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Triple Dereference

Time of First Successful Submission: 2026-02-09 18:38:20


Intro to Programming Languages

15 / 234 8275 / 30025


Commands

Time of First Successful Submission: 2026-02-01 17:51:11

Command Arguments

Time of First Successful Submission: 2026-02-01 17:51:54

Command History

Time of First Successful Submission: 2026-02-01 17:52:27

The Root Path

Time of First Successful Submission: 2026-02-02 09:51:16

Absolute Paths

Time of First Successful Submission: 2026-02-02 09:59:16

Changing position

Time of First Successful Submission: 2026-02-02 10:01:30

Changing to an Absolute Path

Time of First Successful Submission: 2026-02-02 10:13:47

Relative Paths

Time of First Successful Submission: 2026-02-02 10:24:42

Cat

Time of First Successful Submission: 2026-02-02 11:16:08

Ls

Time of First Successful Submission: 2026-02-02 11:30:53

Ls All

Time of First Successful Submission: 2026-02-02 11:37:27

Find

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

Piping Echo

Time of First Successful Submission: 2026-02-04 06:11:34

Piping Stdout

Time of First Successful Submission: 2026-02-04 06:15:41

Piping Stdin

Time of First Successful Submission: 2026-02-04 08:19:40


Start Here

12 / 12 1048 / 40673


Using the Terminal

Time of First Successful Submission: 2026-02-01 16:08:34

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-01 16:10:38

Using the GUI Desktop

Time of First Successful Submission: 2026-02-01 16:12:16

Pasting into the Desktop

Time of First Successful Submission: 2026-02-01 16:14:47

Restarting Challenges

Time of First Successful Submission: 2026-02-01 16:25:28

Challenge Programs

Time of First Successful Submission: 2026-02-01 17:26:20

The Flag File

Time of First Successful Submission: 2026-02-01 17:28:04

Using Privileged Mode

Time of First Successful Submission: 2026-02-01 17:33:22

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-01 17:39:00

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-01 17:39:50


Linux Luminarium

128 / 128 1963 / 30395


Intro to Commands

Time of First Successful Submission: 2026-02-01 17:51:11

Intro to Arguments

Time of First Successful Submission: 2026-02-01 17:51:54

Command History

Time of First Successful Submission: 2026-02-01 17:52:27

The Root

Time of First Successful Submission: 2026-02-02 09:51:16

Program and absolute paths

Time of First Successful Submission: 2026-02-02 09:59:16

Position thy self

Time of First Successful Submission: 2026-02-02 10:01:30

Position elsewhere

Time of First Successful Submission: 2026-02-02 10:13:47

implicit relative paths, from /

Time of First Successful Submission: 2026-02-02 10:24:42

explicit relative paths, from /

Time of First Successful Submission: 2026-02-02 10:25:57

implicit relative path

Time of First Successful Submission: 2026-02-02 10:27:03

home sweet home

Time of First Successful Submission: 2026-02-02 10:30:59

cat: not the pet, but the command!

Time of First Successful Submission: 2026-02-02 11:16:08

catting absolute paths

Time of First Successful Submission: 2026-02-02 11:16:35

more catting practice

Time of First Successful Submission: 2026-02-02 11:20:06

grepping for a needle in a haystack

Time of First Successful Submission: 2026-02-02 11:28:13

comparing files

Time of First Successful Submission: 2026-02-02 11:29:51

listing files

Time of First Successful Submission: 2026-02-02 11:30:53

touching files

Time of First Successful Submission: 2026-02-02 11:31:49

removing files

Time of First Successful Submission: 2026-02-02 11:32:37

moving files

Time of First Successful Submission: 2026-02-02 11:34:35

copying files

Time of First Successful Submission: 2026-02-02 11:36:31

hidden files

Time of First Successful Submission: 2026-02-02 11:37:27

An Epic Filesystem Quest

Time of First Successful Submission: 2026-02-02 11:44:24

making directories

Time of First Successful Submission: 2026-02-02 11:45:28

finding files

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

linking files

Time of First Successful Submission: 2026-02-02 13:16:57

Learning From Documentation

Time of First Successful Submission: 2026-02-02 13:24:21

Learning Complex Usage

Time of First Successful Submission: 2026-02-02 13:26:29

Reading Manuals

Time of First Successful Submission: 2026-02-02 13:42:52

Searching Manuals

Time of First Successful Submission: 2026-02-02 13:44:23

Searching For Manuals

Time of First Successful Submission: 2026-02-02 13:59:42

Helpful Programs

Time of First Successful Submission: 2026-02-02 14:01:46

Help for Builtins

Time of First Successful Submission: 2026-02-02 14:10:32

Matching with *

Time of First Successful Submission: 2026-02-03 17:28:12

Matching with ?

