faker

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-03-06 13:14:59

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: 2026-03-06 11:13:24

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-06 11:16:28

Using the GUI Desktop

Time of First Successful Submission: 2026-03-06 11:18:27

Pasting into the Desktop

Time of First Successful Submission: 2026-03-06 11:20:02

Restarting Challenges

Time of First Successful Submission: 2026-03-06 12:48:28

Challenge Programs

Time of First Successful Submission: 2026-03-06 12:54:22

The Flag File

Time of First Successful Submission: 2026-03-06 12:59:01

Using Privileged Mode

Time of First Successful Submission: 2026-03-06 13:05:47

Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-03-06 13:09:17

Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-03-06 13:14:59

Intro to Arguments

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Command History

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The Root

Time of First Successful Submission: 2026-03-06 13:18:39

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

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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

Time of First Successful Submission: 2026-03-06 22:07:42

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

Time of First Successful Submission: 2026-03-07 09:55:43

Printing Exported Variables

Time of First Successful Submission: 2026-03-07 09:56:30

Storing Command Output

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Reading Input

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Reading Files

Time of First Successful Submission: 2026-03-07 10:20:31

Translating characters

Time of First Successful Submission: 2026-03-07 10:28:40

Deleting characters

Time of First Successful Submission: 2026-03-07 11:58:23

Deleting newlines

Time of First Successful Submission: 2026-03-07 12:01:06

Extracting the first lines with head

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Extracting specific sections of text

Time of First Successful Submission: 2026-03-07 12:15:22

Sorting data

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Listing Processes

Time of First Successful Submission: 2026-03-07 12:25:33

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: 2026-03-07 17:28:07

Using sudo

Time of First Successful Submission: 2026-03-07 17:32:40

Changing File Ownership

Time of First Successful Submission: 2026-03-07 17:37:22

Groups and Files

Time of First Successful Submission: 2026-03-07 17:55:03

Fun With Groups Names

Time of First Successful Submission: 2026-03-07 17:56:44

Changing Permissions

Time of First Successful Submission: 2026-03-07 18:04:24

Executable Files

Time of First Successful Submission: 2026-03-07 18:07:18

Permission Tweaking Practice

Time of First Successful Submission: 2026-03-07 18:17:10

Permissions Setting Practice

Time of First Successful Submission: 2026-03-07 18:26:54

The SUID Bit

Time of First Successful Submission: 2026-03-07 18:29:29

Chaining with Semicolons

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Building on Success

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Handling Failure

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Your First Shell Script

Time of First Successful Submission: 2026-03-07 22:37:01

Redirecting Script Output

Time of First Successful Submission: 2026-03-07 22:40:08

Executable Shell Scripts

Time of First Successful Submission: 2026-03-07 22:41:46

Understanding Shebangs

Time of First Successful Submission: 2026-03-07 22:44:04

Scripting with Arguments

Time of First Successful Submission: 2026-03-08 14:23:38

Scripting with Conditionals

Time of First Successful Submission: 2026-03-08 14:27:59

Scripting with Default Cases

Time of First Successful Submission: 2026-03-08 14:30:42

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-03-08 14:33:14

Reading Shell Scripts

Time of First Successful Submission: 2026-03-08 14:34:54

Launching Screen

Time of First Successful Submission: 2026-03-08 14:36:02

Detaching and Attaching

Time of First Successful Submission: 2026-03-08 14:37:41

Finding Sessions

Time of First Successful Submission: 2026-03-08 14:39:11

Switching Windows

Time of First Successful Submission: 2026-03-08 14:40:38

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-03-08 14:41:39

Switching Windows (tmux)

Time of First Successful Submission: 2026-03-08 14:43:48

The PATH Variable

Time of First Successful Submission: 2026-03-08 14:51:46

Setting PATH

Time of First Successful Submission: 2026-03-08 15:00:07

Finding Commands

Time of First Successful Submission: 2026-03-08 15:15:20

Adding Commands

Time of First Successful Submission: 2026-03-08 15:26:57

Hijacking Commands

Time of First Successful Submission: 2026-03-08 15:33:13

Bashrc Backdoor

Time of First Successful Submission: 2026-03-08 15:48:47

Sniffing Input

Time of First Successful Submission: 2026-03-08 15:58:09

Overshared Directories

Time of First Successful Submission: 2026-03-08 16:02:35

Tricky Linking

Time of First Successful Submission: 2026-03-08 16:31:42

Sniffing Process Arguments

Time of First Successful Submission: 2026-03-08 16:54:36

Snooping on Configurations

Time of First Successful Submission: 2026-03-08 16:58:20

The Fork Bomb

Time of First Successful Submission: 2026-03-08 17:15:39

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: 2026-03-08 17:51:20

Computing 101

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Your First Register

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Your First Syscall

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Exit Codes

Time of First Successful Submission: 2026-03-08 18:19:20

Building Executables

Time of First Successful Submission: 2026-03-08 18:33:00

Moving Between Registers

Time of First Successful Submission: 2026-03-08 18:41:50

Loading From Memory

Time of First Successful Submission: 2026-03-09 11:40:07

More Loading Practice

Time of First Successful Submission: 2026-03-09 15:28:25

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

Time of First Successful Submission: 2026-03-09 16:39:13

Popping From the Stack

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Disassembling Programs

Time of First Successful Submission: 2026-03-09 17:04:58

Tracing Syscalls

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Starting GDB

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Quitting GDB

Time of First Successful Submission: 2026-03-09 17:25:39

Starting Programs in GDB

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Disassembling in GDB

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Stepping Through Instructions

