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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-04-18 12:49:29

Command Arguments

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Command History

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The Root Path

Time of First Successful Submission: 2026-04-18 13:03:52

Absolute Paths

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Changing position

Time of First Successful Submission: 2026-04-18 13:08:31

Changing to an Absolute Path

Time of First Successful Submission: 2026-04-18 13:10:40

Relative Paths

Time of First Successful Submission: 2026-04-18 13:12:21

Cat

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Ls

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Ls All

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Find

Time of First Successful Submission: 2026-04-18 16:17:47

Piping Echo

Time of First Successful Submission: 2026-04-19 11:33:10

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: 2026-04-18 09:57:36

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-18 10:02:23

Using the GUI Desktop

Time of First Successful Submission: 2026-04-18 10:05:03

Pasting into the Desktop

Time of First Successful Submission: 2026-04-18 10:07:51

Restarting Challenges

Time of First Successful Submission: 2026-04-18 11:35:37

Challenge Programs

Time of First Successful Submission: 2026-04-18 11:43:36

The Flag File

Time of First Successful Submission: 2026-04-18 11:48:33

Using Privileged Mode

Time of First Successful Submission: 2026-04-18 11:54:11

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-18 12:02:32

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-18 12:03:14

Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-04-18 12:49:29

Intro to Arguments

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Command History

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The Root

Time of First Successful Submission: 2026-04-18 13:03:52

Program and absolute paths

Time of First Successful Submission: 2026-04-18 13:06:47

Position thy self

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Position elsewhere

Time of First Successful Submission: 2026-04-18 13:10:40

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: 2026-04-18 13:25:48

cat: not the pet, but the command!

Time of First Successful Submission: 2026-04-18 14:32:15

catting absolute paths

Time of First Successful Submission: 2026-04-18 14:32:53

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

Time of First Successful Submission: 2026-04-18 15:01:39

touching files

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removing files

Time of First Successful Submission: 2026-04-18 15:21:22

moving files

Time of First Successful Submission: 2026-04-18 15:22:35

copying files

Time of First Successful Submission: 2026-04-18 15:24:05

hidden files

Time of First Successful Submission: 2026-04-18 15:26:55

An Epic Filesystem Quest

Time of First Successful Submission: 2026-04-18 16:06:36

making directories

Time of First Successful Submission: 2026-04-18 16:10:29

finding files

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linking files

Time of First Successful Submission: 2026-04-18 17:52:52

Learning From Documentation

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

Learning Complex Usage

Time of First Successful Submission: 2026-04-18 18:19:46

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: 2026-04-19 11:33:10

Redirecting more output

Time of First Successful Submission: 2026-04-19 11:35:18

Appending output

Time of First Successful Submission: 2026-04-19 11:37:23

Redirecting errors

Time of First Successful Submission: 2026-04-19 12:11:26

Redirecting input

Time of First Successful Submission: 2026-04-19 12:15:31

Grepping stored results

Time of First Successful Submission: 2026-04-19 12:23:49

Grepping live output

Time of First Successful Submission: 2026-04-19 12:25:39

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

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Process substitution for input