Time of First Successful Submission: 2026-02-03 17:29:33

Matching with []

Time of First Successful Submission: 2026-02-03 18:11:16

Matching paths with []

Time of First Successful Submission: 2026-02-03 18:17:23

Multiple globs

Time of First Successful Submission: 2026-02-03 18:20:05

Mixing globs

Time of First Successful Submission: 2026-02-03 18:28:54

Exclusionary globbing

Time of First Successful Submission: 2026-02-04 05:47:23

Tab completion

Time of First Successful Submission: 2026-02-04 05:49:00

Multiple options for tab completion

Time of First Successful Submission: 2026-02-04 05:51:12

Tab completion on commands

Time of First Successful Submission: 2026-02-04 05:52:20

Redirecting output

Time of First Successful Submission: 2026-02-04 06:11:34

Redirecting more output

Time of First Successful Submission: 2026-02-04 06:15:41

Appending output

Time of First Successful Submission: 2026-02-04 08:12:27

Redirecting errors

Time of First Successful Submission: 2026-02-04 08:15:40

Redirecting input

Time of First Successful Submission: 2026-02-04 08:19:40

Grepping stored results

Time of First Successful Submission: 2026-02-04 08:21:17

Grepping live output

Time of First Successful Submission: 2026-02-04 08:22:01

Grepping errors

Time of First Successful Submission: 2026-02-04 08:42:24

Filtering with grep -v

Time of First Successful Submission: 2026-02-04 08:44:45

Filtering with sed

Time of First Successful Submission: 2026-02-04 08:47:14

Duplicating piped data with tee

Time of First Successful Submission: 2026-02-04 08:52:52

Process substitution for input

Time of First Successful Submission: 2026-02-04 09:22:59

Writing to multiple programs

Time of First Successful Submission: 2026-02-04 09:56:08

Split-piping stderr and stdout

Time of First Successful Submission: 2026-02-04 09:58:57

Named pipes

Time of First Successful Submission: 2026-02-04 10:04:48

Printing Variables

Time of First Successful Submission: 2026-02-04 10:09:58

Setting Variables

Time of First Successful Submission: 2026-02-04 10:11:56

Multi-word Variables

Time of First Successful Submission: 2026-02-04 10:14:39

Exporting Variables

Time of First Successful Submission: 2026-02-04 10:53:09

Printing Exported Variables

Time of First Successful Submission: 2026-02-04 10:53:45

Storing Command Output

Time of First Successful Submission: 2026-02-04 10:55:34

Reading Input

Time of First Successful Submission: 2026-02-04 11:04:48

Reading Files

Time of First Successful Submission: 2026-02-04 11:08:12

Translating characters

Time of First Successful Submission: 2026-02-05 15:46:35

Deleting characters

Time of First Successful Submission: 2026-02-05 15:47:56

Deleting newlines

Time of First Successful Submission: 2026-02-05 15:49:26

Extracting the first lines with head

Time of First Successful Submission: 2026-02-05 15:52:34

Extracting specific sections of text

Time of First Successful Submission: 2026-02-05 15:55:55

Sorting data

Time of First Successful Submission: 2026-02-05 16:01:07

Listing Processes

Time of First Successful Submission: 2026-02-05 16:18:12

