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Triple Dereference

Time of First Successful Submission: 2026-01-09 18:53:12


Intro to Programming Languages

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Commands

Time of First Successful Submission: 2025-12-23 20:05:04

Command Arguments

Time of First Successful Submission: 2025-12-23 20:05:59

Command History

Time of First Successful Submission: 2025-12-23 20:06:25

The Root Path

Time of First Successful Submission: 2025-12-23 20:07:41

Absolute Paths

Time of First Successful Submission: 2025-12-23 20:13:32

Changing position

Time of First Successful Submission: 2025-12-23 20:14:32

Changing to an Absolute Path

Time of First Successful Submission: 2025-12-23 20:16:14

Relative Paths

Time of First Successful Submission: 2025-12-23 20:17:16

Cat

Time of First Successful Submission: 2025-12-23 20:23:24

Ls

Time of First Successful Submission: 2025-12-23 20:29:06

Ls All

Time of First Successful Submission: 2025-12-23 20:33:04

Find

Time of First Successful Submission: 2025-12-23 20:46:56

Piping Echo

Time of First Successful Submission: 2025-12-23 21:31:44

Piping Stdout

Time of First Successful Submission: 2025-12-23 21:32:42

Piping Stdin

Time of First Successful Submission: 2025-12-23 21:38:52


Start Here

12 / 12 521 / 43267


Using the Terminal

Time of First Successful Submission: 2025-12-25 17:34:52

Using the VSCode Workspace

Time of First Successful Submission: 2025-12-25 17:35:44

Using the GUI Desktop

Time of First Successful Submission: 2025-12-25 17:36:43

Pasting into the Desktop

Time of First Successful Submission: 2025-12-25 17:38:04

Restarting Challenges

Time of First Successful Submission: 2025-12-25 17:40:42

Challenge Programs

Time of First Successful Submission: 2025-12-25 17:43:05

The Flag File

Time of First Successful Submission: 2025-12-25 17:43:29

Using Privileged Mode

Time of First Successful Submission: 2025-12-25 17:44:34

Persistent Home Directories - One

Time of First Successful Submission: 2025-12-25 17:46:08

Persistent Home Directories - Two

Time of First Successful Submission: 2025-12-25 17:46:39


Linux Luminarium

128 / 128 1021 / 32351


Intro to Commands

Time of First Successful Submission: 2025-12-23 20:05:04

Intro to Arguments

Time of First Successful Submission: 2025-12-23 20:05:59

Command History

Time of First Successful Submission: 2025-12-23 20:06:25

The Root

Time of First Successful Submission: 2025-12-23 20:07:41

Program and absolute paths

Time of First Successful Submission: 2025-12-23 20:13:32

Position thy self

Time of First Successful Submission: 2025-12-23 20:14:32

Position elsewhere

Time of First Successful Submission: 2025-12-23 20:16:14

implicit relative paths, from /

Time of First Successful Submission: 2025-12-23 20:17:16

explicit relative paths, from /

Time of First Successful Submission: 2025-12-23 20:18:21

implicit relative path

Time of First Successful Submission: 2025-12-23 20:19:20

home sweet home

Time of First Successful Submission: 2025-12-23 20:20:53

cat: not the pet, but the command!

Time of First Successful Submission: 2025-12-23 20:23:24

catting absolute paths

Time of First Successful Submission: 2025-12-23 20:23:46

more catting practice

Time of First Successful Submission: 2025-12-23 20:26:10

grepping for a needle in a haystack

Time of First Successful Submission: 2025-12-23 20:27:03

comparing files

Time of First Successful Submission: 2025-12-23 20:28:11

listing files

Time of First Successful Submission: 2025-12-23 20:29:06

touching files

Time of First Successful Submission: 2025-12-23 20:30:05

removing files

Time of First Successful Submission: 2025-12-23 20:30:46

moving files

Time of First Successful Submission: 2025-12-23 20:31:43

copying files

Time of First Successful Submission: 2025-12-23 20:32:17

hidden files

Time of First Successful Submission: 2025-12-23 20:33:04

An Epic Filesystem Quest

Time of First Successful Submission: 2025-12-23 20:36:55

making directories

Time of First Successful Submission: 2025-12-23 20:38:42

finding files

Time of First Successful Submission: 2025-12-23 20:46:56

linking files

Time of First Successful Submission: 2025-12-23 20:58:06

Learning From Documentation

Time of First Successful Submission: 2025-12-23 20:59:35

Learning Complex Usage

Time of First Successful Submission: 2025-12-23 21:02:08

Reading Manuals

Time of First Successful Submission: 2025-12-23 21:05:50

Searching Manuals

Time of First Successful Submission: 2025-12-23 21:06:50

Searching For Manuals

Time of First Successful Submission: 2025-12-23 21:10:59

Helpful Programs

Time of First Successful Submission: 2025-12-23 21:12:15

Help for Builtins

Time of First Successful Submission: 2025-12-23 21:12:57

Matching with *

Time of First Successful Submission: 2025-12-23 21:15:16

Matching with ?

