Rupert

🐧

Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-04-04 18:28:49

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

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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: 2026-04-04 18:02:17

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-04 18:05:48

Using the GUI Desktop

Time of First Successful Submission: 2026-04-04 18:09:47

Pasting into the Desktop

Time of First Successful Submission: 2026-04-04 18:11:52

Restarting Challenges

Time of First Successful Submission: 2026-04-04 18:21:59

Challenge Programs

Time of First Successful Submission: 2026-04-09 16:45:54

The Flag File

Time of First Successful Submission: 2026-04-09 16:46:39

Using Privileged Mode

Time of First Successful Submission: 2026-04-09 17:03:13

Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-09 17:04:59

Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-04-04 18:28:49

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

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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

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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

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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

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Redirecting more output

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Appending output

Time of First Successful Submission: 2026-04-06 01:22:42

Redirecting errors

Time of First Successful Submission: 2026-04-06 01:31:15

Redirecting input

Time of First Successful Submission: 2026-04-06 01:35:48

Grepping stored results

Time of First Successful Submission: 2026-04-06 01:38:37

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

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Process substitution for input

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Writing to multiple programs

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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

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Storing Command Output

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Reading Input

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Reading Files

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Translating characters

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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

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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

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Using sudo

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Changing File Ownership

Time of First Successful Submission: 2026-04-08 13:12:02

Groups and Files

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Fun With Groups Names

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Changing Permissions

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Executable Files

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Permission Tweaking Practice

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Permissions Setting Practice

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The SUID Bit

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Chaining with Semicolons

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Building on Success

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Handling Failure

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Your First Shell Script

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Redirecting Script Output

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Executable Shell Scripts

Time of First Successful Submission: 2026-04-08 18:37:15

Understanding Shebangs

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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

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Reading Shell Scripts

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Launching Screen

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Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-04-09 13:31:39

Switching Windows

Time of First Successful Submission: 2026-04-09 13:33:20

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-09 13:35:42

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-09 13:39:15

The PATH Variable

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Setting PATH

Time of First Successful Submission: 2026-04-09 13:44:34

Finding Commands

Time of First Successful Submission: 2026-04-09 13:48:45

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 /

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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: 2026-04-10 15:45:20

Moving Between Registers

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Loading From Memory

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More Loading Practice

Time of First Successful Submission: 2026-04-10 16:49:13

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

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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

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Popping Stack Values

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Examining Memory

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Examining Stack Pointers

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Cooperative Debugging

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Writing Output

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Chaining Syscalls

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Writing Strings

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Reading Data

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Opening Files

Time of First Successful Submission: 2026-04-13 14:03:58

Hardcoding the Filename

Time of First Successful Submission: 2026-04-13 14:15:47

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-04-04 18:02:17

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-04 18:05:48

Using the GUI Desktop

Time of First Successful Submission: 2026-04-04 18:09:47

Pasting into the Desktop

Time of First Successful Submission: 2026-04-04 18:11:52

Restarting Challenges

Time of First Successful Submission: 2026-04-04 18:21:59

Challenge Programs

Time of First Successful Submission: 2026-04-09 16:45:54

The Flag File

Time of First Successful Submission: 2026-04-09 16:46:39

Using Privileged Mode

Time of First Successful Submission: 2026-04-09 17:03:13

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-09 17:04:33

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-09 17:04:59