dns

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-02-21 09:48:02

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: 2026-02-21 18:03:03

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: 2026-02-21 08:49:25

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-21 08:51:40

Using the GUI Desktop

Time of First Successful Submission: 2026-02-21 08:57:21

Pasting into the Desktop

Time of First Successful Submission: 2026-02-21 08:59:30

Restarting Challenges

Time of First Successful Submission: 2026-02-21 09:10:21

Challenge Programs

Time of First Successful Submission: 2026-02-21 09:21:48

The Flag File

Time of First Successful Submission: 2026-02-21 09:33:02

Using Privileged Mode

Time of First Successful Submission: 2026-02-21 09:37:20

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-21 09:43:40

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-21 09:45:17

Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-02-21 09:48:02

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

Time of First Successful Submission: 2026-02-21 09:57:11

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

Time of First Successful Submission: 2026-02-21 10:48:33

comparing files

Time of First Successful Submission: 2026-02-21 10:50:29

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: 2026-02-21 11:07:00

An Epic Filesystem Quest

Time of First Successful Submission: 2026-02-21 11:39:44

making directories

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finding files

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linking files

Time of First Successful Submission: 2026-02-21 14:54:06

Learning From Documentation

Time of First Successful Submission: 2026-02-21 14:59:23

Learning Complex Usage

Time of First Successful Submission: 2026-02-21 15:01:36

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

Time of First Successful Submission: 2026-02-21 18:03:03

Redirecting more output

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Appending output

Time of First Successful Submission: 2026-02-21 18:07:43

Redirecting errors

Time of First Successful Submission: 2026-02-21 18:12:46

Redirecting input

Time of First Successful Submission: 2026-02-21 18:15:40

Grepping stored results

Time of First Successful Submission: 2026-02-21 18:18:25

Grepping live output

Time of First Successful Submission: 2026-02-21 18:19:49

Grepping errors

Time of First Successful Submission: 2026-02-21 18:23:12

Filtering with grep -v

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Filtering with sed

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Duplicating piped data with tee

Time of First Successful Submission: 2026-02-21 18:38:14

Process substitution for input

Time of First Successful Submission: 2026-02-21 18:45:06

Writing to multiple programs

Time of First Successful Submission: 2026-02-21 18:53:04

Split-piping stderr and stdout

Time of First Successful Submission: 2026-02-21 18:56:37

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

Time of First Successful Submission: 2026-02-21 19:15:21

Printing Exported Variables

Time of First Successful Submission: 2026-02-21 19:16:27

Storing Command Output

Time of First Successful Submission: 2026-02-21 19:19:27

Reading Input

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

Reading Files

Time of First Successful Submission: 2026-02-26 08:42:57

Translating characters

Time of First Successful Submission: 2026-02-26 09:00:58

Deleting characters

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Deleting newlines

Time of First Successful Submission: 2026-02-26 09:05:57

Extracting the first lines with head

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Extracting specific sections of text

Time of First Successful Submission: 2026-02-26 09:10:38

Sorting data

Time of First Successful Submission: 2026-02-26 09:13:05

Listing Processes

Time of First Successful Submission: 2026-02-26 09:21:08

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: 2026-02-26 10:08:14

Using sudo

Time of First Successful Submission: 2026-02-26 10:10:24

Changing File Ownership

Time of First Successful Submission: 2026-02-26 10:15:20

Groups and Files

Time of First Successful Submission: 2026-02-26 10:18:36

Fun With Groups Names

Time of First Successful Submission: 2026-02-26 10:20:16

Changing Permissions

Time of First Successful Submission: 2026-02-26 10:24:00

Executable Files

Time of First Successful Submission: 2026-02-26 10:25:50

Permission Tweaking Practice

Time of First Successful Submission: 2026-02-26 10:46:08

Permissions Setting Practice

Time of First Successful Submission: 2026-02-26 10:53:27

The SUID Bit

Time of First Successful Submission: 2026-02-26 11:04:54

Chaining with Semicolons

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Building on Success

Time of First Successful Submission: 2026-02-26 14:27:06

Handling Failure

Time of First Successful Submission: 2026-02-26 14:28:50

Your First Shell Script

Time of First Successful Submission: 2026-02-26 14:33:12

Redirecting Script Output

Time of First Successful Submission: 2026-02-26 14:35:49

Executable Shell Scripts

Time of First Successful Submission: 2026-02-26 14:37:14

Understanding Shebangs

Time of First Successful Submission: 2026-02-26 14:40:36

Scripting with Arguments

Time of First Successful Submission: 2026-02-26 14:47:14

Scripting with Conditionals

Time of First Successful Submission: 2026-02-26 14:51:07

Scripting with Default Cases

Time of First Successful Submission: 2026-02-26 14:52:50

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-02-26 14:56:32

Reading Shell Scripts

Time of First Successful Submission: 2026-02-26 14:58:44

Launching Screen

Time of First Successful Submission: 2026-02-26 14:59:59

Detaching and Attaching

Time of First Successful Submission: 2026-02-26 15:02:55

Finding Sessions

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

Switching Windows

Time of First Successful Submission: 2026-02-26 15:07:46

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-02-26 15:09:54

Switching Windows (tmux)

