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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-02-18 15:47:01

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

Time of First Successful Submission: 2026-02-18 16:09:35

Changing to an Absolute Path

Time of First Successful Submission: 2026-02-18 16:11:58

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: 2026-02-19 16:11:49

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: 2026-02-17 18:36:22

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-17 18:39:07

Using the GUI Desktop

Time of First Successful Submission: 2026-02-17 18:42:17

Pasting into the Desktop

Time of First Successful Submission: 2026-02-17 18:44:20

Restarting Challenges

Time of First Successful Submission: 2026-02-17 18:51:30

Challenge Programs

Time of First Successful Submission: 2026-02-17 18:58:12

The Flag File

Time of First Successful Submission: 2026-02-17 19:02:41

Using Privileged Mode

Time of First Successful Submission: 2026-02-17 19:05:43

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-17 19:08:07

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-17 19:08:55

Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-02-18 15:47:01

Intro to Arguments

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Command History

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The Root

Time of First Successful Submission: 2026-02-18 15:55:13

Program and absolute paths

Time of First Successful Submission: 2026-02-18 16:05:24

Position thy self

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Position elsewhere

Time of First Successful Submission: 2026-02-18 16:11:58

implicit relative paths, from /

Time of First Successful Submission: 2026-02-18 16:21:26

explicit relative paths, from /

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implicit relative path

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home sweet home

Time of First Successful Submission: 2026-02-18 16:28:20

cat: not the pet, but the command!

Time of First Successful Submission: 2026-02-18 16:54:10

catting absolute paths

Time of First Successful Submission: 2026-02-18 16:56:07

more catting practice

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grepping for a needle in a haystack

Time of First Successful Submission: 2026-02-18 16:58:36

comparing files

Time of First Successful Submission: 2026-02-18 17:00:55

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

Time of First Successful Submission: 2026-02-18 17:08:45

hidden files

Time of First Successful Submission: 2026-02-18 17:11:15

An Epic Filesystem Quest

Time of First Successful Submission: 2026-02-18 17:21:07

making directories

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finding files

Time of First Successful Submission: 2026-02-18 17:33:21

linking files

Time of First Successful Submission: 2026-02-18 17:45:06

Learning From Documentation

Time of First Successful Submission: 2026-02-18 17:59:30

Learning Complex Usage

Time of First Successful Submission: 2026-02-18 18:02:29

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: 2026-02-19 16:11:49

Redirecting more output

Time of First Successful Submission: 2026-02-19 16:14:36

Appending output

Time of First Successful Submission: 2026-02-19 16:16:49

Redirecting errors

Time of First Successful Submission: 2026-02-19 16:20:33

Redirecting input

Time of First Successful Submission: 2026-02-19 16:22:52

Grepping stored results

Time of First Successful Submission: 2026-02-19 16:27:33

Grepping live output

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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: 2026-02-19 16:41:02

Process substitution for input

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Writing to multiple programs

Time of First Successful Submission: 2026-02-19 16:56:44

Split-piping stderr and stdout

Time of First Successful Submission: 2026-02-19 17:24:18

Named pipes

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Printing Variables

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Setting Variables

Time of First Successful Submission: 2026-02-19 17:40:00

Multi-word Variables

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Exporting Variables

Time of First Successful Submission: 2026-02-19 17:44:08

Printing Exported Variables

Time of First Successful Submission: 2026-02-19 17:44:56

Storing Command Output

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Reading Input

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Reading Files

Time of First Successful Submission: 2026-02-19 17:51:09

Translating characters

Time of First Successful Submission: 2026-02-19 18:25:57

Deleting characters

Time of First Successful Submission: 2026-02-19 18:27:01

Deleting newlines

Time of First Successful Submission: 2026-02-19 18:28:47

Extracting the first lines with head

Time of First Successful Submission: 2026-02-19 18:30:31

Extracting specific sections of text

Time of First Successful Submission: 2026-02-19 18:32:48

Sorting data

Time of First Successful Submission: 2026-02-19 18:34:11

Listing Processes

Time of First Successful Submission: 2026-02-20 14:04:51

Killing Processes

Time of First Successful Submission: 2026-02-20 14:08:42

Interrupting Processes

Time of First Successful Submission: 2026-02-20 14:11:20

Killing Misbehaving Processes

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Suspending Processes

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Resuming Processes

Time of First Successful Submission: 2026-02-20 14:28:22

Backgrounding Processes

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Foregrounding Processes

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Starting Backgrounded Processes