Killing Processes

Time of First Successful Submission: 2026-02-05 16:19:58

Interrupting Processes

Time of First Successful Submission: 2026-02-05 16:20:45

Killing Misbehaving Processes

Time of First Successful Submission: 2026-02-05 16:42:38

Suspending Processes

Time of First Successful Submission: 2026-02-05 16:43:44

Resuming Processes

Time of First Successful Submission: 2026-02-05 16:44:31

Backgrounding Processes

Time of First Successful Submission: 2026-02-05 16:52:34

Foregrounding Processes

Time of First Successful Submission: 2026-02-05 16:53:40

Starting Backgrounded Processes

Time of First Successful Submission: 2026-02-05 16:54:43

Process Exit Codes

Time of First Successful Submission: 2026-02-05 16:56:50

Becoming root with su

Time of First Successful Submission: 2026-02-05 17:04:30

Other users with su

Time of First Successful Submission: 2026-02-05 17:05:24

Cracking passwords

Time of First Successful Submission: 2026-02-05 17:13:09

Using sudo

Time of First Successful Submission: 2026-02-05 17:15:03

Changing File Ownership

Time of First Successful Submission: 2026-02-07 21:17:27

Groups and Files

Time of First Successful Submission: 2026-02-07 21:22:17

Fun With Groups Names

Time of First Successful Submission: 2026-02-07 21:23:15

Changing Permissions

Time of First Successful Submission: 2026-02-07 21:34:04

Executable Files

Time of First Successful Submission: 2026-02-07 21:37:02

Permission Tweaking Practice

Time of First Successful Submission: 2026-02-07 22:04:15

Permissions Setting Practice

Time of First Successful Submission: 2026-02-07 22:11:57

The SUID Bit

Time of First Successful Submission: 2026-02-07 22:17:00

Chaining with Semicolons

Time of First Successful Submission: 2026-02-07 22:22:08

Building on Success

Time of First Successful Submission: 2026-02-07 22:24:02

Handling Failure

Time of First Successful Submission: 2026-02-07 22:24:51

Your First Shell Script

Time of First Successful Submission: 2026-02-07 22:30:59

Redirecting Script Output

Time of First Successful Submission: 2026-02-07 22:35:48

Executable Shell Scripts

Time of First Successful Submission: 2026-02-07 22:40:00

Understanding Shebangs

Time of First Successful Submission: 2026-02-07 22:45:22

Scripting with Arguments

Time of First Successful Submission: 2026-02-07 22:47:29

Scripting with Conditionals

Time of First Successful Submission: 2026-02-07 23:01:47

Scripting with Default Cases

Time of First Successful Submission: 2026-02-07 23:05:01

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-02-07 23:16:09

Reading Shell Scripts

Time of First Successful Submission: 2026-02-07 23:24:58

Launching Screen

Time of First Successful Submission: 2026-02-08 08:05:45

Detaching and Attaching

Time of First Successful Submission: 2026-02-08 08:07:42

Finding Sessions

Time of First Successful Submission: 2026-02-08 08:09:04

Switching Windows

Time of First Successful Submission: 2026-02-08 08:15:33

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-02-08 08:16:57

Switching Windows (tmux)

