DoomerStone

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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

Time of First Successful Submission: 2026-05-08 00:33:38

Piping Stdout

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Piping Stdin

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Start Here

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Challenge Programs

Time of First Successful Submission: 2026-05-07 00:23:16

The Flag File

Time of First Successful Submission: 2026-05-07 00:26:44

Using Privileged Mode

Time of First Successful Submission: 2026-05-07 00:29:47

Persistent Home Directories - One

Time of First Successful Submission: 2026-05-07 00:32:10

Persistent Home Directories - Two

Time of First Successful Submission: 2026-05-07 00:33:00


Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-05-07 00:39:28

Intro to Arguments

Time of First Successful Submission: 2026-05-07 00:40:15

Command History

Time of First Successful Submission: 2026-05-07 00:40:54

The Root

Time of First Successful Submission: 2026-05-07 00:45:13

Program and absolute paths

Time of First Successful Submission: 2026-05-07 00:47:35

Position thy self

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Position elsewhere

Time of First Successful Submission: 2026-05-07 00:50:13

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

Time of First Successful Submission: 2026-05-07 01:00:45

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

Time of First Successful Submission: 2026-05-18 13:59:28

linking files

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Learning From Documentation

Time of First Successful Submission: 2026-05-18 14:02:22

Learning Complex Usage

Time of First Successful Submission: 2026-05-18 14:04:53

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: 2026-05-12 11:12:49

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: 2026-05-14 10:53:34

Groups and Files

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Fun With Groups Names

Time of First Successful Submission: 2026-05-14 10:59:28

Changing Permissions

Time of First Successful Submission: 2026-05-14 11:01:58

Executable Files

Time of First Successful Submission: 2026-05-14 11:09:13

Permission Tweaking Practice

Time of First Successful Submission: 2026-05-14 11:19:41

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

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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

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Switching Windows

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Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-05-13 23:06:10

Switching Windows (tmux)

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The PATH Variable

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Setting PATH

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Finding Commands

Time of First Successful Submission: 2026-05-13 23:12:12

Adding Commands

Time of First Successful Submission: 2026-05-13 23:18:35

Hijacking Commands

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Bashrc Backdoor

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Sniffing Input

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Overshared Directories

Time of First Successful Submission: 2026-05-16 12:14:02

Tricky Linking

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Sniffing Process Arguments

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Snooping on Configurations

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The Fork Bomb

Time of First Successful Submission: 2026-05-18 12:48:04

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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DSU Cyber Camps

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Challenge Programs

Time of First Successful Submission: 2026-05-07 00:23:16

The Flag File

Time of First Successful Submission: 2026-05-07 00:26:44

Using Privileged Mode

Time of First Successful Submission: 2026-05-07 00:29:47

Persistent Home Directories - One

Time of First Successful Submission: 2026-05-07 00:32:10

Persistent Home Directories - Two

Time of First Successful Submission: 2026-05-07 00:33:00


GCA CTF

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Challenge Programs

Time of First Successful Submission: 2026-05-07 00:23:16

The Flag File

Time of First Successful Submission: 2026-05-07 00:26:44

Using Privileged Mode

Time of First Successful Submission: 2026-05-07 00:29:47

Persistent Home Directories - One

Time of First Successful Submission: 2026-05-07 00:32:10

Persistent Home Directories - Two

Time of First Successful Submission: 2026-05-07 00:33:00