Time of First Successful Submission: 2026-04-19 12:58:42

Writing to multiple programs

Time of First Successful Submission: 2026-04-19 14:21:35

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

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Printing Exported Variables

Time of First Successful Submission: 2026-04-19 18:38:17

Storing Command Output

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Reading Input

Time of First Successful Submission: 2026-04-19 19:00:29

Reading Files

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

Translating characters

Time of First Successful Submission: 2026-04-19 19:15:55

Deleting characters

Time of First Successful Submission: 2026-04-19 19:46:39

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

Time of First Successful Submission: 2026-04-19 19:56:38

Listing Processes

Time of First Successful Submission: 2026-04-20 18:22:19

Killing Processes

Time of First Successful Submission: 2026-04-20 18:27:48

Interrupting Processes

Time of First Successful Submission: 2026-04-20 18:28:59

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: 2026-04-20 19:58:08

Using sudo

Time of First Successful Submission: 2026-04-20 20:02:36

Changing File Ownership

Time of First Successful Submission: 2026-04-21 08:53:42

Groups and Files

Time of First Successful Submission: 2026-04-21 09:00:55

Fun With Groups Names

Time of First Successful Submission: 2026-04-21 09:05:08

Changing Permissions

Time of First Successful Submission: 2026-04-21 09:41:51

Executable Files

Time of First Successful Submission: 2026-04-21 09:46:30

Permission Tweaking Practice

Time of First Successful Submission: 2026-04-21 09:52:11

Permissions Setting Practice

Time of First Successful Submission: 2026-04-21 10:01:02

The SUID Bit

Time of First Successful Submission: 2026-04-21 10:13:32

Chaining with Semicolons

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Building on Success

Time of First Successful Submission: 2026-04-21 14:50:40

Handling Failure

Time of First Successful Submission: 2026-04-21 14:52:45

Your First Shell Script

Time of First Successful Submission: 2026-04-21 15:20:03

Redirecting Script Output

Time of First Successful Submission: 2026-04-21 15:41:14

Executable Shell Scripts

Time of First Successful Submission: 2026-04-21 16:14:48

Understanding Shebangs

Time of First Successful Submission: 2026-04-21 17:03:12

Scripting with Arguments

Time of First Successful Submission: 2026-04-21 17:11:05

Scripting with Conditionals

Time of First Successful Submission: 2026-04-21 17:27:50

Scripting with Default Cases

Time of First Successful Submission: 2026-04-21 17:32:25

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-04-21 17:40:07

Reading Shell Scripts

Time of First Successful Submission: 2026-04-21 17:43:42

Launching Screen

Time of First Successful Submission: 2026-04-21 18:00:24

Detaching and Attaching

Time of First Successful Submission: 2026-04-21 18:02:57

Finding Sessions

Time of First Successful Submission: 2026-04-21 18:04:07

Switching Windows

Time of First Successful Submission: 2026-04-21 18:11:22

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-21 18:14:57

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-21 18:16:21

The PATH Variable

Time of First Successful Submission: 2026-04-21 18:27:29

Setting PATH

Time of First Successful Submission: 2026-04-21 19:42:21

Finding Commands

Time of First Successful Submission: 2026-04-21 19:49:14

Adding Commands

Time of First Successful Submission: 2026-04-21 20:04:58

Hijacking Commands

Time of First Successful Submission: 2026-04-21 20:56:08

Bashrc Backdoor

Time of First Successful Submission: 2026-04-24 10:47:24

Sniffing Input

Time of First Successful Submission: 2026-04-24 12:11:51

Overshared Directories

Time of First Successful Submission: 2026-04-24 13:28:22

Tricky Linking

Time of First Successful Submission: 2026-04-24 19:16:03

Sniffing Process Arguments

Time of First Successful Submission: 2026-04-24 19:28:54

Snooping on Configurations

Time of First Successful Submission: 2026-04-24 19:39:39

The Fork Bomb

Time of First Successful Submission: 2026-04-25 12:02:41

Disk-Space Doomsday

Time of First Successful Submission: 2026-04-26 15:13:04

rm -rf /

Time of First Successful Submission: 2026-04-27 07:44:35

Life after rm -rf /

Time of First Successful Submission: 2026-04-27 07:56:49

Finding meaning after rm -rf /

Time of First Successful Submission: 2026-04-27 08:29:33

Computing 101

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Your First Register

Time of First Successful Submission: 2026-04-27 09:29:46

Your First Syscall

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Exit Codes

Time of First Successful Submission: 2026-04-27 09:57:54

Building Executables

Time of First Successful Submission: 2026-04-27 10:29:47

Moving Between Registers

Time of First Successful Submission: 2026-04-27 10:38:40

Loading From Memory

Time of First Successful Submission: 2026-04-27 16:20:50

More Loading Practice

Time of First Successful Submission: 2026-04-27 16:24:39

Dereferencing Pointers

Time of First Successful Submission: 2026-04-27 17:16:18

Dereferencing Yourself

Time of First Successful Submission: 2026-04-27 19:48:47

Dereferencing with Offsets

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Stored Addresses

Time of First Successful Submission: 2026-04-27 20:10:36

Double Dereference

Time of First Successful Submission: 2026-04-28 08:04:23

The Stack

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Stack Offsets

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Program Arguments on the Stack

