NisM

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-02-28 15:18:29

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: 2026-03-01 09:18:30

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: 2026-02-28 14:37:41

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-28 14:40:32

Using the GUI Desktop

Time of First Successful Submission: 2026-02-28 14:45:42

Pasting into the Desktop

Time of First Successful Submission: 2026-02-28 14:47:25

Restarting Challenges

Time of First Successful Submission: 2026-02-28 14:58:33

Challenge Programs

Time of First Successful Submission: 2026-02-28 15:02:41

The Flag File

Time of First Successful Submission: 2026-02-28 15:05:00

Using Privileged Mode

Time of First Successful Submission: 2026-02-28 15:09:05

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-28 15:13:16

Persistent Home Directories - Two

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


Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-02-28 15:18:29

Intro to Arguments

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Command History

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The Root

Time of First Successful Submission: 2026-02-28 15:23:06

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

Time of First Successful Submission: 2026-02-28 15:43:13

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

Time of First Successful Submission: 2026-02-28 15:56:09

hidden files

Time of First Successful Submission: 2026-02-28 15:57:20

An Epic Filesystem Quest

Time of First Successful Submission: 2026-02-28 16:06:07

making directories

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finding files

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linking files

Time of First Successful Submission: 2026-02-28 16:18:38

Learning From Documentation

Time of First Successful Submission: 2026-02-28 16:21:06

Learning Complex Usage

Time of First Successful Submission: 2026-02-28 16:22:42

Reading Manuals

Time of First Successful Submission: 2026-02-28 16:28:10

Searching Manuals

Time of First Successful Submission: 2026-02-28 16:31:53

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

Time of First Successful Submission: 2026-03-01 09:20:43

Appending output

Time of First Successful Submission: 2026-03-01 09:23:41

Redirecting errors

Time of First Successful Submission: 2026-03-01 09:27:07

Redirecting input

Time of First Successful Submission: 2026-03-01 09:29:25

Grepping stored results

Time of First Successful Submission: 2026-03-01 09:31:08

Grepping live output

Time of First Successful Submission: 2026-03-01 09:32:05

Grepping errors

Time of First Successful Submission: 2026-03-01 09:34:10

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: 2026-03-01 09:42:17

Process substitution for input

Time of First Successful Submission: 2026-03-01 09:46:12

Writing to multiple programs

Time of First Successful Submission: 2026-03-01 09:51:18

Split-piping stderr and stdout

Time of First Successful Submission: 2026-03-01 10:00:02

Named pipes

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Printing Variables

Time of First Successful Submission: 2026-03-01 10:12:07

Setting Variables

Time of First Successful Submission: 2026-03-01 10:13:52

Multi-word Variables

Time of First Successful Submission: 2026-03-01 10:14:59

Exporting Variables

Time of First Successful Submission: 2026-03-01 10:18:28

Printing Exported Variables

Time of First Successful Submission: 2026-03-01 10:19:25

Storing Command Output

Time of First Successful Submission: 2026-03-01 10:21:50

Reading Input

Time of First Successful Submission: 2026-03-01 10:25:14

Reading Files

Time of First Successful Submission: 2026-03-01 10:27:35

Translating characters

Time of First Successful Submission: 2026-03-01 10:33:49

Deleting characters

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Deleting newlines

Time of First Successful Submission: 2026-03-01 10:36:59

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

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Killing Processes

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Interrupting Processes

Time of First Successful Submission: 2026-03-01 10:56:25

Killing Misbehaving Processes

Time of First Successful Submission: 2026-03-01 11:00:07

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: 2026-03-01 11:55:34

Using sudo

Time of First Successful Submission: 2026-03-01 11:59:05

Changing File Ownership

Time of First Successful Submission: 2026-03-01 12:04:15

Groups and Files

Time of First Successful Submission: 2026-03-01 12:08:55

Fun With Groups Names

Time of First Successful Submission: 2026-03-01 12:09:59

Changing Permissions

Time of First Successful Submission: 2026-03-01 12:16:10

Executable Files

Time of First Successful Submission: 2026-03-01 12:20:01

Permission Tweaking Practice

Time of First Successful Submission: 2026-03-01 12:29:38

Permissions Setting Practice

Time of First Successful Submission: 2026-03-01 12:37:18

The SUID Bit

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Chaining with Semicolons

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Building on Success

Time of First Successful Submission: 2026-03-01 12:50:16

Handling Failure

Time of First Successful Submission: 2026-03-01 12:53:42

Your First Shell Script

Time of First Successful Submission: 2026-03-01 13:00:47

Redirecting Script Output

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Executable Shell Scripts

Time of First Successful Submission: 2026-03-01 13:04:52

Understanding Shebangs

Time of First Successful Submission: 2026-03-01 13:08:21

Scripting with Arguments

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Scripting with Conditionals

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Scripting with Default Cases

