Flyingchow

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-02-04 16:27:55

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: 2026-02-06 11:11:54

Piping Stdout

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Piping Stdin

Time of First Successful Submission: 2026-02-06 11:19:28


Intro to Cybersecurity

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Your First Overflow (easy)

Time of First Successful Submission: 2026-03-02 16:41:34

Your First Overflow (hard)

Time of First Successful Submission: 2026-03-02 16:43:24

Precision (easy)

Time of First Successful Submission: 2026-03-02 17:08:30

Precision (hard)

Time of First Successful Submission: 2026-03-02 18:08:44

Variable Control (easy)

Time of First Successful Submission: 2026-03-03 17:59:25


Start Here

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Using the Terminal

Time of First Successful Submission: 2026-02-04 15:45:49

Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

Time of First Successful Submission: 2026-02-04 15:55:09

Restarting Challenges

Time of First Successful Submission: 2026-02-04 16:20:47

Challenge Programs

Time of First Successful Submission: 2026-02-10 16:40:38

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

Time of First Successful Submission: 2026-02-10 16:46:10


Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-02-04 16:27:55

Intro to Arguments

Time of First Successful Submission: 2026-02-04 16:28:35

Command History

Time of First Successful Submission: 2026-02-04 16:29:06

The Root

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Program and absolute paths

Time of First Successful Submission: 2026-02-04 16:32:26

Position thy self

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Position elsewhere

Time of First Successful Submission: 2026-02-04 16:36:52

implicit relative paths, from /

Time of First Successful Submission: 2026-02-04 16:38:09

explicit relative paths, from /

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implicit relative path

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home sweet home

Time of First Successful Submission: 2026-02-04 16:46:48

cat: not the pet, but the command!

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catting absolute paths

Time of First Successful Submission: 2026-02-04 17:46:28

more catting practice

Time of First Successful Submission: 2026-02-04 17:47:16

grepping for a needle in a haystack

Time of First Successful Submission: 2026-02-04 17:48:32

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

Time of First Successful Submission: 2026-02-04 17:57:59

An Epic Filesystem Quest

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making directories

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finding files

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linking files

Time of First Successful Submission: 2026-02-06 09:55:57

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

Time of First Successful Submission: 2026-02-07 08:39:03

Writing to multiple programs

Time of First Successful Submission: 2026-02-07 09:17:58

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

Time of First Successful Submission: 2026-02-08 11:06:10

Using sudo

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Changing File Ownership

Time of First Successful Submission: 2026-02-08 15:25:21

Groups and Files

Time of First Successful Submission: 2026-02-08 15:31:32

Fun With Groups Names

Time of First Successful Submission: 2026-02-08 15:32:49

Changing Permissions

Time of First Successful Submission: 2026-02-08 15:37:57

Executable Files

Time of First Successful Submission: 2026-02-08 15:40:24

Permission Tweaking Practice

Time of First Successful Submission: 2026-02-08 15:52:35

Permissions Setting Practice

Time of First Successful Submission: 2026-02-08 16:01:22

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: 2026-02-08 16:26:09

Redirecting Script Output

Time of First Successful Submission: 2026-02-08 16:28:27

Executable Shell Scripts

Time of First Successful Submission: 2026-02-08 16:29:36

Understanding Shebangs

Time of First Successful Submission: 2026-02-08 16:32:27

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: 2026-02-08 16:51:03

Reading Shell Scripts

Time of First Successful Submission: 2026-02-08 16:53:19

Launching Screen

Time of First Successful Submission: 2026-02-10 10:15:44

Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-02-10 10:20:45

Switching Windows

Time of First Successful Submission: 2026-02-10 10:22:52

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-02-10 10:25:29

Switching Windows (tmux)

