Alexandru

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2025-10-06 19:01:33

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

Time of First Successful Submission: 2025-10-06 19:08:37

Changing to an Absolute Path

Time of First Successful Submission: 2025-10-06 19:12:13

Relative Paths

Time of First Successful Submission: 2025-10-06 19:18:15

Cat

Time of First Successful Submission: 2025-10-20 18:46:34

Ls

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Ls All

Time of First Successful Submission: 2025-10-20 19:37:35

Find

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Piping Echo

Time of First Successful Submission: 2025-11-10 17:20:42

Piping Stdout

Time of First Successful Submission: 2025-11-10 17:21:55

Piping Stdin

Time of First Successful Submission: 2025-11-10 17:26:31


Intro to Cybersecurity

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level1

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level2

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level3

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level4

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level5

Time of First Successful Submission: 2025-11-23 18:42:14

level6

Time of First Successful Submission: 2025-11-23 18:43:46

level7

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level8

Time of First Successful Submission: 2025-11-23 18:49:21

level9

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level10

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level11

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level12

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level13

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level14

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level15

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level16

Time of First Successful Submission: 2025-11-23 19:11:35


Start Here

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Using the Terminal

Time of First Successful Submission: 2025-10-06 18:29:46

Using the VSCode Workspace

Time of First Successful Submission: 2025-10-06 18:31:23

Using the GUI Desktop

Time of First Successful Submission: 2025-10-06 18:35:21

Pasting into the Desktop

Time of First Successful Submission: 2025-10-06 18:38:34

Restarting Challenges

Time of First Successful Submission: 2025-10-06 18:43:02

Challenge Programs

Time of First Successful Submission: 2025-10-06 17:43:56

The Flag File

Time of First Successful Submission: 2025-10-06 17:46:07

Using Privileged Mode

Time of First Successful Submission: 2025-10-06 18:01:25

Persistent Home Directories - One

Time of First Successful Submission: 2025-10-06 18:05:58

Persistent Home Directories - Two

Time of First Successful Submission: 2025-10-06 18:11:00


Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2025-10-06 19:01:33

Intro to Arguments

Time of First Successful Submission: 2025-10-06 19:02:08

Command History

Time of First Successful Submission: 2025-10-06 19:02:48

The Root

Time of First Successful Submission: 2025-10-06 19:04:03

Program and absolute paths

Time of First Successful Submission: 2025-10-06 19:05:14

Position thy self

Time of First Successful Submission: 2025-10-06 19:08:37

Position elsewhere

Time of First Successful Submission: 2025-10-06 19:12:13

implicit relative paths, from /

Time of First Successful Submission: 2025-10-06 19:18:15

explicit relative paths, from /

Time of First Successful Submission: 2025-10-06 19:19:03

implicit relative path

Time of First Successful Submission: 2025-10-06 19:19:55

home sweet home

Time of First Successful Submission: 2025-10-06 19:21:41

cat: not the pet, but the command!

