external0day

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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: 2026-04-09 15:19:52

Using the VSCode Workspace

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Using the GUI Desktop

Time of First Successful Submission: 2026-04-09 15:24:47

Pasting into the Desktop

Time of First Successful Submission: 2026-04-09 15:38:07

Restarting Challenges

Time of First Successful Submission: 2026-04-09 15:53:28

Challenge Programs

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The Flag File

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Using Privileged Mode

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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

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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

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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

Time of First Successful Submission: 2026-04-10 17:31:33

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

Time of First Successful Submission: 2026-04-10 18:20:49

Redirecting Script Output

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Executable Shell Scripts

Time of First Successful Submission: 2026-04-10 18:30:05

Understanding Shebangs

Time of First Successful Submission: 2026-04-10 18:32:51

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

Time of First Successful Submission: 2026-04-10 18:39:20

Reading Shell Scripts

Time of First Successful Submission: 2026-04-10 18:40:24

Launching Screen

Time of First Successful Submission: 2026-04-10 19:00:41

Detaching and Attaching

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Finding Sessions

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Switching Windows

Time of First Successful Submission: 2026-04-10 19:05:44

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-10 19:07:01

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-10 19:16:07

The PATH Variable

Time of First Successful Submission: 2026-04-10 23:13:30

Setting PATH

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Finding Commands

Time of First Successful Submission: 2026-04-10 23:15:54

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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Loading From Memory

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More Loading Practice

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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

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Popping From the Stack

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Disassembling Programs

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Tracing Syscalls

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Starting GDB

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Quitting GDB

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Starting Programs in GDB

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Disassembling in GDB

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Stepping Through Instructions

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Reading Register Values

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Popping Stack Values

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Examining Memory

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Examining Stack Pointers

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Cooperative Debugging

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Writing Output

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Chaining Syscalls

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Writing Strings

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Reading Data

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Opening Files

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Hardcoding the Filename

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Comparing Values

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Comparing Characters

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Conditional Control Flow

Time of First Successful Submission: 2026-04-11 18:38:20

Comparing Strings

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Reverse the Password

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Conditionals Without Conditionals

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Looping

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Reverse the Calculation

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Reverse the Reverse

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Dealing with Bitwise Operations

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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

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memory-size-access

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little-endian-write

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memory-sum

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stack-subtraction

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swap-stack-values

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average-stack-values

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absolute-jump

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relative-jump

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jump-trampoline

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conditional-jump

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indirect-jump

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average-loop

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count-non-zero

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string-lower

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most-common-byte

Time of First Successful Submission: 2026-04-25 18:08:07

Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-04-13 15:21:47

... and again!

Time of First Successful Submission: 2026-04-13 22:10:04

Newline Troubles

Time of First Successful Submission: 2026-04-15 10:45:39

Reasoning about files

Time of First Successful Submission: 2026-04-22 05:26:33

Specifying Filenames

Time of First Successful Submission: 2026-04-22 23:05:24

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-04-09 15:19:52

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-09 15:22:28

Using the GUI Desktop

Time of First Successful Submission: 2026-04-09 15:24:47

Pasting into the Desktop

Time of First Successful Submission: 2026-04-09 15:38:07

Connecting over SSH

Time of First Successful Submission: 2026-04-09 15:47:26

Restarting Challenges

Time of First Successful Submission: 2026-04-09 15:53:28

Challenge Programs

Time of First Successful Submission: 2026-04-09 16:01:09

The Flag File

Time of First Successful Submission: 2026-04-09 16:03:32

Using Privileged Mode

Time of First Successful Submission: 2026-04-09 16:07:30

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-09 16:10:11

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-09 16:10:44