Time of First Successful Submission: 2026-02-10 10:27:01

The PATH Variable

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Setting PATH

Time of First Successful Submission: 2026-02-10 10:49:58

Finding Commands

Time of First Successful Submission: 2026-02-10 10:53:45

Adding Commands

Time of First Successful Submission: 2026-02-10 11:01:59

Hijacking Commands

Time of First Successful Submission: 2026-02-10 11:04:41

Bashrc Backdoor

Time of First Successful Submission: 2026-02-10 11:08:32

Sniffing Input

Time of First Successful Submission: 2026-02-10 11:33:56

Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

Time of First Successful Submission: 2026-02-10 11:56:33

Snooping on Configurations

Time of First Successful Submission: 2026-02-10 11:59:44

The Fork Bomb

Time of First Successful Submission: 2026-02-10 12:28:39

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 /

Time of First Successful Submission: 2026-02-10 12:46:55


Computing 101

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Your First Register

Time of First Successful Submission: 2026-02-16 14:18:21

Your First Syscall

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Exit Codes

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Building Executables

Time of First Successful Submission: 2026-02-16 14:32:48

Moving Between Registers

Time of First Successful Submission: 2026-02-16 14:42:41

Loading From Memory

Time of First Successful Submission: 2026-02-18 18:41:15

More Loading Practice

Time of First Successful Submission: 2026-02-18 18:45:53

Dereferencing Pointers

Time of First Successful Submission: 2026-02-19 11:31:45

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

Time of First Successful Submission: 2026-02-18 16:46:48

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

Time of First Successful Submission: 2026-02-18 17:01:28

Popping Stack Values

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Examining Memory

Time of First Successful Submission: 2026-02-18 17:27:15

Examining Stack Pointers

Time of First Successful Submission: 2026-02-18 17:33:16

Cooperative Debugging

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Writing Output

Time of First Successful Submission: 2026-02-21 10:15:47

Chaining Syscalls

Time of First Successful Submission: 2026-02-21 10:27:34

Writing Strings

Time of First Successful Submission: 2026-02-21 10:29:07

Reading Data

Time of First Successful Submission: 2026-02-21 10:54:45

Opening Files

Time of First Successful Submission: 2026-02-21 11:34:57

Hardcoding the Filename

Time of First Successful Submission: 2026-02-21 11:51:47

Comparing Values

Time of First Successful Submission: 2026-02-22 08:48:51

Comparing Characters

Time of First Successful Submission: 2026-02-22 08:56:09

Conditional Control Flow

Time of First Successful Submission: 2026-02-22 09:02:09

Comparing Strings

Time of First Successful Submission: 2026-02-22 09:15:31

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

Time of First Successful Submission: 2026-02-24 06:36:20

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

Time of First Successful Submission: 2026-03-02 14:57:55

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

Time of First Successful Submission: 2026-03-02 15:50:22

Debugging Programs

Time of First Successful Submission: 2026-02-25 17:05:25

Inspecting Registers

Time of First Successful Submission: 2026-02-25 17:07:32

Examining Memory

Time of First Successful Submission: 2026-02-25 17:25:56

Setting Breakpoints

Time of First Successful Submission: 2026-02-25 19:20:27

GDB Scripting

Time of First Successful Submission: 2026-02-26 09:05:40

Modifying Data

Time of First Successful Submission: 2026-02-26 10:16:51

Modifying Execution

Time of First Successful Submission: 2026-02-26 11:50:22

Broken Functions

Time of First Successful Submission: 2026-02-26 12:25:43


Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-02-26 12:30:59

... and again!