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Scripting with Multiple Conditions

Time of First Successful Submission: 2026-03-01 13:18:32

Reading Shell Scripts

Time of First Successful Submission: 2026-03-01 13:21:45

Launching Screen

Time of First Successful Submission: 2026-03-01 13:23:38

Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-03-01 13:27:43

Switching Windows

Time of First Successful Submission: 2026-03-01 13:29:42

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-03-01 13:31:09

Switching Windows (tmux)

Time of First Successful Submission: 2026-03-01 13:32:39

The PATH Variable

Time of First Successful Submission: 2026-03-01 13:36:22

Setting PATH

Time of First Successful Submission: 2026-03-01 13:38:16

Finding Commands

Time of First Successful Submission: 2026-03-01 13:39:50

Adding Commands

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Hijacking Commands

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Bashrc Backdoor

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Sniffing Input

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Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

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Snooping on Configurations

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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 /

Time of First Successful Submission: 2026-03-04 18:18:56


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: 2026-03-08 16:04:33

Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-03-08 16:20:27

More Loading Practice

Time of First Successful Submission: 2026-03-08 16:27:34

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

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Popping From the Stack

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Disassembling Programs

Time of First Successful Submission: 2026-03-14 14:45:55

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

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Reading Register Values

Time of First Successful Submission: 2026-03-14 15:02:12

Popping Stack Values

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Examining Memory

Time of First Successful Submission: 2026-03-14 15:08:17

Examining Stack Pointers

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Cooperative Debugging

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Writing Output

Time of First Successful Submission: 2026-03-15 06:41:20

Chaining Syscalls

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Writing Strings

Time of First Successful Submission: 2026-03-15 06:47:06

Reading Data

Time of First Successful Submission: 2026-03-15 07:05:45

Opening Files

Time of First Successful Submission: 2026-03-15 07:39:17

Hardcoding the Filename

Time of First Successful Submission: 2026-03-15 07:49:25

Comparing Values

Time of First Successful Submission: 2026-03-15 10:04:54

Comparing Characters

Time of First Successful Submission: 2026-03-15 10:08:27

Conditional Control Flow

Time of First Successful Submission: 2026-03-15 10:15:27

Comparing Strings

Time of First Successful Submission: 2026-03-15 10:19:33

Reverse the Password

Time of First Successful Submission: 2026-03-15 10:28:29

Conditionals Without Conditionals

Time of First Successful Submission: 2026-03-15 11:00:41

Looping

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Reverse the Calculation

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Reverse the Reverse

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Dealing with Bitwise Operations

Time of First Successful Submission: 2026-03-15 11:24:13

Loops on Data

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-03-08 17:40:54

... and again!

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Newline Troubles

Time of First Successful Submission: 2026-03-08 17:54:24

Reasoning about files

Time of First Successful Submission: 2026-03-08 18:30:17

Specifying Filenames

Time of First Successful Submission: 2026-03-08 18:33:12

Binary and Hex Encoding

Time of First Successful Submission: 2026-03-11 16:22:47

More Hex

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Decoding Hex

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Decoding Practice

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Encoding Practice

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Hex-encoding ASCII

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Nested Encoding

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Hex-encoding UTF-8

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UTF Mixups

Time of First Successful Submission: 2026-03-11 20:45:17

Modifying Encoded Data

Time of First Successful Submission: 2026-03-12 08:47:58

Decoding Base64

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Encoding Base64

Time of First Successful Submission: 2026-03-12 19:26:46

Dealing with Obfuscation

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Dealing with Obfuscation 2

Time of First Successful Submission: 2026-03-14 13:57:31


GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-02-28 14:37:41

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-28 14:40:32

Using the GUI Desktop

Time of First Successful Submission: 2026-02-28 14:45:42

Pasting into the Desktop

Time of First Successful Submission: 2026-02-28 14:47:25

Connecting over SSH

Time of First Successful Submission: 2026-02-28 14:52:31

Restarting Challenges

Time of First Successful Submission: 2026-02-28 14:58:33

Getting Help

Time of First Successful Submission: 2026-02-28 15:01:16

Challenge Programs

Time of First Successful Submission: 2026-02-28 15:02:41

The Flag File

Time of First Successful Submission: 2026-02-28 15:05:00

Using Privileged Mode

Time of First Successful Submission: 2026-02-28 15:09:05

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-28 15:13:16

Persistent Home Directories - Two

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