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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: 2026-10-14 23:42:59

Using the VSCode Workspace

Time of First Successful Submission: 2026-10-14 23:45:13

Using the GUI Desktop

Time of First Successful Submission: 2026-10-14 23:46:20

Pasting into the Desktop

Time of First Successful Submission: 2026-10-14 23:47:38

Restarting Challenges

Time of First Successful Submission: 2026-10-14 23:52:31

Challenge Programs

Time of First Successful Submission: 2026-10-14 23:57:04

The Flag File

Time of First Successful Submission: 2026-10-14 23:58:19

Using Privileged Mode

Time of First Successful Submission: 2026-10-15 00:02:52

Persistent Home Directories - One

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Persistent Home Directories - Two

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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

Time of First Successful Submission: 2026-10-15 21:58:39

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

Time of First Successful Submission: 2026-10-15 23:44:17

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

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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

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Groups and Files

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Fun With Groups Names

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Changing Permissions

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Executable Files

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Permission Tweaking Practice

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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)

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Switching Windows (tmux)

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The PATH Variable

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Setting PATH

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Finding Commands

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Adding Commands

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Hijacking Commands

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Bashrc Backdoor

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Sniffing Input

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Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

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Snooping on Configurations

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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

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Moving Between Registers

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DSU Cyber Camps

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Using the Terminal

Time of First Successful Submission: 2026-10-14 23:42:59

Using the VSCode Workspace

Time of First Successful Submission: 2026-10-14 23:45:13

Using the GUI Desktop

Time of First Successful Submission: 2026-10-14 23:46:20

Pasting into the Desktop

Time of First Successful Submission: 2026-10-14 23:47:38

Connecting over SSH

Time of First Successful Submission: 2026-10-14 23:50:55

Restarting Challenges

Time of First Successful Submission: 2026-10-14 23:52:31

Getting Help

Time of First Successful Submission: 2026-10-14 23:55:08

Challenge Programs

Time of First Successful Submission: 2026-10-14 23:57:04

The Flag File

Time of First Successful Submission: 2026-10-14 23:58:19

Using Privileged Mode

Time of First Successful Submission: 2026-10-15 00:02:52

Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-10-15 00:05:18


GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-10-14 23:42:59

Using the VSCode Workspace

Time of First Successful Submission: 2026-10-14 23:45:13

Using the GUI Desktop

Time of First Successful Submission: 2026-10-14 23:46:20

Pasting into the Desktop

Time of First Successful Submission: 2026-10-14 23:47:38

Connecting over SSH

Time of First Successful Submission: 2026-10-14 23:50:55

Restarting Challenges

Time of First Successful Submission: 2026-10-14 23:52:31

Getting Help

Time of First Successful Submission: 2026-10-14 23:55:08

Challenge Programs

Time of First Successful Submission: 2026-10-14 23:57:04

The Flag File

Time of First Successful Submission: 2026-10-14 23:58:19

Using Privileged Mode

Time of First Successful Submission: 2026-10-15 00:02:52

Persistent Home Directories - One

Time of First Successful Submission: 2026-10-15 00:04:45

Persistent Home Directories - Two

Time of First Successful Submission: 2026-10-15 00:05:18