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Popping From the Stack

Time of First Successful Submission: 2026-04-28 08:54:27

Disassembling Programs

Time of First Successful Submission: 2026-04-28 09:50:17

Tracing Syscalls

Time of First Successful Submission: 2026-04-28 10:01:32

Starting GDB

Time of First Successful Submission: 2026-04-28 10:04:26

Quitting GDB

Time of First Successful Submission: 2026-04-28 10:06:05

Starting Programs in GDB

Time of First Successful Submission: 2026-04-28 10:09:46

Disassembling in GDB

Time of First Successful Submission: 2026-04-28 10:15:37

Stepping Through Instructions

Time of First Successful Submission: 2026-04-28 13:21:19

Reading Register Values

Time of First Successful Submission: 2026-04-28 13:24:31

Popping Stack Values

Time of First Successful Submission: 2026-04-28 13:30:54

Examining Memory

Time of First Successful Submission: 2026-04-28 13:39:24

Examining Stack Pointers

Time of First Successful Submission: 2026-04-28 13:47:41

Cooperative Debugging

Time of First Successful Submission: 2026-04-28 14:20:14

Writing Output

Time of First Successful Submission: 2026-04-28 21:01:04

Chaining Syscalls

Time of First Successful Submission: 2026-04-28 21:10:36

Writing Strings

Time of First Successful Submission: 2026-04-28 21:12:52

Reading Data

Time of First Successful Submission: 2026-04-28 21:41:53

Opening Files

Time of First Successful Submission: 2026-04-29 07:49:30

Hardcoding the Filename

Time of First Successful Submission: 2026-04-29 08:57:12

Comparing Values

Time of First Successful Submission: 2026-04-29 10:19:11

Comparing Characters

Time of First Successful Submission: 2026-04-29 13:24:31

Conditional Control Flow

Time of First Successful Submission: 2026-04-29 13:43:07

Comparing Strings

Time of First Successful Submission: 2026-04-29 13:56:41

Reverse the Password

Time of First Successful Submission: 2026-04-29 14:38:43

Conditionals Without Conditionals

Time of First Successful Submission: 2026-04-29 19:38:58

Looping

Time of First Successful Submission: 2026-04-29 20:00:31

Reverse the Calculation

Time of First Successful Submission: 2026-04-29 21:37:19

Reverse the Reverse

Time of First Successful Submission: 2026-04-29 21:52:24

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-04-30 08:34:32

Loops on Data

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set-register

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set-multiple-registers

Time of First Successful Submission: 2026-04-30 09:57:52

add-to-register

Time of First Successful Submission: 2026-04-30 10:14:03

linear-equation-registers

Time of First Successful Submission: 2026-04-30 10:17:36

integer-division

Time of First Successful Submission: 2026-04-30 10:32:08

modulo-operation

Time of First Successful Submission: 2026-04-30 10:41:36

set-upper-byte

Time of First Successful Submission: 2026-04-30 14:55:57

efficient-modulo

Time of First Successful Submission: 2026-04-30 15:09:21

byte-extraction

Time of First Successful Submission: 2026-04-30 17:00:48

bitwise-and

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check-even

Time of First Successful Submission: 2026-04-30 19:12:19

memory-read

Time of First Successful Submission: 2026-04-30 20:10:42

memory-write

Time of First Successful Submission: 2026-04-30 20:12:45

memory-increment

Time of First Successful Submission: 2026-04-30 21:26:30

byte-access

Time of First Successful Submission: 2026-04-30 22:14:18

memory-size-access

Time of First Successful Submission: 2026-04-30 22:44:08

little-endian-write

Time of First Successful Submission: 2026-04-30 23:17:44

memory-sum

Time of First Successful Submission: 2026-04-30 23:38:50

