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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-04-08 13:14:08

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

Time of First Successful Submission: 2026-04-08 14:35:28

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: 2026-04-10 14:04:13

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: 2026-04-07 14:39:11

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-07 14:46:06

Using the GUI Desktop

Time of First Successful Submission: 2026-04-07 14:50:14

Pasting into the Desktop

Time of First Successful Submission: 2026-04-07 14:52:59

Restarting Challenges

Time of First Successful Submission: 2026-04-07 17:37:11

Challenge Programs

Time of First Successful Submission: 2026-04-07 17:45:10

The Flag File

Time of First Successful Submission: 2026-04-07 17:53:37

Using Privileged Mode

Time of First Successful Submission: 2026-04-07 18:05:52

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-07 18:09:20

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-07 18:10:01

Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-04-08 13:14:08

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

Time of First Successful Submission: 2026-04-08 16:21:06

cat: not the pet, but the command!

Time of First Successful Submission: 2026-04-09 11:15:22

catting absolute paths

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more catting practice

Time of First Successful Submission: 2026-04-09 11:21:25

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

Time of First Successful Submission: 2026-04-09 13:00:39

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

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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

Time of First Successful Submission: 2026-04-10 14:04:13

Redirecting more output

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Appending output

Time of First Successful Submission: 2026-04-10 14:12:59

Redirecting errors

Time of First Successful Submission: 2026-04-10 14:20:08

Redirecting input

Time of First Successful Submission: 2026-04-10 14:26:23

Grepping stored results

Time of First Successful Submission: 2026-04-11 09:02:02

Grepping live output

Time of First Successful Submission: 2026-04-11 09:58:58

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

Time of First Successful Submission: 2026-04-11 10:51:41

Process substitution for input

Time of First Successful Submission: 2026-04-11 11:07:49

Writing to multiple programs

Time of First Successful Submission: 2026-04-11 12:10:16

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

Time of First Successful Submission: 2026-04-11 15:06:53

Printing Exported Variables

Time of First Successful Submission: 2026-04-11 15:09:05

Storing Command Output

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Reading Input

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Reading Files

Time of First Successful Submission: 2026-04-11 15:34:41

Translating characters

Time of First Successful Submission: 2026-04-13 13:46:21

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

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

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: 2026-04-13 17:50:35

Using sudo

Time of First Successful Submission: 2026-04-13 17:59:28

Changing File Ownership

Time of First Successful Submission: 2026-04-15 09:42:19

Groups and Files

Time of First Successful Submission: 2026-04-15 09:51:11

Fun With Groups Names

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

Changing Permissions

Time of First Successful Submission: 2026-04-15 10:06:58

Executable Files

Time of First Successful Submission: 2026-04-15 10:22:57

Permission Tweaking Practice

Time of First Successful Submission: 2026-04-15 10:29:51

Permissions Setting Practice

Time of First Successful Submission: 2026-04-15 10:42:08

The SUID Bit

Time of First Successful Submission: 2026-04-15 11:03:52

Chaining with Semicolons

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Building on Success

Time of First Successful Submission: 2026-04-15 12:14:19

Handling Failure

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Your First Shell Script

Time of First Successful Submission: 2026-04-15 12:23:38

Redirecting Script Output

Time of First Successful Submission: 2026-04-15 12:47:02

Executable Shell Scripts

Time of First Successful Submission: 2026-04-15 13:12:34

Understanding Shebangs

Time of First Successful Submission: 2026-04-15 13:27:08

Scripting with Arguments

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

Scripting with Conditionals

Time of First Successful Submission: 2026-04-15 16:03:59

Scripting with Default Cases

Time of First Successful Submission: 2026-04-15 16:07:48

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-04-15 16:27:07

Reading Shell Scripts

Time of First Successful Submission: 2026-04-15 16:29:34

Launching Screen

Time of First Successful Submission: 2026-04-15 17:19:52

Detaching and Attaching

Time of First Successful Submission: 2026-04-15 17:25:51

Finding Sessions

Time of First Successful Submission: 2026-04-15 17:28:14

Switching Windows

Time of First Successful Submission: 2026-04-15 17:53:33

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-15 17:55:16

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-15 18:00:49

The PATH Variable

Time of First Successful Submission: 2026-04-15 18:07:08

Setting PATH

Time of First Successful Submission: 2026-04-15 18:11:29

Finding Commands

Time of First Successful Submission: 2026-04-15 18:25:17

Adding Commands

Time of First Successful Submission: 2026-04-15 18:36:33

Hijacking Commands

Time of First Successful Submission: 2026-04-15 18:47:40

Bashrc Backdoor

Time of First Successful Submission: 2026-04-16 08:06:56

Sniffing Input

Time of First Successful Submission: 2026-04-16 08:24:34

Overshared Directories

Time of First Successful Submission: 2026-04-16 08:44:37

Tricky Linking

Time of First Successful Submission: 2026-04-16 09:23:11

Sniffing Process Arguments

Time of First Successful Submission: 2026-04-16 16:03:34

Snooping on Configurations

Time of First Successful Submission: 2026-04-16 16:08:52

The Fork Bomb

Time of First Successful Submission: 2026-04-17 07:41:54

Disk-Space Doomsday

Time of First Successful Submission: 2026-04-17 07:58:31

rm -rf /

Time of First Successful Submission: 2026-04-17 08:22:31

Life after rm -rf /

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Finding meaning after rm -rf /

