Intro to Arguments

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Command History

Time of First Successful Submission: 2026-03-29 05:14:13

The Root

Time of First Successful Submission: 2026-03-29 05:56:36

Program and absolute paths

Time of First Successful Submission: 2026-03-29 05:59:57

Position thy self

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Position elsewhere

Time of First Successful Submission: 2026-03-29 06:06:28

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: 2026-03-29 12:16:59

cat: not the pet, but the command!

Time of First Successful Submission: 2026-03-29 12:18:40

catting absolute paths

Time of First Successful Submission: 2026-03-29 12:19:30

more catting practice

Time of First Successful Submission: 2026-03-29 12:22:08

grepping for a needle in a haystack

Time of First Successful Submission: 2026-03-29 12:23:36

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: 2026-03-29 12:46:02

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: 2026-03-30 07:38:29

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

Time of First Successful Submission: 2026-04-20 03:03:35

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

Time of First Successful Submission: 2026-04-20 06:59:10

Executable Files

Time of First Successful Submission: 2026-04-20 06:59:43

Permission Tweaking Practice

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Permissions Setting Practice

Time of First Successful Submission: 2026-04-20 07:14:04

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

Time of First Successful Submission: 2026-04-21 02:27:55

Redirecting Script Output

Time of First Successful Submission: 2026-04-21 02:55:57

Executable Shell Scripts

Time of First Successful Submission: 2026-04-21 02:53:25

Understanding Shebangs

Time of First Successful Submission: 2026-04-21 03:00:29

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: 2026-04-21 03:09:53

Reading Shell Scripts

Time of First Successful Submission: 2026-04-21 03:11:13

Launching Screen

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Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-04-21 03:18:42

Switching Windows

Time of First Successful Submission: 2026-04-21 03:20:28

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-21 03:21:41

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-21 03:23:39

The PATH Variable

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Setting PATH

Time of First Successful Submission: 2026-04-21 04:59:12

Finding Commands

Time of First Successful Submission: 2026-04-21 05:01:12

Adding Commands

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Hijacking Commands

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Bashrc Backdoor

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Sniffing Input

Time of First Successful Submission: 2026-04-21 06:23:52

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: 2026-04-21 12:12:55

Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-04-21 12:28:50

More Loading Practice

Time of First Successful Submission: 2026-04-21 12:30:28

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

Time of First Successful Submission: 2026-04-22 13:51:32

Examining Memory

Time of First Successful Submission: 2026-04-22 13:56:04

Examining Stack Pointers

Time of First Successful Submission: 2026-04-22 13:59:53

Cooperative Debugging

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Writing Output

Time of First Successful Submission: 2026-04-23 07:25:37

Chaining Syscalls

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Writing Strings

Time of First Successful Submission: 2026-04-23 07:29:11

Reading Data

Time of First Successful Submission: 2026-04-23 07:43:49

Opening Files

Time of First Successful Submission: 2026-04-23 07:52:22

Hardcoding the Filename

Time of First Successful Submission: 2026-04-23 07:57:52

Comparing Values

Time of First Successful Submission: 2026-04-23 09:59:06

Comparing Characters

Time of First Successful Submission: 2026-04-23 10:03:15

Conditional Control Flow

Time of First Successful Submission: 2026-04-23 10:13:00

Comparing Strings

Time of First Successful Submission: 2026-04-23 10:15:15

Reverse the Password

Time of First Successful Submission: 2026-04-23 10:20:18

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

Time of First Successful Submission: 2026-04-25 10:52:09

Inspecting Registers

Time of First Successful Submission: 2026-04-25 10:54:14

Examining Memory

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Setting Breakpoints

Time of First Successful Submission: 2026-04-25 11:22:12

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?

Time of First Successful Submission: 2026-04-26 09:04:58

... and again!

Time of First Successful Submission: 2026-04-26 09:05:41

Newline Troubles

Time of First Successful Submission: 2026-04-26 09:09:14

Reasoning about files

Time of First Successful Submission: 2026-04-26 09:10:21

Specifying Filenames

Time of First Successful Submission: 2026-04-27 05:39:49

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)

Time of First Successful Submission: 2026-04-29 01:56:01

HTTP (curl)

Time of First Successful Submission: 2026-04-29 01:57:49

HTTP (python)

Time of First Successful Submission: 2026-04-29 02:10:37

HTTP Host Header (python)

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

HTTP Host Header (curl)

Time of First Successful Submission: 2026-04-29 02:22:16

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)

Time of First Successful Submission: 2026-04-29 03:37:28

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)

Time of First Successful Submission: 2026-04-29 08:00:13

HTTP Redirects (netcat)

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HTTP Redirects (curl)

Time of First Successful Submission: 2026-04-29 08:19:21

HTTP Redirects (python)

Time of First Successful Submission: 2026-04-29 08:30:02

HTTP Cookies (curl)

Time of First Successful Submission: 2026-04-29 09:33:17

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-04-29 09:50:00

HTTP Cookies (python)

Time of First Successful Submission: 2026-04-29 09:53:59

Server State (python)

Time of First Successful Submission: 2026-04-29 09:55:49

Listening Web

Time of First Successful Submission: 2026-04-29 10:01:38

Speaking Redirects

Time of First Successful Submission: 2026-04-29 10:21:19

JavaScript Redirects

Time of First Successful Submission: 2026-04-29 11:30:52

Including JavaScript

Time of First Successful Submission: 2026-04-29 11:35:20

HTTP (javascript)