Time of First Successful Submission: 2025-12-23 21:16:11

Matching with []

Time of First Successful Submission: 2025-12-23 21:17:15

Matching paths with []

Time of First Successful Submission: 2025-12-23 21:18:06

Multiple globs

Time of First Successful Submission: 2025-12-23 21:19:32

Mixing globs

Time of First Successful Submission: 2025-12-23 21:25:10

Exclusionary globbing

Time of First Successful Submission: 2025-12-23 21:26:41

Tab completion

Time of First Successful Submission: 2025-12-23 21:28:35

Multiple options for tab completion

Time of First Successful Submission: 2025-12-23 21:29:52

Tab completion on commands

Time of First Successful Submission: 2025-12-23 21:30:15

Redirecting output

Time of First Successful Submission: 2025-12-23 21:31:44

Redirecting more output

Time of First Successful Submission: 2025-12-23 21:32:42

Appending output

Time of First Successful Submission: 2025-12-23 21:34:09

Redirecting errors

Time of First Successful Submission: 2025-12-23 21:37:32

Redirecting input

Time of First Successful Submission: 2025-12-23 21:38:52

Grepping stored results

Time of First Successful Submission: 2025-12-23 21:42:27

Grepping live output

Time of First Successful Submission: 2025-12-23 21:43:33

Grepping errors

Time of First Successful Submission: 2025-12-23 21:44:35

Filtering with grep -v

Time of First Successful Submission: 2025-12-23 21:45:38

Filtering with sed

Time of First Successful Submission: 2025-12-23 21:46:56

Duplicating piped data with tee

Time of First Successful Submission: 2025-12-23 21:50:38

Process substitution for input

Time of First Successful Submission: 2025-12-23 21:52:44

Writing to multiple programs

Time of First Successful Submission: 2025-12-23 21:55:59

Split-piping stderr and stdout

Time of First Successful Submission: 2025-12-23 22:03:55

Named pipes

Time of First Successful Submission: 2025-12-23 22:08:14

Printing Variables

Time of First Successful Submission: 2025-12-23 22:26:20

Setting Variables

Time of First Successful Submission: 2025-12-23 22:26:50

Multi-word Variables

Time of First Successful Submission: 2025-12-23 22:27:31

Exporting Variables

Time of First Successful Submission: 2025-12-23 22:30:10

Printing Exported Variables

Time of First Successful Submission: 2025-12-23 22:30:34

Storing Command Output

Time of First Successful Submission: 2025-12-23 22:32:51

Reading Input

Time of First Successful Submission: 2025-12-23 22:34:12

Reading Files

Time of First Successful Submission: 2025-12-23 22:36:05

Translating characters

Time of First Successful Submission: 2025-12-23 22:41:39

Deleting characters

Time of First Successful Submission: 2025-12-23 22:42:29

Deleting newlines

Time of First Successful Submission: 2025-12-23 22:43:41

Extracting the first lines with head

Time of First Successful Submission: 2025-12-23 22:46:06

Extracting specific sections of text

Time of First Successful Submission: 2025-12-23 22:48:06

Sorting data

Time of First Successful Submission: 2025-12-23 22:50:00

Listing Processes

Time of First Successful Submission: 2025-12-24 11:00:22

