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Intro to Programming Languages

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P1.0 Level 1 Open /flag in VSCode

Time of First Successful Submission: 2026-02-27 23:08:43

Commands

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

Command Arguments

Time of First Successful Submission: 2026-02-11 22:19:23

Command History

Time of First Successful Submission: 2026-02-11 22:20:27

The Root Path

Time of First Successful Submission: 2026-02-11 23:11:01

Absolute Paths

Time of First Successful Submission: 2026-02-12 08:35:18

Changing position

Time of First Successful Submission: 2026-02-12 08:46:01

Changing to an Absolute Path

Time of First Successful Submission: 2026-02-12 08:49:53

Relative Paths

Time of First Successful Submission: 2026-02-12 09:00:04

Cat

Time of First Successful Submission: 2026-02-12 09:25:52

Ls

Time of First Successful Submission: 2026-02-12 10:24:24

Ls All

Time of First Successful Submission: 2026-02-12 10:38:07

Find

Time of First Successful Submission: 2026-02-12 10:53:23

Piping Echo

Time of First Successful Submission: 2026-02-16 18:57:02

Piping Stdout

Time of First Successful Submission: 2026-02-16 19:01:25

Piping Stdin

Time of First Successful Submission: 2026-02-16 19:58:17

Start Here

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Using the Terminal

Time of First Successful Submission: 2026-02-11 14:31:50

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-11 14:34:51

Using the GUI Desktop

Time of First Successful Submission: 2026-02-11 14:39:13

Pasting into the Desktop

Time of First Successful Submission: 2026-02-11 14:40:59

Restarting Challenges

Time of First Successful Submission: 2026-02-11 15:56:22

Challenge Programs

Time of First Successful Submission: 2026-02-11 22:44:42

The Flag File

Time of First Successful Submission: 2026-02-11 22:38:48

Using Privileged Mode

Time of First Successful Submission: 2026-02-11 22:35:54

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-11 22:55:06

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-11 23:02:53

Linux Luminarium

128 / 128 2119 / 31322

Intro to Commands

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

Intro to Arguments

Time of First Successful Submission: 2026-02-11 22:19:23

Command History

Time of First Successful Submission: 2026-02-11 22:20:27

The Root

Time of First Successful Submission: 2026-02-11 23:11:01

Program and absolute paths

Time of First Successful Submission: 2026-02-12 08:35:18

Position thy self

Time of First Successful Submission: 2026-02-12 08:46:01

Position elsewhere

Time of First Successful Submission: 2026-02-12 08:49:53

implicit relative paths, from /

Time of First Successful Submission: 2026-02-12 09:00:04

explicit relative paths, from /

Time of First Successful Submission: 2026-02-12 09:04:56

implicit relative path

Time of First Successful Submission: 2026-02-12 09:17:07

home sweet home

Time of First Successful Submission: 2026-02-12 09:23:06

cat: not the pet, but the command!

Time of First Successful Submission: 2026-02-12 09:25:52

catting absolute paths

Time of First Successful Submission: 2026-02-12 09:26:27

more catting practice

Time of First Successful Submission: 2026-02-12 09:29:28

grepping for a needle in a haystack

Time of First Successful Submission: 2026-02-12 09:31:16

comparing files

Time of First Successful Submission: 2026-02-12 10:21:31

listing files

Time of First Successful Submission: 2026-02-12 10:24:24

touching files

Time of First Successful Submission: 2026-02-12 10:27:03

removing files

Time of First Successful Submission: 2026-02-12 10:29:07

moving files

Time of First Successful Submission: 2026-02-12 10:33:51

copying files

Time of First Successful Submission: 2026-02-12 10:36:02

hidden files

Time of First Successful Submission: 2026-02-12 10:38:07

An Epic Filesystem Quest

Time of First Successful Submission: 2026-02-12 10:46:15

making directories

Time of First Successful Submission: 2026-02-12 10:47:39

finding files

Time of First Successful Submission: 2026-02-12 10:53:23

linking files

Time of First Successful Submission: 2026-02-12 12:59:44

Learning From Documentation

Time of First Successful Submission: 2026-02-12 14:00:16

Learning Complex Usage

Time of First Successful Submission: 2026-02-12 14:17:24

Reading Manuals

Time of First Successful Submission: 2026-02-12 14:25:46

Searching Manuals

Time of First Successful Submission: 2026-02-12 14:29:31

Searching For Manuals

Time of First Successful Submission: 2026-02-12 14:48:47

Helpful Programs

Time of First Successful Submission: 2026-02-12 14:56:16

Help for Builtins

Time of First Successful Submission: 2026-02-12 14:58:16

Matching with *

Time of First Successful Submission: 2026-02-15 21:45:43

Matching with ?