stack-subtraction

Time of First Successful Submission: 2026-05-01 01:11:58

swap-stack-values

Time of First Successful Submission: 2026-05-01 01:17:09

average-stack-values

Time of First Successful Submission: 2026-05-01 01:25:28

absolute-jump

Time of First Successful Submission: 2026-05-01 01:36:28

relative-jump

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

jump-trampoline

Time of First Successful Submission: 2026-05-01 03:05:21

conditional-jump

Time of First Successful Submission: 2026-05-01 12:36:46

indirect-jump

Time of First Successful Submission: 2026-05-01 14:20:34

average-loop

Time of First Successful Submission: 2026-05-01 15:26:12

count-non-zero

Time of First Successful Submission: 2026-05-01 16:00:51

string-lower

Time of First Successful Submission: 2026-05-01 18:53:12

most-common-byte

Time of First Successful Submission: 2026-05-01 22:31:31

Exit

Time of First Successful Submission: 2026-05-02 00:07:55

Socket

Time of First Successful Submission: 2026-05-02 01:35:26

Bind

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Listen

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Accept

Time of First Successful Submission: 2026-05-02 13:03:56

Static Response

Time of First Successful Submission: 2026-05-02 14:02:28

Dynamic Response

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Iterative GET Server

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Concurrent GET Server

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Concurrent POST Server

Time of First Successful Submission: 2026-05-02 20:07:53

Web Server

Time of First Successful Submission: 2026-05-02 20:52:07

Debugging Programs

Time of First Successful Submission: 2026-05-02 22:24:43

Inspecting Registers

Time of First Successful Submission: 2026-05-02 22:33:50

Examining Memory

Time of First Successful Submission: 2026-05-02 23:13:51

Setting Breakpoints

Time of First Successful Submission: 2026-05-03 00:35:34

GDB Scripting

Time of First Successful Submission: 2026-05-03 16:50:31

Modifying Data

Time of First Successful Submission: 2026-05-03 17:57:38

Modifying Execution

Time of First Successful Submission: 2026-05-03 18:01:23

Broken Functions

Time of First Successful Submission: 2026-05-03 19:09:35

Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-05-03 19:23:42

... and again!

Time of First Successful Submission: 2026-05-03 19:50:26

Newline Troubles

Time of First Successful Submission: 2026-05-03 19:59:59

Reasoning about files

Time of First Successful Submission: 2026-05-03 20:19:15

Specifying Filenames

Time of First Successful Submission: 2026-05-03 20:27:44

Binary and Hex Encoding

Time of First Successful Submission: 2026-05-03 21:47:08

More Hex

Time of First Successful Submission: 2026-05-04 08:47:07

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-04-18 09:57:36

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-18 10:02:23

Using the GUI Desktop

Time of First Successful Submission: 2026-04-18 10:05:03

Pasting into the Desktop

Time of First Successful Submission: 2026-04-18 10:07:51

Connecting over SSH

Time of First Successful Submission: 2026-04-18 10:15:31

Restarting Challenges

Time of First Successful Submission: 2026-04-18 11:35:37

Getting Help

Time of First Successful Submission: 2026-04-18 11:39:50

Challenge Programs

Time of First Successful Submission: 2026-04-18 11:43:36

The Flag File

Time of First Successful Submission: 2026-04-18 11:48:33

Using Privileged Mode

Time of First Successful Submission: 2026-04-18 11:54:11

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-18 12:02:32

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-18 12:03:14