Time of First Successful Submission: 2026-02-26 12:31:38

Newline Troubles

Time of First Successful Submission: 2026-02-26 12:34:30

Reasoning about files

Time of First Successful Submission: 2026-02-26 12:37:01

Specifying Filenames

Time of First Successful Submission: 2026-02-26 12:38:00

Binary and Hex Encoding

Time of First Successful Submission: 2026-02-26 12:44:16

More Hex

Time of First Successful Submission: 2026-02-28 14:42:55

Decoding Hex

Time of First Successful Submission: 2026-02-28 15:27:42

Decoding Practice

Time of First Successful Submission: 2026-02-28 15:32:09

Encoding Practice

Time of First Successful Submission: 2026-02-28 15:35:57

Hex-encoding ASCII

Time of First Successful Submission: 2026-02-28 15:51:44

cat

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more

Time of First Successful Submission: 2026-02-26 17:59:01

less

Time of First Successful Submission: 2026-02-26 17:59:18

tail

Time of First Successful Submission: 2026-02-26 17:59:41

head

Time of First Successful Submission: 2026-02-26 18:00:00

sort

Time of First Successful Submission: 2026-02-26 18:00:17

vim

Time of First Successful Submission: 2026-02-26 18:00:52

emacs

Time of First Successful Submission: 2026-02-26 18:04:54

nano

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rev

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od

Time of First Successful Submission: 2026-02-26 18:11:22

hd

Time of First Successful Submission: 2026-02-26 18:12:38

xxd

Time of First Successful Submission: 2026-02-26 18:13:12

base32

Time of First Successful Submission: 2026-02-26 18:14:05

base64

Time of First Successful Submission: 2026-02-26 18:14:43

split

Time of First Successful Submission: 2026-02-26 18:18:16

gzip

Time of First Successful Submission: 2026-02-26 18:20:07

bzip2

Time of First Successful Submission: 2026-02-26 18:22:30

zip

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tar

Time of First Successful Submission: 2026-02-26 18:28:21

ar

Time of First Successful Submission: 2026-02-26 18:29:42

cpio

Time of First Successful Submission: 2026-02-26 18:30:31

genisoimage

Time of First Successful Submission: 2026-02-28 15:59:28

env

Time of First Successful Submission: 2026-02-28 16:02:11

find

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make

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nice

Time of First Successful Submission: 2026-02-28 16:06:52

timeout

Time of First Successful Submission: 2026-02-28 16:07:31

stdbuf

Time of First Successful Submission: 2026-02-28 16:08:13

setarch

Time of First Successful Submission: 2026-02-28 16:08:45

watch

Time of First Successful Submission: 2026-02-28 16:16:11

socat

Time of First Successful Submission: 2026-02-28 16:18:51

whiptail

Time of First Successful Submission: 2026-02-28 16:22:01

awk

Time of First Successful Submission: 2026-02-28 16:23:18

sed

Time of First Successful Submission: 2026-02-28 16:25:31

ed

Time of First Successful Submission: 2026-02-28 16:26:55

chown

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

chmod

Time of First Successful Submission: 2026-02-28 16:28:27

cp

Time of First Successful Submission: 2026-02-28 16:40:57

mv

Time of First Successful Submission: 2026-02-28 16:52:27

perl

Time of First Successful Submission: 2026-02-28 16:53:10

python

Time of First Successful Submission: 2026-02-28 16:55:09

ruby

Time of First Successful Submission: 2026-02-28 16:57:05

bash

Time of First Successful Submission: 2026-02-28 16:58:00

date

Time of First Successful Submission: 2026-02-28 16:58:51

dmesg

Time of First Successful Submission: 2026-02-28 16:59:26

wc

Time of First Successful Submission: 2026-02-28 17:00:02

gcc

Time of First Successful Submission: 2026-02-28 17:00:37

as

Time of First Successful Submission: 2026-02-28 17:01:31

wget

Time of First Successful Submission: 2026-03-01 15:25:34

ssh-keygen

Time of First Successful Submission: 2026-03-01 15:34:41


GCA CTF

12 / 104 1452 / 43655


Using the Terminal

Time of First Successful Submission: 2026-02-04 15:45:49

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-04 15:50:47

Using the GUI Desktop

Time of First Successful Submission: 2026-02-04 15:52:22

Pasting into the Desktop

Time of First Successful Submission: 2026-02-04 15:55:09

Connecting over SSH

Time of First Successful Submission: 2026-02-04 16:13:56

Restarting Challenges

Time of First Successful Submission: 2026-02-04 16:20:47

Getting Help

Time of First Successful Submission: 2026-02-04 16:22:55

Challenge Programs

Time of First Successful Submission: 2026-02-10 16:40:38

The Flag File

Time of First Successful Submission: 2026-02-10 16:41:34

Using Privileged Mode

Time of First Successful Submission: 2026-02-10 16:43:14

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-10 16:45:04

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-10 16:46:10