Time of First Successful Submission: 2026-02-15 22:01:55

Matching with []

Time of First Successful Submission: 2026-02-15 22:05:41

Matching paths with []

Time of First Successful Submission: 2026-02-15 22:11:33

Multiple globs

Time of First Successful Submission: 2026-02-15 22:13:49

Mixing globs

Time of First Successful Submission: 2026-02-16 17:21:52

Exclusionary globbing

Time of First Successful Submission: 2026-02-16 17:07:36

Tab completion

Time of First Successful Submission: 2026-02-16 17:11:39

Multiple options for tab completion

Time of First Successful Submission: 2026-02-16 17:17:14

Tab completion on commands

Time of First Successful Submission: 2026-02-16 17:19:10

Redirecting output

Time of First Successful Submission: 2026-02-16 18:57:02

Redirecting more output

Time of First Successful Submission: 2026-02-16 19:01:25

Appending output

Time of First Successful Submission: 2026-02-16 19:04:03

Redirecting errors

Time of First Successful Submission: 2026-02-16 19:08:28

Redirecting input

Time of First Successful Submission: 2026-02-16 19:58:17

Grepping stored results

Time of First Successful Submission: 2026-02-16 20:46:22

Grepping live output

Time of First Successful Submission: 2026-02-16 20:50:17

Grepping errors

Time of First Successful Submission: 2026-02-16 21:04:18

Filtering with grep -v

Time of First Successful Submission: 2026-02-16 21:06:42

Filtering with sed

Time of First Successful Submission: 2026-02-16 21:11:56

Duplicating piped data with tee

Time of First Successful Submission: 2026-02-16 22:09:32

Process substitution for input

Time of First Successful Submission: 2026-02-16 22:29:30

Writing to multiple programs

Time of First Successful Submission: 2026-02-16 23:08:01

Split-piping stderr and stdout

Time of First Successful Submission: 2026-02-16 23:36:07

Named pipes

Time of First Successful Submission: 2026-02-16 23:55:04

Printing Variables

Time of First Successful Submission: 2026-02-17 10:36:06

Setting Variables

Time of First Successful Submission: 2026-02-17 10:41:33

Multi-word Variables

Time of First Successful Submission: 2026-02-17 10:48:17

Exporting Variables

Time of First Successful Submission: 2026-02-17 10:55:56

Printing Exported Variables

Time of First Successful Submission: 2026-02-17 10:58:02

Storing Command Output

Time of First Successful Submission: 2026-02-17 11:01:25

Reading Input

Time of First Successful Submission: 2026-02-17 11:10:47

Reading Files

Time of First Successful Submission: 2026-02-17 11:15:03

Translating characters

Time of First Successful Submission: 2026-02-17 11:34:26

Deleting characters

Time of First Successful Submission: 2026-02-17 11:41:07

Deleting newlines

Time of First Successful Submission: 2026-02-17 11:48:19

Extracting the first lines with head

Time of First Successful Submission: 2026-02-17 11:50:13

Extracting specific sections of text

Time of First Successful Submission: 2026-02-17 11:54:59

Sorting data

Time of First Successful Submission: 2026-02-17 12:01:24

Listing Processes

Time of First Successful Submission: 2026-02-17 12:31:10