Time of First Successful Submission: 2026-04-17 08:45:16

Computing 101

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Your First Register

Time of First Successful Submission: 2026-04-17 14:15:16

Your First Syscall

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Exit Codes

Time of First Successful Submission: 2026-04-18 09:38:29

Building Executables

Time of First Successful Submission: 2026-04-18 10:00:55

Moving Between Registers

Time of First Successful Submission: 2026-04-18 10:13:21

Loading From Memory

Time of First Successful Submission: 2026-04-18 12:13:51

More Loading Practice

Time of First Successful Submission: 2026-04-18 12:16:30

Dereferencing Pointers

Time of First Successful Submission: 2026-04-18 12:30:35

Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

Time of First Successful Submission: 2026-04-18 12:53:51

Double Dereference

Time of First Successful Submission: 2026-04-18 13:13:06

The Stack

Time of First Successful Submission: 2026-04-19 09:14:54

Stack Offsets

Time of First Successful Submission: 2026-04-19 09:46:11

Program Arguments on the Stack

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Popping From the Stack

Time of First Successful Submission: 2026-04-19 10:01:50

Disassembling Programs

Time of First Successful Submission: 2026-04-19 15:42:35

Tracing Syscalls

Time of First Successful Submission: 2026-04-19 16:12:47

Starting GDB

Time of First Successful Submission: 2026-04-19 16:19:52

Quitting GDB

Time of First Successful Submission: 2026-04-19 16:20:44

Starting Programs in GDB

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Disassembling in GDB

Time of First Successful Submission: 2026-04-19 16:26:40

Stepping Through Instructions

Time of First Successful Submission: 2026-04-19 16:29:54

Reading Register Values

Time of First Successful Submission: 2026-04-19 16:34:45

Popping Stack Values

Time of First Successful Submission: 2026-04-19 16:42:48

Examining Memory

Time of First Successful Submission: 2026-04-19 16:46:57

Examining Stack Pointers

Time of First Successful Submission: 2026-04-19 16:51:39

Cooperative Debugging

Time of First Successful Submission: 2026-04-19 17:17:36

Writing Output

Time of First Successful Submission: 2026-04-21 08:50:52

Chaining Syscalls

Time of First Successful Submission: 2026-04-21 09:07:09

Writing Strings

Time of First Successful Submission: 2026-04-21 09:28:39

Reading Data

Time of First Successful Submission: 2026-04-21 11:31:17

Opening Files

Time of First Successful Submission: 2026-04-21 11:51:21

Hardcoding the Filename

Time of First Successful Submission: 2026-04-21 12:12:34

Comparing Values

Time of First Successful Submission: 2026-04-21 14:21:02

Comparing Characters

Time of First Successful Submission: 2026-04-21 14:37:08

Conditional Control Flow

Time of First Successful Submission: 2026-04-21 15:18:44

Comparing Strings

Time of First Successful Submission: 2026-04-21 15:37:59

Reverse the Password

Time of First Successful Submission: 2026-04-21 15:51:09

Conditionals Without Conditionals

Time of First Successful Submission: 2026-04-22 13:23:41

Looping

Time of First Successful Submission: 2026-04-22 13:41:01

Reverse the Calculation

Time of First Successful Submission: 2026-04-22 14:07:47

Reverse the Reverse

Time of First Successful Submission: 2026-04-22 14:09:28

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-04-22 14:29:06

Loops on Data

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set-register

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set-multiple-registers

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add-to-register

Time of First Successful Submission: 2026-04-23 12:40:21

linear-equation-registers

Time of First Successful Submission: 2026-04-23 12:48:04

integer-division

Time of First Successful Submission: 2026-04-23 13:22:27

modulo-operation

Time of First Successful Submission: 2026-04-23 14:07:36

set-upper-byte