Time of First Successful Submission: 2026-04-29 11:41:20

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-04-29 11:44:54

HTTP Forms (javascript)

Time of First Successful Submission: 2026-04-29 11:47:06

cat

Time of First Successful Submission: 2026-04-30 11:03:39

more

Time of First Successful Submission: 2026-04-30 11:04:10

less

Time of First Successful Submission: 2026-04-30 11:04:35

tail

Time of First Successful Submission: 2026-04-30 11:04:58

head

Time of First Successful Submission: 2026-04-30 11:05:15

sort

Time of First Successful Submission: 2026-04-30 11:05:55

vim

Time of First Successful Submission: 2026-04-30 11:06:13

emacs

Time of First Successful Submission: 2026-04-30 11:06:44

nano

Time of First Successful Submission: 2026-04-30 11:07:32

rev

Time of First Successful Submission: 2026-04-30 11:11:22

od

Time of First Successful Submission: 2026-04-30 11:13:50

hd

Time of First Successful Submission: 2026-04-30 11:16:22

xxd

Time of First Successful Submission: 2026-04-30 11:18:14

base32

Time of First Successful Submission: 2026-04-30 11:19:19

base64

Time of First Successful Submission: 2026-04-30 11:19:57

split

Time of First Successful Submission: 2026-04-30 11:22:59

gzip

Time of First Successful Submission: 2026-04-30 11:29:10

bzip2

Time of First Successful Submission: 2026-04-30 11:29:39

zip

Time of First Successful Submission: 2026-04-30 11:30:36

tar

Time of First Successful Submission: 2026-04-30 11:30:58

ar

Time of First Successful Submission: 2026-04-30 11:31:23

cpio

Time of First Successful Submission: 2026-04-30 11:31:50

genisoimage

Time of First Successful Submission: 2026-04-30 11:32:11

env

Time of First Successful Submission: 2026-05-01 05:39:06

find

Time of First Successful Submission: 2026-05-01 05:39:48

make

Time of First Successful Submission: 2026-05-01 05:41:18

nice

Time of First Successful Submission: 2026-05-01 05:42:33

timeout

Time of First Successful Submission: 2026-05-01 05:43:25

stdbuf

Time of First Successful Submission: 2026-05-01 05:43:50

setarch

Time of First Successful Submission: 2026-05-01 05:44:18

watch

Time of First Successful Submission: 2026-05-01 05:44:32

socat

Time of First Successful Submission: 2026-05-01 05:45:41

whiptail

Time of First Successful Submission: 2026-05-01 05:48:44

awk

Time of First Successful Submission: 2026-05-01 05:49:25

sed

Time of First Successful Submission: 2026-05-01 05:50:23

ed

Time of First Successful Submission: 2026-05-01 05:51:02

chown

Time of First Successful Submission: 2026-05-01 06:29:33

chmod

Time of First Successful Submission: 2026-05-01 06:30:11

cp

Time of First Successful Submission: 2026-05-01 13:27:34

mv

Time of First Successful Submission: 2026-05-05 10:41:20

perl

Time of First Successful Submission: 2026-05-02 04:39:13

python

Time of First Successful Submission: 2026-05-02 04:58:07

ruby

Time of First Successful Submission: 2026-05-02 05:01:03

bash

Time of First Successful Submission: 2026-05-02 05:02:52

date

Time of First Successful Submission: 2026-05-02 05:03:59

dmesg

Time of First Successful Submission: 2026-05-02 05:04:46

wc

Time of First Successful Submission: 2026-05-02 05:05:43

gcc

Time of First Successful Submission: 2026-05-03 13:15:37

as

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

wget

Time of First Successful Submission: 2026-05-02 05:11:10

ssh-keygen

Time of First Successful Submission: 2026-05-05 09:48:18

SQL Queries

Time of First Successful Submission: 2026-05-04 13:56:28

Filtering SQL

Time of First Successful Submission: 2026-05-04 14:04:39

Choosing Columns

Time of First Successful Submission: 2026-05-05 10:45:25

Exclusionary Filtering

Time of First Successful Submission: 2026-05-05 10:48:28

Filtering Strings

Time of First Successful Submission: 2026-05-05 10:49:35

Filtering on Expressions

Time of First Successful Submission: 2026-05-05 10:51:55

SELECTing Expressions

Time of First Successful Submission: 2026-05-05 11:06:44

Composite Conditions

Time of First Successful Submission: 2026-05-05 11:10:58

Reaching Your LIMITs

Time of First Successful Submission: 2026-05-05 11:12:49

Querying Metadata

Time of First Successful Submission: 2026-05-05 11:18:07

GCA CTF

10 / 104 20780 / 45936

Using the Terminal

Time of First Successful Submission: 2026-03-29 04:36:03

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-29 04:42:17

Using the GUI Desktop

Time of First Successful Submission: 2026-03-29 04:49:27

Pasting into the Desktop

Time of First Successful Submission: 2026-03-29 04:51:41

Restarting Challenges

Time of First Successful Submission: 2026-03-29 05:04:42

Challenge Programs

Time of First Successful Submission: 2026-03-29 05:08:24

The Flag File

Time of First Successful Submission: 2026-03-29 05:34:29

Using Privileged Mode

Time of First Successful Submission: 2026-03-29 05:42:58

Persistent Home Directories - One

Time of First Successful Submission: 2026-03-29 05:50:50

Persistent Home Directories - Two

Time of First Successful Submission: 2026-03-29 05:52:31