Killing Processes

Time of First Successful Submission: 2026-02-17 12:42:20

Interrupting Processes

Time of First Successful Submission: 2026-02-17 12:45:10

Killing Misbehaving Processes

Time of First Successful Submission: 2026-02-17 12:59:10

Suspending Processes

Time of First Successful Submission: 2026-02-17 13:00:31

Resuming Processes

Time of First Successful Submission: 2026-02-17 13:01:58

Backgrounding Processes

Time of First Successful Submission: 2026-02-17 13:06:46

Foregrounding Processes

Time of First Successful Submission: 2026-02-17 13:11:56

Starting Backgrounded Processes

Time of First Successful Submission: 2026-02-17 13:45:00

Process Exit Codes

Time of First Successful Submission: 2026-02-17 13:49:48

Becoming root with su

Time of First Successful Submission: 2026-02-17 14:25:00

Other users with su

Time of First Successful Submission: 2026-02-17 14:26:49

Cracking passwords

Time of First Successful Submission: 2026-02-17 14:32:46

Using sudo

Time of First Successful Submission: 2026-02-17 14:38:44

Changing File Ownership

Time of First Successful Submission: 2026-02-17 17:58:08

Groups and Files

Time of First Successful Submission: 2026-02-17 18:17:49

Fun With Groups Names

Time of First Successful Submission: 2026-02-17 18:24:32

Changing Permissions

Time of First Successful Submission: 2026-02-17 18:57:32

Executable Files

Time of First Successful Submission: 2026-02-17 19:00:01

Permission Tweaking Practice

Time of First Successful Submission: 2026-02-17 20:58:24

Permissions Setting Practice

Time of First Successful Submission: 2026-02-17 21:43:54

The SUID Bit

Time of First Successful Submission: 2026-02-17 21:54:31

Chaining with Semicolons

Time of First Successful Submission: 2026-02-17 21:59:26

Building on Success

Time of First Successful Submission: 2026-02-17 22:06:08

Handling Failure

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

Your First Shell Script

Time of First Successful Submission: 2026-02-17 22:22:39

Redirecting Script Output

Time of First Successful Submission: 2026-02-17 22:32:54

Executable Shell Scripts

Time of First Successful Submission: 2026-02-17 22:40:55

Understanding Shebangs

Time of First Successful Submission: 2026-02-17 22:51:15

Scripting with Arguments

Time of First Successful Submission: 2026-02-17 22:57:01

Scripting with Conditionals

Time of First Successful Submission: 2026-02-17 23:14:17

Scripting with Default Cases

Time of First Successful Submission: 2026-02-17 23:22:31

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-02-17 23:25:58

Reading Shell Scripts

Time of First Successful Submission: 2026-02-17 23:27:33

Launching Screen

Time of First Successful Submission: 2026-02-17 23:29:43

Detaching and Attaching

Time of First Successful Submission: 2026-02-17 23:32:41

Finding Sessions

Time of First Successful Submission: 2026-02-17 23:34:35

Switching Windows

Time of First Successful Submission: 2026-02-17 23:47:29

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-02-17 23:52:11

Switching Windows (tmux)