Time of First Successful Submission: 2026-04-23 14:23:32

efficient-modulo

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byte-extraction

Time of First Successful Submission: 2026-04-23 15:22:23

bitwise-and

Time of First Successful Submission: 2026-04-26 08:19:08

check-even

Time of First Successful Submission: 2026-04-26 08:28:30

memory-read

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memory-write

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memory-increment

Time of First Successful Submission: 2026-04-26 08:53:29

byte-access

Time of First Successful Submission: 2026-04-27 13:59:40

memory-size-access

Time of First Successful Submission: 2026-04-27 17:33:53

little-endian-write

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memory-sum

Time of First Successful Submission: 2026-04-27 17:44:59

stack-subtraction

Time of First Successful Submission: 2026-04-27 17:55:42

swap-stack-values

Time of First Successful Submission: 2026-04-27 18:01:48

average-stack-values

Time of First Successful Submission: 2026-04-27 18:11:57

absolute-jump

Time of First Successful Submission: 2026-04-27 18:39:53

relative-jump

Time of First Successful Submission: 2026-04-27 19:05:56

jump-trampoline

Time of First Successful Submission: 2026-04-28 12:38:46

conditional-jump

Time of First Successful Submission: 2026-04-28 13:32:14

indirect-jump

Time of First Successful Submission: 2026-04-28 15:04:05

average-loop

Time of First Successful Submission: 2026-04-29 12:04:05

count-non-zero

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string-lower

Time of First Successful Submission: 2026-04-29 15:52:42

most-common-byte

Time of First Successful Submission: 2026-04-30 16:31:35

Exit

Time of First Successful Submission: 2026-05-01 16:15:24

Socket

Time of First Successful Submission: 2026-05-01 18:43:52

Bind

Time of First Successful Submission: 2026-05-02 12:36:55

Listen

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Accept

Time of First Successful Submission: 2026-05-02 14:26:49

Static Response

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Dynamic Response

Time of First Successful Submission: 2026-05-03 17:28:39

Iterative GET Server

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Concurrent GET Server

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Concurrent POST Server

Time of First Successful Submission: 2026-05-04 16:11:52

Web Server

Time of First Successful Submission: 2026-05-04 16:21:48

Debugging Programs

Time of First Successful Submission: 2026-05-04 16:27:37

Inspecting Registers

Time of First Successful Submission: 2026-05-04 16:34:31

Examining Memory

Time of First Successful Submission: 2026-05-05 16:12:58

Setting Breakpoints

Time of First Successful Submission: 2026-05-07 13:19:48

GDB Scripting

Time of First Successful Submission: 2026-05-07 14:39:41

Modifying Data

Time of First Successful Submission: 2026-05-08 09:50:23

Modifying Execution

Time of First Successful Submission: 2026-05-08 11:18:59

Broken Functions

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-05-08 12:23:04

... and again!

Time of First Successful Submission: 2026-05-08 12:23:55

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-04-07 14:39:11

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-07 14:46:06

Using the GUI Desktop

Time of First Successful Submission: 2026-04-07 14:50:14

Pasting into the Desktop

Time of First Successful Submission: 2026-04-07 14:52:59

Connecting over SSH

Time of First Successful Submission: 2026-04-07 17:28:08

Restarting Challenges

Time of First Successful Submission: 2026-04-07 17:37:11

Challenge Programs

Time of First Successful Submission: 2026-04-07 17:45:10

The Flag File

Time of First Successful Submission: 2026-04-07 17:53:37

Using Privileged Mode

Time of First Successful Submission: 2026-04-07 18:05:52

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-07 18:09:20

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-07 18:10:01