Laurent

🐧

Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-03-23 15:42:54

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

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Piping Stdout

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Piping Stdin

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Start Here

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Using the Terminal

Time of First Successful Submission: 2026-03-23 14:24:43

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-23 14:31:21

Using the GUI Desktop

Time of First Successful Submission: 2026-03-23 14:45:52

Pasting into the Desktop

Time of First Successful Submission: 2026-03-23 14:50:35

Restarting Challenges

Time of First Successful Submission: 2026-03-23 15:01:06

Challenge Programs

Time of First Successful Submission: 2026-03-23 15:20:48

The Flag File

Time of First Successful Submission: 2026-03-23 15:23:54

Using Privileged Mode

Time of First Successful Submission: 2026-03-23 15:30:26

Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-03-23 15:36:18

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

Time of First Successful Submission: 2026-03-24 12:06:41

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

Time of First Successful Submission: 2026-03-24 22:00:53

Redirecting errors

Time of First Successful Submission: 2026-03-24 22:17:50

Redirecting input

Time of First Successful Submission: 2026-03-24 22:41:17

Grepping stored results

Time of First Successful Submission: 2026-03-24 22:44:11

Grepping live output

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Grepping errors

Time of First Successful Submission: 2026-03-24 23:13:48

Filtering with grep -v

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Filtering with sed

Time of First Successful Submission: 2026-03-24 23:19:01

Duplicating piped data with tee

Time of First Successful Submission: 2026-03-25 00:11:39

Process substitution for input

Time of First Successful Submission: 2026-03-25 01:11:19

Writing to multiple programs

Time of First Successful Submission: 2026-03-25 01:41:42

Split-piping stderr and stdout

Time of First Successful Submission: 2026-03-28 15:15:26

Named pipes

Time of First Successful Submission: 2026-03-26 00:37:26

Printing Variables

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Setting Variables

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Multi-word Variables

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Exporting Variables

Time of First Successful Submission: 2026-03-25 13:51:46

Printing Exported Variables

Time of First Successful Submission: 2026-03-25 13:54:48

Storing Command Output

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Reading Input

Time of First Successful Submission: 2026-03-25 16:10:21

Reading Files

Time of First Successful Submission: 2026-03-25 16:13:33

Translating characters

Time of First Successful Submission: 2026-03-28 15:07:01

Deleting characters

Time of First Successful Submission: 2026-03-26 01:17:49

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

Time of First Successful Submission: 2026-03-26 17:14:24

Killing Processes

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Interrupting Processes

Time of First Successful Submission: 2026-03-26 23:40:10

Killing Misbehaving Processes

Time of First Successful Submission: 2026-03-27 00:01:18

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

Time of First Successful Submission: 2026-03-27 01:21:56

Cracking passwords

Time of First Successful Submission: 2026-03-27 01:28:06

Using sudo

Time of First Successful Submission: 2026-03-27 01:31:38

Changing File Ownership

Time of First Successful Submission: 2026-03-27 14:42:06

Groups and Files

Time of First Successful Submission: 2026-03-27 14:46:57

Fun With Groups Names

Time of First Successful Submission: 2026-03-27 14:51:14

Changing Permissions

Time of First Successful Submission: 2026-03-27 15:02:59

Executable Files

Time of First Successful Submission: 2026-03-27 15:04:38

Permission Tweaking Practice

Time of First Successful Submission: 2026-03-27 15:21:04

Permissions Setting Practice

Time of First Successful Submission: 2026-03-27 16:10:31

The SUID Bit

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Chaining with Semicolons

Time of First Successful Submission: 2026-03-28 00:49:03

Building on Success

Time of First Successful Submission: 2026-03-28 00:50:35

Handling Failure

Time of First Successful Submission: 2026-03-28 00:51:35

Your First Shell Script

Time of First Successful Submission: 2026-03-28 00:54:21

Redirecting Script Output

Time of First Successful Submission: 2026-03-28 01:00:46

Executable Shell Scripts

Time of First Successful Submission: 2026-03-28 01:02:55

Understanding Shebangs

Time of First Successful Submission: 2026-03-28 01:06:51

Scripting with Arguments

Time of First Successful Submission: 2026-03-28 01:11:12

Scripting with Conditionals

Time of First Successful Submission: 2026-03-28 01:16:04

Scripting with Default Cases

Time of First Successful Submission: 2026-03-28 01:24:07

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-03-28 01:32:57

Reading Shell Scripts

Time of First Successful Submission: 2026-03-28 01:37:45

Launching Screen

Time of First Successful Submission: 2026-03-28 14:37:01

Detaching and Attaching

Time of First Successful Submission: 2026-03-28 14:38:15

Finding Sessions

Time of First Successful Submission: 2026-03-28 14:39:22

Switching Windows

Time of First Successful Submission: 2026-03-28 14:41:47

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-03-28 14:43:06

Switching Windows (tmux)