Time of First Successful Submission: 2026-02-18 00:01:06

The PATH Variable

Time of First Successful Submission: 2026-02-18 10:20:26

Setting PATH

Time of First Successful Submission: 2026-02-18 10:33:31

Finding Commands

Time of First Successful Submission: 2026-02-18 10:36:46

Adding Commands

Time of First Successful Submission: 2026-02-18 10:50:30

Hijacking Commands

Time of First Successful Submission: 2026-02-18 11:00:58

Bashrc Backdoor

Time of First Successful Submission: 2026-02-18 11:21:37

Sniffing Input

Time of First Successful Submission: 2026-02-18 12:00:38

Overshared Directories

Time of First Successful Submission: 2026-02-18 12:39:32

Tricky Linking

Time of First Successful Submission: 2026-02-18 13:49:46

Sniffing Process Arguments

Time of First Successful Submission: 2026-02-18 13:56:47

Snooping on Configurations

Time of First Successful Submission: 2026-02-18 14:11:38

The Fork Bomb

Time of First Successful Submission: 2026-02-18 14:49:35

Disk-Space Doomsday

Time of First Successful Submission: 2026-02-18 15:20:58

rm -rf /

Time of First Successful Submission: 2026-02-18 15:27:13

Life after rm -rf /

Time of First Successful Submission: 2026-02-18 15:49:11

Finding meaning after rm -rf /

Time of First Successful Submission: 2026-02-18 15:55:36

Computing 101

84 / 94 436 / 21049

Your First Register

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

Your First Syscall

Time of First Successful Submission: 2026-02-18 17:32:11

Exit Codes

Time of First Successful Submission: 2026-02-18 19:15:21

Building Executables

Time of First Successful Submission: 2026-02-18 19:37:54

Moving Between Registers

Time of First Successful Submission: 2026-02-18 20:26:38

Loading From Memory

Time of First Successful Submission: 2026-02-19 08:53:35

More Loading Practice

Time of First Successful Submission: 2026-02-19 11:39:16

Dereferencing Pointers

Time of First Successful Submission: 2026-02-19 17:03:08

Dereferencing Yourself

Time of First Successful Submission: 2026-02-19 17:24:26

Dereferencing with Offsets

Time of First Successful Submission: 2026-02-19 17:49:34

Stored Addresses

Time of First Successful Submission: 2026-02-19 18:01:22

Double Dereference

Time of First Successful Submission: 2026-02-19 19:18:52

The Stack

Time of First Successful Submission: 2026-02-20 07:54:37

Stack Offsets

Time of First Successful Submission: 2026-02-20 08:40:58

Program Arguments on the Stack

Time of First Successful Submission: 2026-02-20 09:39:16

Popping From the Stack

Time of First Successful Submission: 2026-02-20 11:28:07

Disassembling Programs

Time of First Successful Submission: 2026-02-21 09:19:43

Tracing Syscalls

Time of First Successful Submission: 2026-02-21 10:24:15

Starting GDB

Time of First Successful Submission: 2026-02-21 10:29:39

Quitting GDB

Time of First Successful Submission: 2026-02-21 10:35:53

Starting Programs in GDB

Time of First Successful Submission: 2026-02-21 10:43:31

Disassembling in GDB

Time of First Successful Submission: 2026-02-21 10:46:46

Stepping Through Instructions

Time of First Successful Submission: 2026-02-21 10:52:43

Reading Register Values

Time of First Successful Submission: 2026-02-21 10:55:36

Popping Stack Values

Time of First Successful Submission: 2026-02-21 11:13:08

Examining Memory

Time of First Successful Submission: 2026-02-21 11:37:26

Examining Stack Pointers

Time of First Successful Submission: 2026-02-21 11:52:31

Cooperative Debugging

Time of First Successful Submission: 2026-02-21 12:54:38

Writing Output

Time of First Successful Submission: 2026-02-21 15:17:57

Chaining Syscalls

Time of First Successful Submission: 2026-02-21 15:33:59

Writing Strings

Time of First Successful Submission: 2026-02-21 15:48:58

Reading Data

Time of First Successful Submission: 2026-02-21 16:22:20

Opening Files

Time of First Successful Submission: 2026-02-22 09:54:51

Hardcoding the Filename

Time of First Successful Submission: 2026-02-22 11:41:34

Comparing Values

Time of First Successful Submission: 2026-02-22 16:34:44

Comparing Characters

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

Conditional Control Flow

Time of First Successful Submission: 2026-02-22 18:57:47

Comparing Strings

Time of First Successful Submission: 2026-02-22 19:15:42

Reverse the Password

Time of First Successful Submission: 2026-02-22 19:47:13

Conditionals Without Conditionals

Time of First Successful Submission: 2026-02-22 22:31:52

Looping

Time of First Successful Submission: 2026-02-23 18:32:01

Reverse the Calculation

Time of First Successful Submission: 2026-02-23 20:24:05

Reverse the Reverse

Time of First Successful Submission: 2026-02-23 21:12:10

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-02-23 22:35:31

Loops on Data

Time of First Successful Submission: 2026-02-23 22:57:13

set-register

Time of First Successful Submission: 2026-02-24 11:32:32

set-multiple-registers

Time of First Successful Submission: 2026-02-24 11:48:27