Killing Processes

Time of First Successful Submission: 2025-12-24 11:03:43

Interrupting Processes

Time of First Successful Submission: 2025-12-24 11:04:27

Killing Misbehaving Processes

Time of First Successful Submission: 2025-12-24 11:06:56

Suspending Processes

Time of First Successful Submission: 2025-12-24 11:08:59

Resuming Processes

Time of First Successful Submission: 2025-12-24 11:09:41

Backgrounding Processes

Time of First Successful Submission: 2025-12-24 11:11:48

Foregrounding Processes

Time of First Successful Submission: 2025-12-24 11:13:10

Starting Backgrounded Processes

Time of First Successful Submission: 2025-12-24 11:13:45

Process Exit Codes

Time of First Successful Submission: 2025-12-24 11:15:40

Becoming root with su

Time of First Successful Submission: 2025-12-24 11:33:06

Other users with su

Time of First Successful Submission: 2025-12-24 11:36:49

Cracking passwords

Time of First Successful Submission: 2025-12-24 11:39:34

Using sudo

Time of First Successful Submission: 2025-12-24 11:42:52

Changing File Ownership

Time of First Successful Submission: 2025-12-25 15:15:32

Groups and Files

Time of First Successful Submission: 2025-12-25 15:19:21

Fun With Groups Names

Time of First Successful Submission: 2025-12-25 15:21:30

Changing Permissions

Time of First Successful Submission: 2025-12-25 15:24:04

Executable Files

Time of First Successful Submission: 2025-12-25 15:25:16

Permission Tweaking Practice

Time of First Successful Submission: 2025-12-25 15:31:56

Permissions Setting Practice

Time of First Successful Submission: 2025-12-25 15:42:19

The SUID Bit

Time of First Successful Submission: 2025-12-25 15:44:14

Chaining with Semicolons

Time of First Successful Submission: 2025-12-25 15:45:30

Building on Success

Time of First Successful Submission: 2025-12-25 15:46:51

Handling Failure

Time of First Successful Submission: 2025-12-25 15:47:40

Your First Shell Script

Time of First Successful Submission: 2025-12-25 15:49:09

Redirecting Script Output

Time of First Successful Submission: 2025-12-25 15:51:02

Executable Shell Scripts

Time of First Successful Submission: 2025-12-25 15:52:13

Understanding Shebangs

Time of First Successful Submission: 2025-12-25 15:55:59

Scripting with Arguments

Time of First Successful Submission: 2025-12-25 16:00:59

Scripting with Conditionals

Time of First Successful Submission: 2025-12-25 16:03:14

Scripting with Default Cases

Time of First Successful Submission: 2025-12-25 16:03:56

Scripting with Multiple Conditions

Time of First Successful Submission: 2025-12-25 16:05:32

Reading Shell Scripts

Time of First Successful Submission: 2025-12-25 16:06:26

Launching Screen

Time of First Successful Submission: 2025-12-25 16:07:44

Detaching and Attaching

Time of First Successful Submission: 2025-12-25 16:09:08

Finding Sessions

Time of First Successful Submission: 2025-12-25 16:10:25

Switching Windows

Time of First Successful Submission: 2025-12-25 16:11:12

Detaching and Attaching (tmux)

Time of First Successful Submission: 2025-12-25 16:12:14

Switching Windows (tmux)