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Process Exit Codes

Time of First Successful Submission: 2026-02-20 14:38:09

Becoming root with su

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Other users with su

Time of First Successful Submission: 2026-02-20 17:28:22

Cracking passwords

Time of First Successful Submission: 2026-02-20 17:36:28

Using sudo

Time of First Successful Submission: 2026-02-20 17:39:56

Changing File Ownership

Time of First Successful Submission: 2026-02-20 17:51:28

Groups and Files

Time of First Successful Submission: 2026-02-20 18:02:07

Fun With Groups Names

Time of First Successful Submission: 2026-02-20 18:04:26

Changing Permissions

Time of First Successful Submission: 2026-02-20 18:12:12

Executable Files

Time of First Successful Submission: 2026-02-20 18:14:25

Permission Tweaking Practice

Time of First Successful Submission: 2026-02-20 18:25:38

Permissions Setting Practice

Time of First Successful Submission: 2026-02-20 18:33:25

The SUID Bit

Time of First Successful Submission: 2026-02-20 18:35:55

Chaining with Semicolons

Time of First Successful Submission: 2026-02-20 19:57:07

Building on Success

Time of First Successful Submission: 2026-02-20 19:59:23

Handling Failure

Time of First Successful Submission: 2026-02-20 20:00:33

Your First Shell Script

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

Redirecting Script Output

Time of First Successful Submission: 2026-02-20 20:06:57

Executable Shell Scripts

Time of First Successful Submission: 2026-02-20 20:09:08

Understanding Shebangs

Time of First Successful Submission: 2026-02-20 20:19:22

Scripting with Arguments

Time of First Successful Submission: 2026-02-20 20:22:44

Scripting with Conditionals

Time of First Successful Submission: 2026-02-20 20:26:43

Scripting with Default Cases

Time of First Successful Submission: 2026-02-20 20:29:00

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-02-20 20:31:43

Reading Shell Scripts

Time of First Successful Submission: 2026-02-20 20:34:59

Launching Screen

Time of First Successful Submission: 2026-02-21 14:42:54

Detaching and Attaching

Time of First Successful Submission: 2026-02-21 14:45:26

Finding Sessions

Time of First Successful Submission: 2026-02-21 14:56:18

Switching Windows

Time of First Successful Submission: 2026-02-21 14:58:28

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-02-21 14:59:55

Switching Windows (tmux)