Time of First Successful Submission: 2026-03-28 14:47:01

The PATH Variable

Time of First Successful Submission: 2026-03-28 14:59:53

Setting PATH

Time of First Successful Submission: 2026-03-28 15:03:53

Finding Commands

Time of First Successful Submission: 2026-03-28 15:05:14

Adding Commands

Time of First Successful Submission: 2026-03-28 15:22:00

Hijacking Commands

Time of First Successful Submission: 2026-03-28 16:12:47

Bashrc Backdoor

Time of First Successful Submission: 2026-03-28 17:00:11

Sniffing Input

Time of First Successful Submission: 2026-03-28 22:28:40

Overshared Directories

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Tricky Linking

Time of First Successful Submission: 2026-03-28 23:01:04

Sniffing Process Arguments

Time of First Successful Submission: 2026-03-28 23:29:42

Snooping on Configurations

Time of First Successful Submission: 2026-03-28 23:33:11

The Fork Bomb

Time of First Successful Submission: 2026-03-29 00:12:48

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: 2026-03-29 00:42:27

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: 2026-03-29 14:07:20

Moving Between Registers

Time of First Successful Submission: 2026-03-29 14:17:02

Loading From Memory

Time of First Successful Submission: 2026-03-29 22:29:16

More Loading Practice

Time of First Successful Submission: 2026-03-29 22:44:27

Dereferencing Pointers

Time of First Successful Submission: 2026-03-29 22:51:10

Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

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Double Dereference

Time of First Successful Submission: 2026-03-29 23:39:35

The Stack

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

Stack Offsets

Time of First Successful Submission: 2026-03-30 11:40:53

Program Arguments on the Stack

Time of First Successful Submission: 2026-03-30 11:53:39

Popping From the Stack

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Disassembling Programs

Time of First Successful Submission: 2026-03-30 14:36:27

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

Time of First Successful Submission: 2026-03-30 15:12:57

Reading Register Values

Time of First Successful Submission: 2026-03-30 15:15:07

Popping Stack Values

Time of First Successful Submission: 2026-03-30 15:34:21

Examining Memory

Time of First Successful Submission: 2026-03-30 15:46:47

Examining Stack Pointers

Time of First Successful Submission: 2026-03-30 15:57:23

Cooperative Debugging

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Writing Output

Time of First Successful Submission: 2026-03-30 22:04:43

Chaining Syscalls

Time of First Successful Submission: 2026-03-30 22:26:32

Writing Strings

Time of First Successful Submission: 2026-03-30 22:28:35

Reading Data

Time of First Successful Submission: 2026-03-30 22:54:45

Opening Files

Time of First Successful Submission: 2026-03-31 14:54:53

Hardcoding the Filename

Time of First Successful Submission: 2026-03-31 23:27:48

Comparing Values

Time of First Successful Submission: 2026-04-01 22:46:33

Comparing Characters

Time of First Successful Submission: 2026-04-01 22:57:20

Conditional Control Flow

Time of First Successful Submission: 2026-04-01 23:11:45

Comparing Strings

Time of First Successful Submission: 2026-04-07 12:11:24

Reverse the Password

Time of First Successful Submission: 2026-04-07 22:19:08

Conditionals Without Conditionals

Time of First Successful Submission: 2026-04-07 23:46:02

Looping

Time of First Successful Submission: 2026-04-08 14:54:38

Reverse the Calculation

Time of First Successful Submission: 2026-04-08 15:45:07

Reverse the Reverse

Time of First Successful Submission: 2026-04-08 16:00:01

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-04-08 21:18:53

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

Time of First Successful Submission: 2026-04-10 13:39:24

modulo-operation

Time of First Successful Submission: 2026-04-10 21:40:42

set-upper-byte

Time of First Successful Submission: 2026-04-10 21:51:49

efficient-modulo

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byte-extraction

Time of First Successful Submission: 2026-04-11 00:14:15

bitwise-and

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check-even

Time of First Successful Submission: 2026-04-12 16:18:39

memory-read

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memory-write

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memory-increment

Time of First Successful Submission: 2026-04-12 20:34:07

byte-access

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memory-size-access

Time of First Successful Submission: 2026-04-12 20:59:56

little-endian-write

Time of First Successful Submission: 2026-04-12 22:16:47

memory-sum

Time of First Successful Submission: 2026-04-12 22:42:43

stack-subtraction

Time of First Successful Submission: 2026-04-12 23:10:50

swap-stack-values

Time of First Successful Submission: 2026-04-12 23:22:22

average-stack-values

Time of First Successful Submission: 2026-04-13 12:42:32

absolute-jump

Time of First Successful Submission: 2026-04-13 13:20:36

relative-jump

Time of First Successful Submission: 2026-04-13 14:06:17

jump-trampoline

Time of First Successful Submission: 2026-04-13 15:37:31

DOS Dojo

7 / 10 54 / 78

cat.exe (type)

Time of First Successful Submission: 2026-04-13 16:48:10

ls.exe (dir)

Time of First Successful Submission: 2026-04-13 16:52:21

Changing Disks

Time of First Successful Submission: 2026-04-13 16:54:05

Reading Floppies

Time of First Successful Submission: 2026-04-13 16:59:19

Installing MS-DOS

Time of First Successful Submission: 2026-04-13 17:05:04

autoexec.bat

Time of First Successful Submission: 2026-04-13 17:09:49

doskey

Time of First Successful Submission: 2026-04-13 17:18:56

GCA CTF

12 / 104 2100 / 44655

Using the Terminal

Time of First Successful Submission: 2026-03-23 14:24:43

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-23 14:31:21

Using the GUI Desktop

Time of First Successful Submission: 2026-03-23 14:45:52

Pasting into the Desktop

Time of First Successful Submission: 2026-03-23 14:50:35

Connecting over SSH

Time of First Successful Submission: 2026-03-23 14:56:39

Restarting Challenges

Time of First Successful Submission: 2026-03-23 15:01:06

Getting Help

Time of First Successful Submission: 2026-03-23 15:03:51

Challenge Programs

Time of First Successful Submission: 2026-03-23 15:20:48

The Flag File

Time of First Successful Submission: 2026-03-23 15:23:54

Using Privileged Mode

Time of First Successful Submission: 2026-03-23 15:30:26

Persistent Home Directories - One

Time of First Successful Submission: 2026-03-23 15:35:23

Persistent Home Directories - Two

Time of First Successful Submission: 2026-03-23 15:36:18