Time of First Successful Submission: 2026-03-09 17:31:05

Reading Register Values

Time of First Successful Submission: 2026-03-09 17:35:55

Popping Stack Values

Time of First Successful Submission: 2026-03-09 17:38:19

Examining Memory

Time of First Successful Submission: 2026-03-09 17:41:15

Examining Stack Pointers

Time of First Successful Submission: 2026-03-09 17:44:26

Cooperative Debugging

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Writing Output

Time of First Successful Submission: 2026-03-09 20:57:07

Chaining Syscalls

Time of First Successful Submission: 2026-03-09 21:29:41

Writing Strings

Time of First Successful Submission: 2026-03-09 21:30:56

Reading Data

Time of First Successful Submission: 2026-03-09 21:56:52

Opening Files

Time of First Successful Submission: 2026-03-09 22:49:26

Hardcoding the Filename

Time of First Successful Submission: 2026-03-09 23:01:37

Comparing Values

Time of First Successful Submission: 2026-03-10 17:24:09

Comparing Characters

Time of First Successful Submission: 2026-03-10 19:28:33

Conditional Control Flow

Time of First Successful Submission: 2026-03-11 09:31:26

Comparing Strings

Time of First Successful Submission: 2026-03-11 09:58:27

Reverse the Password

Time of First Successful Submission: 2026-03-11 10:13:35

Conditionals Without Conditionals

Time of First Successful Submission: 2026-03-11 11:46:32

Looping

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Reverse the Calculation

Time of First Successful Submission: 2026-03-11 12:02:39

Reverse the Reverse

Time of First Successful Submission: 2026-03-11 13:09:43

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-03-11 13:21:24

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

Time of First Successful Submission: 2026-03-11 17:36:29

memory-size-access

Time of First Successful Submission: 2026-03-11 17:43:07

little-endian-write

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memory-sum

Time of First Successful Submission: 2026-03-11 18:14:14

stack-subtraction

Time of First Successful Submission: 2026-03-11 19:35:11

swap-stack-values

Time of First Successful Submission: 2026-03-11 19:37:10

average-stack-values

Time of First Successful Submission: 2026-03-11 19:47:19

absolute-jump

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relative-jump

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jump-trampoline

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conditional-jump

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

indirect-jump

Time of First Successful Submission: 2026-03-11 23:13:34

average-loop

Time of First Successful Submission: 2026-03-12 09:22:31

count-non-zero

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string-lower

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most-common-byte

Time of First Successful Submission: 2026-03-13 18:57:38

Exit

Time of First Successful Submission: 2026-03-13 19:34:15

Socket

Time of First Successful Submission: 2026-03-13 22:49:11

Bind

Time of First Successful Submission: 2026-03-13 23:42:32

Listen

Time of First Successful Submission: 2026-03-15 16:02:12

Accept

Time of First Successful Submission: 2026-03-15 16:19:05

Static Response

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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: 2026-03-16 14:19:54

Web Server

Time of First Successful Submission: 2026-03-16 14:26:35

Debugging Programs

Time of First Successful Submission: 2026-03-16 14:31:35

Inspecting Registers

Time of First Successful Submission: 2026-03-16 14:37:27

Examining Memory

Time of First Successful Submission: 2026-03-16 14:48:07

Setting Breakpoints

Time of First Successful Submission: 2026-03-16 18:44:42

GDB Scripting

Time of First Successful Submission: 2026-03-16 20:16:57

Modifying Data

Time of First Successful Submission: 2026-03-16 20:30:03

Modifying Execution

Time of First Successful Submission: 2026-03-16 21:53:04

Broken Functions

Time of First Successful Submission: 2026-03-16 22:13:10

Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-03-16 22:17:43

... and again!

Time of First Successful Submission: 2026-03-16 22:19:07

Newline Troubles

Time of First Successful Submission: 2026-03-16 22:22:57

Reasoning about files

Time of First Successful Submission: 2026-03-16 22:28:28

Specifying Filenames

Time of First Successful Submission: 2026-03-16 22:29:52

GCA CTF

12 / 104 1778 / 42399

Using the Terminal

Time of First Successful Submission: 2026-03-06 11:13:24

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-06 11:16:28

Using the GUI Desktop

Time of First Successful Submission: 2026-03-06 11:18:27

Pasting into the Desktop

Time of First Successful Submission: 2026-03-06 11:20:02

Connecting over SSH

Time of First Successful Submission: 2026-03-06 12:45:28

Restarting Challenges

Time of First Successful Submission: 2026-03-06 12:48:28

Getting Help

Time of First Successful Submission: 2026-03-06 12:51:37

Challenge Programs

Time of First Successful Submission: 2026-03-06 12:54:22

The Flag File

Time of First Successful Submission: 2026-03-06 12:59:01

Using Privileged Mode

Time of First Successful Submission: 2026-03-06 13:05:47

Persistent Home Directories - One

Time of First Successful Submission: 2026-03-06 13:08:20

Persistent Home Directories - Two

Time of First Successful Submission: 2026-03-06 13:09:17