Time of First Successful Submission: 2025-10-20 18:46:34

catting absolute paths

Time of First Successful Submission: 2025-10-20 18:48:35

more catting practice

Time of First Successful Submission: 2025-10-20 18:52:01

grepping for a needle in a haystack

Time of First Successful Submission: 2025-10-20 18:53:46

comparing files

Time of First Successful Submission: 2025-10-20 18:56:23

listing files

Time of First Successful Submission: 2025-10-20 19:00:14

touching files

Time of First Successful Submission: 2025-10-20 19:01:38

removing files

Time of First Successful Submission: 2025-10-20 19:08:56

moving files

Time of First Successful Submission: 2025-10-20 19:36:35

copying files

Time of First Successful Submission: 2025-11-10 16:41:45

hidden files

Time of First Successful Submission: 2025-10-20 19:37:35

An Epic Filesystem Quest

Time of First Successful Submission: 2025-10-20 19:51:39

making directories

Time of First Successful Submission: 2025-10-20 19:52:57

finding files

Time of First Successful Submission: 2025-10-20 20:02:05

linking files

Time of First Successful Submission: 2025-10-20 20:04:07

Learning From Documentation

Time of First Successful Submission: 2025-11-10 16:42:40

Learning Complex Usage

Time of First Successful Submission: 2025-11-10 16:43:33

Reading Manuals

Time of First Successful Submission: 2025-11-10 16:45:44

Searching Manuals

Time of First Successful Submission: 2025-11-10 16:52:04

Searching For Manuals

Time of First Successful Submission: 2025-11-10 17:00:46

Helpful Programs

Time of First Successful Submission: 2025-11-10 17:02:36

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

Time of First Successful Submission: 2025-11-10 17:26:31

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: 2025-11-10 17:37:42

Writing to multiple programs

Time of First Successful Submission: 2025-11-10 17:39:50

Split-piping stderr and stdout

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Named pipes

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Printing Variables

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Setting Variables

Time of First Successful Submission: 2025-11-10 17:44:33

Multi-word Variables

Time of First Successful Submission: 2025-11-10 17:45:17

Exporting Variables

Time of First Successful Submission: 2025-11-10 17:46:30

Printing Exported Variables

Time of First Successful Submission: 2025-11-10 17:47:19

Storing Command Output

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Reading Input

Time of First Successful Submission: 2025-11-10 17:50:00

Reading Files

Time of First Successful Submission: 2025-11-10 17:50:36

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: 2025-11-10 19:08:19

Using sudo

Time of First Successful Submission: 2025-11-10 19:13:29

Changing File Ownership

Time of First Successful Submission: 2025-11-10 19:20:17

Groups and Files

Time of First Successful Submission: 2025-11-10 19:23:03

Fun With Groups Names

Time of First Successful Submission: 2025-11-10 19:24:22

Changing Permissions

Time of First Successful Submission: 2025-11-10 19:25:28

Executable Files

Time of First Successful Submission: 2025-11-10 19:27:11

Permission Tweaking Practice

Time of First Successful Submission: 2025-11-10 19:36:40

Permissions Setting Practice

Time of First Successful Submission: 2025-11-10 19:48:27

The SUID Bit

Time of First Successful Submission: 2025-11-10 19:56:03

Chaining with Semicolons

Time of First Successful Submission: 2025-11-10 19:59:07

Building on Success

Time of First Successful Submission: 2025-11-10 20:00:25

Handling Failure

Time of First Successful Submission: 2025-11-10 20:01:11

Your First Shell Script

Time of First Successful Submission: 2025-11-10 20:02:26

Redirecting Script Output

Time of First Successful Submission: 2025-11-10 20:04:24

Executable Shell Scripts

Time of First Successful Submission: 2025-11-10 20:07:04

Understanding Shebangs

Time of First Successful Submission: 2025-11-10 20:11:52

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

Time of First Successful Submission: 2025-11-10 20:30:53

Launching Screen

Time of First Successful Submission: 2025-11-10 20:34:42

Detaching and Attaching

Time of First Successful Submission: 2025-11-10 20:38:22

Finding Sessions

Time of First Successful Submission: 2025-11-10 20:39:51

Switching Windows

Time of First Successful Submission: 2025-11-10 20:41:45

Detaching and Attaching (tmux)

Time of First Successful Submission: 2025-11-10 20:42:47

Switching Windows (tmux)

Time of First Successful Submission: 2025-11-10 20:44:07

The PATH Variable

Time of First Successful Submission: 2025-11-10 20:45:12

Setting PATH

Time of First Successful Submission: 2025-11-10 20:46:04

Finding Commands

Time of First Successful Submission: 2025-11-10 20:47:20

Adding Commands

Time of First Successful Submission: 2025-11-10 20:48:11

Hijacking Commands

Time of First Successful Submission: 2025-11-10 20:49:23

Bashrc Backdoor

Time of First Successful Submission: 2025-11-10 20:50:42

Sniffing Input

Time of First Successful Submission: 2025-11-10 20:51:42

Overshared Directories

Time of First Successful Submission: 2025-11-10 20:56:29

Tricky Linking

Time of First Successful Submission: 2025-11-10 20:57:43

Sniffing Process Arguments

Time of First Successful Submission: 2025-11-10 21:01:08

Snooping on Configurations

Time of First Successful Submission: 2025-11-10 21:01:57

The Fork Bomb

Time of First Successful Submission: 2025-11-11 13:38:25

Disk-Space Doomsday

Time of First Successful Submission: 2025-11-10 21:19:57

rm -rf /

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Life after rm -rf /

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Finding meaning after rm -rf /

Time of First Successful Submission: 2025-11-10 21:32:39


GCA CTF

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Using the Terminal

Time of First Successful Submission: 2025-10-06 18:29:46

Using the VSCode Workspace

Time of First Successful Submission: 2025-10-06 18:31:23

Using the GUI Desktop

Time of First Successful Submission: 2025-10-06 18:35:21

Pasting into the Desktop

Time of First Successful Submission: 2025-10-06 18:38:34

Restarting Challenges

Time of First Successful Submission: 2025-10-06 18:43:02

Getting Help

Time of First Successful Submission: 2025-10-20 18:14:11

Challenge Programs

Time of First Successful Submission: 2025-10-06 17:43:56

The Flag File

Time of First Successful Submission: 2025-10-06 17:46:07

Using Privileged Mode

Time of First Successful Submission: 2025-10-06 18:01:25

Persistent Home Directories - One

Time of First Successful Submission: 2025-10-06 18:05:58

Persistent Home Directories - Two

Time of First Successful Submission: 2025-10-06 18:11:00