Time of First Successful Submission: 2026-02-26 15:16:51

The PATH Variable

Time of First Successful Submission: 2026-02-26 15:22:15

Setting PATH

Time of First Successful Submission: 2026-02-26 15:25:05

Finding Commands

Time of First Successful Submission: 2026-02-26 15:37:00

Adding Commands

Time of First Successful Submission: 2026-02-26 15:53:55

Hijacking Commands

Time of First Successful Submission: 2026-02-26 15:57:54

Bashrc Backdoor

Time of First Successful Submission: 2026-02-26 16:12:13

Sniffing Input

Time of First Successful Submission: 2026-02-26 16:25:43

Overshared Directories

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Tricky Linking

Time of First Successful Submission: 2026-02-26 17:03:34

Sniffing Process Arguments

Time of First Successful Submission: 2026-02-26 17:24:11

Snooping on Configurations

Time of First Successful Submission: 2026-02-26 17:33:42

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: 2026-02-26 20:03:34

Moving Between Registers

Time of First Successful Submission: 2026-02-26 20:06:31

Loading From Memory

Time of First Successful Submission: 2026-02-26 20:11:07

More Loading Practice

Time of First Successful Submission: 2026-02-26 20:12:06

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

Time of First Successful Submission: 2026-02-26 20:40:21

Popping From the Stack

Time of First Successful Submission: 2026-02-26 20:45:22

Disassembling Programs

Time of First Successful Submission: 2026-02-26 20:50:58

Tracing Syscalls

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Starting GDB

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Quitting GDB

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Starting Programs in GDB

Time of First Successful Submission: 2026-02-26 20:59:51

Disassembling in GDB

Time of First Successful Submission: 2026-02-26 21:00:55

Stepping Through Instructions

Time of First Successful Submission: 2026-02-26 21:03:28

Reading Register Values

Time of First Successful Submission: 2026-02-26 21:24:29

Popping Stack Values

Time of First Successful Submission: 2026-02-26 21:26:08

Examining Memory

Time of First Successful Submission: 2026-02-26 21:28:00

Examining Stack Pointers

Time of First Successful Submission: 2026-02-26 21:30:46

Cooperative Debugging

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Writing Output

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Chaining Syscalls

Time of First Successful Submission: 2026-02-26 21:52:55

Writing Strings

Time of First Successful Submission: 2026-02-26 21:53:51

Reading Data

Time of First Successful Submission: 2026-02-26 22:02:34

Opening Files

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

Hardcoding the Filename

Time of First Successful Submission: 2026-02-26 22:20:48

Comparing Values

Time of First Successful Submission: 2026-02-26 22:30:17

Comparing Characters

Time of First Successful Submission: 2026-02-26 22:36:45

Conditional Control Flow

Time of First Successful Submission: 2026-02-26 22:42:52

Comparing Strings

Time of First Successful Submission: 2026-02-26 22:49:10

Reverse the Password

Time of First Successful Submission: 2026-02-26 23:02:03

Conditionals Without Conditionals

Time of First Successful Submission: 2026-02-26 23:15:21

Looping

Time of First Successful Submission: 2026-02-26 23:20:33

Reverse the Calculation

Time of First Successful Submission: 2026-02-26 23:29:49

Reverse the Reverse

Time of First Successful Submission: 2026-02-26 23:31:55

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-02-26 23:36:24

Loops on Data

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set-register

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set-multiple-registers

Time of First Successful Submission: 2026-02-26 23:44:00

add-to-register

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linear-equation-registers

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integer-division

Time of First Successful Submission: 2026-02-27 00:01:12

modulo-operation

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set-upper-byte

Time of First Successful Submission: 2026-02-27 00:07:40

efficient-modulo

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byte-extraction

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bitwise-and

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check-even

Time of First Successful Submission: 2026-02-27 06:57:44

memory-read

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memory-write

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memory-increment

Time of First Successful Submission: 2026-02-27 07:29:17

byte-access

Time of First Successful Submission: 2026-02-27 07:31:22

memory-size-access

Time of First Successful Submission: 2026-02-27 07:46:21

little-endian-write

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memory-sum

Time of First Successful Submission: 2026-02-27 07:59:44

stack-subtraction

Time of First Successful Submission: 2026-02-27 08:02:37

swap-stack-values

Time of First Successful Submission: 2026-02-27 08:07:11

average-stack-values

Time of First Successful Submission: 2026-02-27 08:20:39

absolute-jump

Time of First Successful Submission: 2026-02-27 08:38:38

relative-jump

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jump-trampoline

Time of First Successful Submission: 2026-02-27 09:32:17

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

Time of First Successful Submission: 2026-02-27 14:39:45

Bind

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Listen

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Accept

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Static Response

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-02-27 19:09:18

... and again!

Time of First Successful Submission: 2026-02-27 21:59:01

Newline Troubles

Time of First Successful Submission: 2026-02-27 22:08:22

Reasoning about files

Time of First Successful Submission: 2026-02-27 22:20:27

Specifying Filenames

Time of First Successful Submission: 2026-02-27 22:22:30

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-02-21 08:49:25

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-21 08:51:40

Using the GUI Desktop

Time of First Successful Submission: 2026-02-21 08:57:21

Pasting into the Desktop

Time of First Successful Submission: 2026-02-21 08:59:30

Connecting over SSH

Time of First Successful Submission: 2026-02-21 09:07:03

Restarting Challenges

Time of First Successful Submission: 2026-02-21 09:10:21

Getting Help

Time of First Successful Submission: 2026-02-21 09:14:32

Challenge Programs

Time of First Successful Submission: 2026-02-21 09:21:48

The Flag File

Time of First Successful Submission: 2026-02-21 09:33:02

Using Privileged Mode

Time of First Successful Submission: 2026-02-21 09:37:20

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-21 09:43:40

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-21 09:45:17