Time of First Successful Submission: 2026-02-08 09:15:34

The PATH Variable

Time of First Successful Submission: 2026-02-08 09:26:46

Setting PATH

Time of First Successful Submission: 2026-02-08 09:39:22

Finding Commands

Time of First Successful Submission: 2026-02-08 10:00:11

Adding Commands

Time of First Successful Submission: 2026-02-08 10:31:43

Hijacking Commands

Time of First Successful Submission: 2026-02-08 10:56:13

Bashrc Backdoor

Time of First Successful Submission: 2026-02-08 11:26:49

Sniffing Input

Time of First Successful Submission: 2026-02-08 11:55:19

Overshared Directories

Time of First Successful Submission: 2026-02-08 13:07:13

Tricky Linking

Time of First Successful Submission: 2026-02-08 13:45:30

Sniffing Process Arguments

Time of First Successful Submission: 2026-02-08 13:52:16

Snooping on Configurations

Time of First Successful Submission: 2026-02-08 13:54:30

The Fork Bomb

Time of First Successful Submission: 2026-02-08 15:17:35

Disk-Space Doomsday

Time of First Successful Submission: 2026-02-08 15:46:48

rm -rf /

Time of First Successful Submission: 2026-02-08 15:50:04

Life after rm -rf /

Time of First Successful Submission: 2026-02-08 15:55:03

Finding meaning after rm -rf /

Time of First Successful Submission: 2026-02-08 16:06:04


Computing 101

94 / 94 58 / 20604


Your First Register

Time of First Successful Submission: 2026-02-09 07:06:31

Your First Syscall

Time of First Successful Submission: 2026-02-09 07:08:43

Exit Codes

Time of First Successful Submission: 2026-02-09 07:11:05

Building Executables

Time of First Successful Submission: 2026-02-09 07:20:23

Moving Between Registers

Time of First Successful Submission: 2026-02-09 07:27:08

Loading From Memory

Time of First Successful Submission: 2026-02-09 16:01:26

More Loading Practice

Time of First Successful Submission: 2026-02-09 16:02:40

Dereferencing Pointers

Time of First Successful Submission: 2026-02-09 16:05:37

Dereferencing Yourself

Time of First Successful Submission: 2026-02-09 16:06:37

Dereferencing with Offsets

Time of First Successful Submission: 2026-02-09 16:22:42

Stored Addresses

Time of First Successful Submission: 2026-02-09 16:26:44

Double Dereference

Time of First Successful Submission: 2026-02-09 18:36:20

The Stack

Time of First Successful Submission: 2026-02-19 17:28:15

Stack Offsets

Time of First Successful Submission: 2026-02-19 17:29:39

Program Arguments on the Stack

Time of First Successful Submission: 2026-02-19 17:51:03

Popping From the Stack

Time of First Successful Submission: 2026-02-19 18:00:38

Disassembling Programs

Time of First Successful Submission: 2026-02-20 10:21:20

Tracing Syscalls

Time of First Successful Submission: 2026-02-09 13:01:27

Starting GDB

Time of First Successful Submission: 2026-02-09 13:02:47

Quitting GDB

Time of First Successful Submission: 2026-02-20 10:22:14

Starting Programs in GDB

Time of First Successful Submission: 2026-02-09 13:04:47

Disassembling in GDB

Time of First Successful Submission: 2026-02-20 10:23:27

Stepping Through Instructions

Time of First Successful Submission: 2026-02-20 10:24:55

Reading Register Values

Time of First Successful Submission: 2026-02-20 10:27:55

Popping Stack Values

Time of First Successful Submission: 2026-02-20 10:30:14

Examining Memory

Time of First Successful Submission: 2026-02-20 10:32:42

Examining Stack Pointers

Time of First Successful Submission: 2026-02-20 10:35:35

Cooperative Debugging

Time of First Successful Submission: 2026-02-20 10:44:02

Writing Output

Time of First Successful Submission: 2026-02-09 19:40:36

Chaining Syscalls

Time of First Successful Submission: 2026-02-09 19:42:46

Writing Strings

Time of First Successful Submission: 2026-02-09 19:44:42

Reading Data

Time of First Successful Submission: 2026-02-09 19:49:21

Opening Files

Time of First Successful Submission: 2026-02-20 20:49:34

Hardcoding the Filename

Time of First Successful Submission: 2026-02-20 21:14:16

Comparing Values

Time of First Successful Submission: 2026-02-20 21:29:42

Comparing Characters

Time of First Successful Submission: 2026-02-20 21:36:49

Conditional Control Flow

Time of First Successful Submission: 2026-02-20 22:39:50

Comparing Strings

Time of First Successful Submission: 2026-02-20 22:52:15

Reverse the Password

Time of First Successful Submission: 2026-02-20 22:59:52

Conditionals Without Conditionals

Time of First Successful Submission: 2026-02-21 05:09:08

Looping

Time of First Successful Submission: 2026-02-21 05:15:26

Reverse the Calculation

Time of First Successful Submission: 2026-02-21 05:26:21

Reverse the Reverse

Time of First Successful Submission: 2026-02-21 05:28:05

