phasmid

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Intro to Programming Languages

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Commands

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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: 2026-04-15 19:32:27

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-15 19:33:49

Using the GUI Desktop

Time of First Successful Submission: 2026-04-15 19:38:49

Pasting into the Desktop

Time of First Successful Submission: 2026-04-15 19:41:10

Restarting Challenges

Time of First Successful Submission: 2026-04-15 19:49:12

Challenge Programs

Time of First Successful Submission: 2026-04-15 19:56:18

The Flag File

Time of First Successful Submission: 2026-04-15 19:57:16

Using Privileged Mode

Time of First Successful Submission: 2026-04-15 20:01:51

Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-15 20:07:03

Linux Luminarium

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Intro to Commands

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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

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Redirecting errors

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Redirecting input

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Grepping stored results

Time of First Successful Submission: 2026-04-17 14:29:42

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: 2026-04-17 15:03:21

Process substitution for input

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Writing to multiple programs

Time of First Successful Submission: 2026-04-17 15:19:33

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

Time of First Successful Submission: 2026-04-18 00:40:12

Using sudo

Time of First Successful Submission: 2026-04-18 00:43:41

Changing File Ownership

Time of First Successful Submission: 2026-04-19 03:35:49

Groups and Files

Time of First Successful Submission: 2026-04-19 03:42:38

Fun With Groups Names

Time of First Successful Submission: 2026-04-19 03:44:19

Changing Permissions

Time of First Successful Submission: 2026-04-19 03:48:22

Executable Files

Time of First Successful Submission: 2026-04-19 03:49:59

Permission Tweaking Practice

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Permissions Setting Practice

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The SUID Bit

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Chaining with Semicolons

Time of First Successful Submission: 2026-04-20 02:07:57

Building on Success

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Handling Failure

Time of First Successful Submission: 2026-04-20 02:13:39

Your First Shell Script

Time of First Successful Submission: 2026-04-20 02:16:56

Redirecting Script Output

Time of First Successful Submission: 2026-04-20 02:28:01

Executable Shell Scripts

Time of First Successful Submission: 2026-04-20 02:30:15

Understanding Shebangs

Time of First Successful Submission: 2026-04-20 02:34:05

Scripting with Arguments

Time of First Successful Submission: 2026-04-20 02:37:24

Scripting with Conditionals

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Scripting with Default Cases

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Scripting with Multiple Conditions

Time of First Successful Submission: 2026-04-20 02:44:52

Reading Shell Scripts

Time of First Successful Submission: 2026-04-20 02:46:12

Launching Screen

Time of First Successful Submission: 2026-04-20 02:49:37

Detaching and Attaching

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Finding Sessions

Time of First Successful Submission: 2026-04-20 02:55:12

Switching Windows

Time of First Successful Submission: 2026-04-20 02:57:23

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-20 02:59:01

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-20 03:00:40

The PATH Variable

Time of First Successful Submission: 2026-04-20 03:06:02

Setting PATH

Time of First Successful Submission: 2026-04-20 03:07:31

Finding Commands

Time of First Successful Submission: 2026-04-20 03:08:49

Adding Commands

Time of First Successful Submission: 2026-04-20 03:13:33

Hijacking Commands

Time of First Successful Submission: 2026-04-20 03:19:03

Bashrc Backdoor

Time of First Successful Submission: 2026-04-21 03:23:34

Sniffing Input

Time of First Successful Submission: 2026-04-21 03:30:06

Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

Time of First Successful Submission: 2026-04-21 03:52:19

Snooping on Configurations

Time of First Successful Submission: 2026-04-21 03:54:22

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: 2026-04-23 03:20:31

Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-04-27 01:48:30

More Loading Practice

Time of First Successful Submission: 2026-04-27 01:52:50

Dereferencing Pointers

Time of First Successful Submission: 2026-04-27 01:59:41

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: 2026-04-29 01:01:54

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: 2026-04-29 01:23:45

Popping Stack Values

Time of First Successful Submission: 2026-04-29 01:25:15

Examining Memory

Time of First Successful Submission: 2026-04-29 01:27:25

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

Time of First Successful Submission: 2026-04-29 02:26:58

Reading Data

Time of First Successful Submission: 2026-04-29 02:40:57

Opening Files

Time of First Successful Submission: 2026-04-29 02:48:38

Hardcoding the Filename

Time of First Successful Submission: 2026-04-29 03:01:10

Comparing Values

Time of First Successful Submission: 2026-05-01 04:24:49

Comparing Characters

Time of First Successful Submission: 2026-05-02 01:17:39

Conditional Control Flow

Time of First Successful Submission: 2026-05-02 01:36:51

Comparing Strings

Time of First Successful Submission: 2026-05-02 01:46:41

Reverse the Password

Time of First Successful Submission: 2026-05-02 01:55:58

Conditionals Without Conditionals

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Looping

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Reverse the Calculation

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Reverse the Reverse

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Dealing with Bitwise Operations

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Loops on Data

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set-register

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set-multiple-registers

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add-to-register

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linear-equation-registers

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integer-division

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modulo-operation

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set-upper-byte

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efficient-modulo

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byte-extraction

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bitwise-and

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check-even

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memory-read

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memory-write

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memory-increment

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byte-access

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memory-size-access

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little-endian-write

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memory-sum

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stack-subtraction

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swap-stack-values

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average-stack-values

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absolute-jump

Time of First Successful Submission: 2026-05-04 23:09:51

relative-jump

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jump-trampoline

Time of First Successful Submission: 2026-05-05 01:09:39

conditional-jump

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indirect-jump

Time of First Successful Submission: 2026-05-05 16:55:24

average-loop

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count-non-zero

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string-lower

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most-common-byte

Time of First Successful Submission: 2026-05-06 16:48:37

Exit

Time of First Successful Submission: 2026-05-08 19:42:39

Socket

Time of First Successful Submission: 2026-05-10 00:36:59

Bind

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Listen

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Accept

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Static Response

Time of First Successful Submission: 2026-05-14 18:52:32

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-04-15 19:32:27

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-15 19:33:49

Using the GUI Desktop

Time of First Successful Submission: 2026-04-15 19:38:49

Pasting into the Desktop

Time of First Successful Submission: 2026-04-15 19:41:10

Connecting over SSH

Time of First Successful Submission: 2026-04-15 19:44:57

Restarting Challenges

Time of First Successful Submission: 2026-04-15 19:49:12

Getting Help

Time of First Successful Submission: 2026-04-15 19:53:00

Challenge Programs

Time of First Successful Submission: 2026-04-15 19:56:18

The Flag File

Time of First Successful Submission: 2026-04-15 19:57:16

Using Privileged Mode

Time of First Successful Submission: 2026-04-15 20:01:51

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-15 20:04:12

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-15 20:07:03