add-to-register

Time of First Successful Submission: 2026-02-24 12:19:13

linear-equation-registers

Time of First Successful Submission: 2026-02-24 13:09:59

integer-division

Time of First Successful Submission: 2026-02-24 13:38:47

modulo-operation

Time of First Successful Submission: 2026-02-24 13:52:30

set-upper-byte

Time of First Successful Submission: 2026-02-24 14:04:51

efficient-modulo

Time of First Successful Submission: 2026-02-24 14:33:07

byte-extraction

Time of First Successful Submission: 2026-02-24 15:46:19

bitwise-and

Time of First Successful Submission: 2026-02-24 16:08:46

check-even

Time of First Successful Submission: 2026-02-25 11:49:41

memory-read

Time of First Successful Submission: 2026-02-25 12:22:56

memory-write

Time of First Successful Submission: 2026-02-25 12:27:47

memory-increment

Time of First Successful Submission: 2026-02-25 13:04:38

byte-access

Time of First Successful Submission: 2026-02-25 14:24:04

memory-size-access

Time of First Successful Submission: 2026-02-25 14:38:19

little-endian-write

Time of First Successful Submission: 2026-02-25 15:12:36

memory-sum

Time of First Successful Submission: 2026-02-25 15:36:41

stack-subtraction

Time of First Successful Submission: 2026-02-25 15:54:01

swap-stack-values

Time of First Successful Submission: 2026-02-25 16:06:44

average-stack-values

Time of First Successful Submission: 2026-02-25 16:28:46

absolute-jump

Time of First Successful Submission: 2026-02-25 18:44:23

relative-jump

Time of First Successful Submission: 2026-02-25 19:37:51

jump-trampoline

Time of First Successful Submission: 2026-02-25 19:46:38

conditional-jump

Time of First Successful Submission: 2026-02-26 16:19:21

indirect-jump

Time of First Successful Submission: 2026-02-27 21:36:01

average-loop

Time of First Successful Submission: 2026-02-27 22:55:01

count-non-zero

Time of First Successful Submission: 2026-02-28 08:44:58

string-lower

Time of First Successful Submission: 2026-03-01 14:07:24

most-common-byte

Time of First Successful Submission: 2026-03-01 14:23:48

Exit

Time of First Successful Submission: 2026-03-01 14:28:30

Socket

Time of First Successful Submission: 2026-03-01 16:37:54

Bind

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

Listen

Time of First Successful Submission: 2026-03-04 13:28:39

Accept

Time of First Successful Submission: 2026-03-04 13:49:09

Static Response

Time of First Successful Submission: 2026-03-05 23:32:43

Dynamic Response

Time of First Successful Submission: 2026-03-06 15:43:57

Iterative GET Server

Time of First Successful Submission: 2026-03-09 18:58:59

Concurrent GET Server

Time of First Successful Submission: 2026-03-10 08:32:55

Playing With Programs

12 / 116 17011 / 23085

What's the password?

Time of First Successful Submission: 2026-02-21 20:45:20

... and again!

Time of First Successful Submission: 2026-02-21 20:46:18

Newline Troubles

Time of First Successful Submission: 2026-03-12 18:53:34

Reasoning about files

Time of First Successful Submission: 2026-03-12 19:06:47

Specifying Filenames

Time of First Successful Submission: 2026-03-13 01:19:55

cat

Time of First Successful Submission: 2026-02-18 00:05:40

more

Time of First Successful Submission: 2026-02-18 16:02:49

less

Time of First Successful Submission: 2026-02-18 16:03:29

tail

Time of First Successful Submission: 2026-02-18 16:03:58

head

Time of First Successful Submission: 2026-02-18 16:04:15

sort

Time of First Successful Submission: 2026-02-18 16:04:32

vim

Time of First Successful Submission: 2026-02-18 16:05:32

GCA CTF

12 / 104 1449 / 42207

Using the Terminal

Time of First Successful Submission: 2026-02-11 14:31:50

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-11 14:34:51

Using the GUI Desktop

Time of First Successful Submission: 2026-02-11 14:39:13

Pasting into the Desktop

Time of First Successful Submission: 2026-02-11 14:40:59

Connecting over SSH

Time of First Successful Submission: 2026-02-11 15:47:19

Restarting Challenges

Time of First Successful Submission: 2026-02-11 15:56:22

Getting Help

Time of First Successful Submission: 2026-02-11 22:29:45

Challenge Programs

Time of First Successful Submission: 2026-02-11 22:44:42

The Flag File

Time of First Successful Submission: 2026-02-11 22:38:48

Using Privileged Mode

Time of First Successful Submission: 2026-02-11 22:35:54

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-11 22:55:06

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-11 23:02:53

Hanto Dojo

6 / 44 95 / 311

Evaluating Is Fun!

Time of First Successful Submission: 2026-02-26 23:10:13

Variables Are Fun!

Time of First Successful Submission: 2026-02-26 23:19:54

Functions Are Fun!

Time of First Successful Submission: 2026-02-26 23:21:12

Printing Is Fun!

Time of First Successful Submission: 2026-02-26 23:22:55

Opening Is Fun!

Time of First Successful Submission: 2026-02-26 23:29:29

Globals Are Fun!

Time of First Successful Submission: 2026-02-26 23:50:42