Time of First Successful Submission: 2026-02-21 15:01:27

The PATH Variable

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

Setting PATH

Time of First Successful Submission: 2026-02-21 15:21:50

Finding Commands

Time of First Successful Submission: 2026-02-21 15:23:24

Adding Commands

Time of First Successful Submission: 2026-02-21 15:28:24

Hijacking Commands

Time of First Successful Submission: 2026-02-21 15:45:55

Bashrc Backdoor

Time of First Successful Submission: 2026-02-21 15:52:44

Sniffing Input

Time of First Successful Submission: 2026-02-21 16:45:07

Overshared Directories

Time of First Successful Submission: 2026-02-21 17:07:19

Tricky Linking

Time of First Successful Submission: 2026-02-21 17:23:20

Sniffing Process Arguments

Time of First Successful Submission: 2026-02-21 17:32:51

Snooping on Configurations

Time of First Successful Submission: 2026-02-21 17:36:05

The Fork Bomb

Time of First Successful Submission: 2026-02-21 17:55:39

Disk-Space Doomsday

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rm -rf /

Time of First Successful Submission: 2026-02-21 18:10:21

Life after rm -rf /

Time of First Successful Submission: 2026-02-21 18:19:22

Finding meaning after rm -rf /

Time of First Successful Submission: 2026-02-21 18:24:26

Computing 101

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Your First Register

Time of First Successful Submission: 2026-02-22 09:51:37

Your First Syscall

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Exit Codes

Time of First Successful Submission: 2026-02-22 09:57:39

Building Executables

Time of First Successful Submission: 2026-02-22 10:05:22

Moving Between Registers

Time of First Successful Submission: 2026-02-22 10:11:33

Loading From Memory

Time of First Successful Submission: 2026-02-22 10:39:12

More Loading Practice

Time of First Successful Submission: 2026-02-22 10:40:25

Dereferencing Pointers

Time of First Successful Submission: 2026-02-22 10:45:23

Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

Time of First Successful Submission: 2026-02-22 10:58:21

Double Dereference

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

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

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Disassembling Programs

Time of First Successful Submission: 2026-02-22 14:54:46

Tracing Syscalls

Time of First Successful Submission: 2026-02-22 14:58:39

Starting GDB

Time of First Successful Submission: 2026-02-22 15:00:13

Quitting GDB

Time of First Successful Submission: 2026-02-22 15:00:58

Starting Programs in GDB

Time of First Successful Submission: 2026-02-22 15:03:13

Disassembling in GDB

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Stepping Through Instructions