Time of First Successful Submission: 2025-12-25 16:13:48

The PATH Variable

Time of First Successful Submission: 2025-12-25 16:16:53

Setting PATH

Time of First Successful Submission: 2025-12-25 16:18:28

Finding Commands

Time of First Successful Submission: 2025-12-25 16:19:47

Adding Commands

Time of First Successful Submission: 2025-12-25 16:24:41

Hijacking Commands

Time of First Successful Submission: 2025-12-25 16:28:53

Bashrc Backdoor

Time of First Successful Submission: 2025-12-25 16:31:19

Sniffing Input

Time of First Successful Submission: 2025-12-25 16:38:02

Overshared Directories

Time of First Successful Submission: 2025-12-25 16:41:36

Tricky Linking

Time of First Successful Submission: 2025-12-25 16:46:27

Sniffing Process Arguments

Time of First Successful Submission: 2025-12-25 16:47:54

Snooping on Configurations

Time of First Successful Submission: 2025-12-25 16:49:28

The Fork Bomb

Time of First Successful Submission: 2025-12-25 17:06:59

Disk-Space Doomsday

Time of First Successful Submission: 2025-12-25 17:10:14

rm -rf /

Time of First Successful Submission: 2025-12-25 17:13:02

Life after rm -rf /

Time of First Successful Submission: 2025-12-25 17:16:33

Finding meaning after rm -rf /

Time of First Successful Submission: 2025-12-25 17:20:14


Computing 101

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Your First Register

Time of First Successful Submission: 2026-01-09 10:49:39

Your First Syscall

Time of First Successful Submission: 2026-01-09 11:07:50

Exit Codes

Time of First Successful Submission: 2026-01-09 11:10:53

Building Executables

Time of First Successful Submission: 2026-01-09 11:21:43

Moving Between Registers

Time of First Successful Submission: 2026-01-09 11:29:30

Loading From Memory

Time of First Successful Submission: 2026-01-09 11:44:57

More Loading Practice

Time of First Successful Submission: 2026-01-09 11:46:52

Dereferencing Pointers

Time of First Successful Submission: 2026-01-09 11:51:10

Dereferencing Yourself

Time of First Successful Submission: 2026-01-09 11:53:15

Dereferencing with Offsets

Time of First Successful Submission: 2026-01-09 11:55:12

Stored Addresses

Time of First Successful Submission: 2026-01-09 11:57:51

Double Dereference

Time of First Successful Submission: 2026-01-09 12:00:21

Tracing Syscalls

Time of First Successful Submission: 2026-01-09 11:35:23

Starting GDB

Time of First Successful Submission: 2026-01-09 11:37:08

Starting Programs in GDB

Time of First Successful Submission: 2026-01-09 11:38:11

Writing Output

Time of First Successful Submission: 2026-01-11 13:04:13

Chaining Syscalls

Time of First Successful Submission: 2026-01-11 13:06:09

Writing Strings

Time of First Successful Submission: 2026-01-11 13:07:43

Reading Data

Time of First Successful Submission: 2026-01-11 13:14:05

set-register

Time of First Successful Submission: 2026-01-11 19:56:08

set-multiple-registers

Time of First Successful Submission: 2026-01-11 20:01:28

add-to-register

Time of First Successful Submission: 2026-01-11 20:03:07

linear-equation-registers

Time of First Successful Submission: 2026-01-11 20:22:37

integer-division

Time of First Successful Submission: 2026-01-11 20:29:05

modulo-operation

Time of First Successful Submission: 2026-01-11 20:31:45

set-upper-byte

Time of First Successful Submission: 2026-01-11 20:34:41

efficient-modulo

Time of First Successful Submission: 2026-01-11 20:42:08

byte-extraction

Time of First Successful Submission: 2026-01-11 20:49:59

bitwise-and

Time of First Successful Submission: 2026-01-11 20:54:48

check-even

Time of First Successful Submission: 2026-01-11 21:02:25

memory-read

Time of First Successful Submission: 2026-01-11 21:05:49

memory-write

Time of First Successful Submission: 2026-01-11 21:07:01

memory-increment

Time of First Successful Submission: 2026-01-11 21:10:12

byte-access

Time of First Successful Submission: 2026-01-11 21:14:37

memory-size-access

Time of First Successful Submission: 2026-01-15 14:47:36

little-endian-write

Time of First Successful Submission: 2026-01-15 15:06:02

memory-sum

Time of First Successful Submission: 2026-01-15 15:18:51

stack-subtraction

Time of First Successful Submission: 2026-01-15 15:29:42

swap-stack-values

Time of First Successful Submission: 2026-01-15 15:34:51

average-stack-values

Time of First Successful Submission: 2026-01-15 15:42:51

absolute-jump

Time of First Successful Submission: 2026-01-15 15:49:53

relative-jump

Time of First Successful Submission: 2026-01-15 16:08:16

jump-trampoline

Time of First Successful Submission: 2026-01-15 16:11:16

conditional-jump

Time of First Successful Submission: 2026-01-16 16:32:41

indirect-jump

Time of First Successful Submission: 2026-01-25 17:04:09

average-loop

Time of First Successful Submission: 2026-01-25 17:13:57

count-non-zero

Time of First Successful Submission: 2026-01-25 17:22:13

string-lower

Time of First Successful Submission: 2026-01-25 18:33:36


GCA CTF

12 / 104 800 / 43544


Using the Terminal

Time of First Successful Submission: 2025-12-25 17:34:52

Using the VSCode Workspace

Time of First Successful Submission: 2025-12-25 17:35:44

Using the GUI Desktop

Time of First Successful Submission: 2025-12-25 17:36:43

Pasting into the Desktop

Time of First Successful Submission: 2025-12-25 17:38:04

Connecting over SSH

Time of First Successful Submission: 2025-12-25 17:38:31

Restarting Challenges

Time of First Successful Submission: 2025-12-25 17:40:42

Getting Help

Time of First Successful Submission: 2025-12-25 17:42:32

Challenge Programs

Time of First Successful Submission: 2025-12-25 17:43:05

The Flag File

Time of First Successful Submission: 2025-12-25 17:43:29

Using Privileged Mode

Time of First Successful Submission: 2025-12-25 17:44:34

Persistent Home Directories - One

Time of First Successful Submission: 2025-12-25 17:46:08

Persistent Home Directories - Two

Time of First Successful Submission: 2025-12-25 17:46:39