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-02-21 05:31:41

Loops on Data

Time of First Successful Submission: 2026-02-21 05:34:30

set-register

Time of First Successful Submission: 2026-02-10 17:48:20

set-multiple-registers

Time of First Successful Submission: 2026-02-10 17:51:31

add-to-register

Time of First Successful Submission: 2026-02-10 17:53:57

linear-equation-registers

Time of First Successful Submission: 2026-02-10 18:03:38

integer-division

Time of First Successful Submission: 2026-02-10 18:31:38

modulo-operation

Time of First Successful Submission: 2026-02-10 18:36:09

set-upper-byte

Time of First Successful Submission: 2026-02-10 18:38:32

efficient-modulo

Time of First Successful Submission: 2026-02-10 18:55:08

byte-extraction

Time of First Successful Submission: 2026-02-10 19:08:20

bitwise-and

Time of First Successful Submission: 2026-02-10 20:45:41

check-even

Time of First Successful Submission: 2026-02-10 21:14:43

memory-read

Time of First Successful Submission: 2026-02-10 21:19:19

memory-write

Time of First Successful Submission: 2026-02-10 21:20:22

memory-increment

Time of First Successful Submission: 2026-02-10 21:24:54

byte-access

Time of First Successful Submission: 2026-02-10 21:29:41

memory-size-access

Time of First Successful Submission: 2026-02-10 21:34:39

little-endian-write

Time of First Successful Submission: 2026-02-10 21:42:58

memory-sum

Time of First Successful Submission: 2026-02-10 21:54:53

stack-subtraction

Time of First Successful Submission: 2026-02-10 21:58:14

swap-stack-values

Time of First Successful Submission: 2026-02-10 22:01:04

average-stack-values

Time of First Successful Submission: 2026-02-10 22:08:26

absolute-jump

Time of First Successful Submission: 2026-02-10 22:12:18

relative-jump

Time of First Successful Submission: 2026-02-10 22:29:32

jump-trampoline

Time of First Successful Submission: 2026-02-10 22:34:11

conditional-jump

Time of First Successful Submission: 2026-02-11 08:34:23

indirect-jump

Time of First Successful Submission: 2026-02-11 09:37:14

average-loop

Time of First Successful Submission: 2026-02-11 11:46:36

count-non-zero

Time of First Successful Submission: 2026-02-11 13:08:25

string-lower

Time of First Successful Submission: 2026-02-16 10:06:47

most-common-byte

Time of First Successful Submission: 2026-02-16 14:14:08

Exit

Time of First Successful Submission: 2026-02-21 08:14:02

Socket

Time of First Successful Submission: 2026-02-21 08:47:45

Bind

Time of First Successful Submission: 2026-02-21 19:53:55

Listen

Time of First Successful Submission: 2026-02-21 20:10:13

Accept

Time of First Successful Submission: 2026-02-21 20:15:22

Static Response

Time of First Successful Submission: 2026-02-22 18:57:27

Dynamic Response

Time of First Successful Submission: 2026-02-22 23:36:46

Iterative GET Server

Time of First Successful Submission: 2026-02-22 23:44:09

Concurrent GET Server

Time of First Successful Submission: 2026-02-23 09:58:44

Concurrent POST Server

Time of First Successful Submission: 2026-02-24 17:33:59

Web Server

Time of First Successful Submission: 2026-02-24 17:55:11

Debugging Programs

Time of First Successful Submission: 2026-02-16 16:04:19

Inspecting Registers

Time of First Successful Submission: 2026-02-16 16:06:47

Examining Memory

Time of First Successful Submission: 2026-02-16 16:45:49

Setting Breakpoints

Time of First Successful Submission: 2026-02-17 17:46:57

GDB Scripting

Time of First Successful Submission: 2026-02-17 18:27:12

Modifying Data

Time of First Successful Submission: 2026-02-24 18:59:11

Modifying Execution

Time of First Successful Submission: 2026-02-24 19:00:35

Broken Functions

Time of First Successful Submission: 2026-02-24 19:07:48


GCA CTF

12 / 104 1246 / 40902


Using the Terminal

Time of First Successful Submission: 2026-02-01 16:08:34

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-01 16:10:38

Using the GUI Desktop

Time of First Successful Submission: 2026-02-01 16:12:16

Pasting into the Desktop

Time of First Successful Submission: 2026-02-01 16:14:47

Connecting over SSH

Time of First Successful Submission: 2026-02-01 16:18:49

Restarting Challenges

Time of First Successful Submission: 2026-02-01 16:25:28

Getting Help

Time of First Successful Submission: 2026-02-01 16:43:42

Challenge Programs

Time of First Successful Submission: 2026-02-01 17:26:20

The Flag File

Time of First Successful Submission: 2026-02-01 17:28:04

Using Privileged Mode

Time of First Successful Submission: 2026-02-01 17:33:22

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-01 17:39:00

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-01 17:39:50