Time of First Successful Submission: 2026-02-22 15:07:05

Reading Register Values

Time of First Successful Submission: 2026-02-22 15:08:04

Popping Stack Values

Time of First Successful Submission: 2026-02-22 15:09:33

Examining Memory

Time of First Successful Submission: 2026-02-22 15:11:10

Examining Stack Pointers

Time of First Successful Submission: 2026-02-22 15:13:32

Cooperative Debugging

Time of First Successful Submission: 2026-02-22 15:21:00

Writing Output

Time of First Successful Submission: 2026-02-22 15:49:27

Chaining Syscalls

Time of First Successful Submission: 2026-02-22 15:50:34

Writing Strings

Time of First Successful Submission: 2026-02-22 15:51:32

Reading Data

Time of First Successful Submission: 2026-02-22 15:56:49

Opening Files

Time of First Successful Submission: 2026-02-22 16:08:24

Hardcoding the Filename

Time of First Successful Submission: 2026-02-22 16:11:45

Comparing Values

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

Comparing Characters

Time of First Successful Submission: 2026-02-22 17:09:37

Conditional Control Flow

Time of First Successful Submission: 2026-02-22 17:15:02

Comparing Strings

Time of First Successful Submission: 2026-02-22 17:18:11

Reverse the Password

Time of First Successful Submission: 2026-02-22 17:23:27

Conditionals Without Conditionals

Time of First Successful Submission: 2026-02-22 17:34:10

Looping

Time of First Successful Submission: 2026-02-22 17:41:47

Reverse the Calculation

Time of First Successful Submission: 2026-02-22 17:48:30

Reverse the Reverse

Time of First Successful Submission: 2026-02-22 17:49:38

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-02-22 17:51:51

Loops on Data

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set-register

Time of First Successful Submission: 2026-02-23 08:04:37

set-multiple-registers

Time of First Successful Submission: 2026-02-23 08:06:55

add-to-register

Time of First Successful Submission: 2026-02-23 08:09:08

linear-equation-registers

Time of First Successful Submission: 2026-02-23 08:14:52

integer-division

Time of First Successful Submission: 2026-02-23 08:19:15

modulo-operation

Time of First Successful Submission: 2026-02-23 08:21:19

set-upper-byte

Time of First Successful Submission: 2026-02-23 08:23:24

efficient-modulo

Time of First Successful Submission: 2026-02-23 08:30:14

byte-extraction

Time of First Successful Submission: 2026-02-23 08:38:41

bitwise-and

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check-even

Time of First Successful Submission: 2026-02-23 08:53:51

memory-read

Time of First Successful Submission: 2026-02-23 09:06:03

memory-write

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

memory-increment

Time of First Successful Submission: 2026-02-23 09:10:32

byte-access

Time of First Successful Submission: 2026-02-23 09:13:15

memory-size-access

Time of First Successful Submission: 2026-02-23 09:18:12

little-endian-write

Time of First Successful Submission: 2026-02-23 09:24:47

memory-sum

Time of First Successful Submission: 2026-02-23 09:28:05

stack-subtraction

Time of First Successful Submission: 2026-02-23 09:30:58

swap-stack-values

Time of First Successful Submission: 2026-02-23 09:32:25

average-stack-values

Time of First Successful Submission: 2026-02-23 09:35:40

absolute-jump

Time of First Successful Submission: 2026-02-23 09:39:09

relative-jump

Time of First Successful Submission: 2026-02-23 09:45:16

jump-trampoline

Time of First Successful Submission: 2026-02-23 14:31:41

conditional-jump

Time of First Successful Submission: 2026-02-23 14:56:32

indirect-jump

Time of First Successful Submission: 2026-02-23 15:26:32

average-loop

Time of First Successful Submission: 2026-02-23 15:36:10

count-non-zero

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string-lower

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most-common-byte

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Exit

Time of First Successful Submission: 2026-02-23 17:49:32

Socket

Time of First Successful Submission: 2026-02-23 18:03:32

Bind

Time of First Successful Submission: 2026-02-24 09:22:14

Listen

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Accept

Time of First Successful Submission: 2026-02-24 09:32:23

Static Response

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Dynamic Response

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Iterative GET Server

Time of First Successful Submission: 2026-02-24 10:56:02

Concurrent GET Server

Time of First Successful Submission: 2026-02-24 11:11:14

Concurrent POST Server

Time of First Successful Submission: 2026-02-24 15:00:43

Web Server

Time of First Successful Submission: 2026-02-24 15:30:39

Debugging Programs

Time of First Successful Submission: 2026-02-24 15:40:51

Inspecting Registers

Time of First Successful Submission: 2026-02-24 15:43:04

Examining Memory

Time of First Successful Submission: 2026-02-24 15:53:30

Setting Breakpoints

Time of First Successful Submission: 2026-02-24 16:04:48

GDB Scripting

Time of First Successful Submission: 2026-02-24 16:34:44

Modifying Data

Time of First Successful Submission: 2026-02-24 17:17:43

Modifying Execution

Time of First Successful Submission: 2026-02-24 17:27:05

Broken Functions

Time of First Successful Submission: 2026-02-24 17:49:33

Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-02-24 17:57:59

... and again!

Time of First Successful Submission: 2026-02-24 17:58:41

Newline Troubles

Time of First Successful Submission: 2026-02-24 18:02:12

Reasoning about files

Time of First Successful Submission: 2026-02-24 18:06:11

Specifying Filenames

Time of First Successful Submission: 2026-02-24 18:08:51

Binary and Hex Encoding

Time of First Successful Submission: 2026-02-24 18:36:23

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-02-17 18:36:22

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-17 18:39:07

Using the GUI Desktop

Time of First Successful Submission: 2026-02-17 18:42:17

Pasting into the Desktop

Time of First Successful Submission: 2026-02-17 18:44:20

Connecting over SSH

Time of First Successful Submission: 2026-02-17 18:48:39

Restarting Challenges

Time of First Successful Submission: 2026-02-17 18:51:30

Getting Help

Time of First Successful Submission: 2026-02-17 18:56:05

Challenge Programs

Time of First Successful Submission: 2026-02-17 18:58:12

The Flag File

Time of First Successful Submission: 2026-02-17 19:02:41

Using Privileged Mode

Time of First Successful Submission: 2026-02-17 19:05:43

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-17 19:08:07

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-17 19:08:55