a7medi

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-03-14 00:43:46

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: 2026-03-14 00:47:30

Changing to an Absolute Path

Time of First Successful Submission: 2026-03-14 00:49:04

Relative Paths

Time of First Successful Submission: 2026-03-14 00:50:39

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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Intro to Cybersecurity

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Path Traversal 1

Time of First Successful Submission: 2026-03-21 13:37:20

Path Traversal 2

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CMDi 1

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CMDi 2

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CMDi 3

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CMDi 4

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CMDi 5

Time of First Successful Submission: 2026-03-21 16:06:48

CMDi 6

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Authentication Bypass 1

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Authentication Bypass 2

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SQLi 1

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SQLi 2

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SQLi 3

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SQLi 4

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SQLi 5

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XSS 1

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XSS 2

Time of First Successful Submission: 2026-03-22 14:53:05

XSS 3

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XSS 4

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XSS 5

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XSS 6

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XSS 7

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CSRF 1

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CSRF 2

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CSRF 3

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CSRF 4

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CSRF 5

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Connect

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Send

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Shutdown

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Listen

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Scan 1

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Scan 2

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Monitor 1

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Monitor 2

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Sniffing Cookies

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Network Configuration

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Firewall 1

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Firewall 2

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Firewall 3

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Denial of Service 1

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Denial of Service 2

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Ethernet

Time of First Successful Submission: 2026-03-28 18:29:07

IP

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TCP

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TCP Handshake

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Start Here

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Using the Terminal

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Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Restarting Challenges

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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

Time of First Successful Submission: 2026-03-14 00:43:46

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

Time of First Successful Submission: 2026-03-15 18:16:03

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

Time of First Successful Submission: 2026-03-16 17:16:05

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

Time of First Successful Submission: 2026-03-15 21:27:32

Storing Command Output

Time of First Successful Submission: 2026-03-15 21:28:58

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

Time of First Successful Submission: 2026-03-15 21:42:30

Extracting specific sections of text

Time of First Successful Submission: 2026-03-15 21:43:54

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: 2026-03-15 22:19:04

Using sudo

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Changing File Ownership

Time of First Successful Submission: 2026-03-15 22:25:05

Groups and Files

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Fun With Groups Names

Time of First Successful Submission: 2026-03-15 22:27:30

Changing Permissions

Time of First Successful Submission: 2026-03-15 22:28:15

Executable Files

Time of First Successful Submission: 2026-03-15 22:28:57

Permission Tweaking Practice

Time of First Successful Submission: 2026-03-15 22:33:18

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

Time of First Successful Submission: 2026-03-15 23:07:13

Your First Shell Script

Time of First Successful Submission: 2026-03-15 23:08:16

Redirecting Script Output

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Executable Shell Scripts

Time of First Successful Submission: 2026-03-15 23:10:06

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

Time of First Successful Submission: 2026-03-15 23:19:35

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

Time of First Successful Submission: 2026-03-15 23:28:00

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

Time of First Successful Submission: 2026-03-15 23:48:57

Sniffing Input

Time of First Successful Submission: 2026-03-16 00:00:46

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 /

Time of First Successful Submission: 2026-03-16 00:58:22

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

Time of First Successful Submission: 2026-03-16 16:32:08

Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-03-16 16:47:36

More Loading Practice

Time of First Successful Submission: 2026-03-16 16:49:59

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

Time of First Successful Submission: 2026-03-16 17:26:00

Disassembling in GDB

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Stepping Through Instructions

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Reading Register Values

Time of First Successful Submission: 2026-03-16 17:29:54

Popping Stack Values

Time of First Successful Submission: 2026-03-16 17:30:47

Examining Memory

Time of First Successful Submission: 2026-03-16 17:32:02

Examining Stack Pointers

Time of First Successful Submission: 2026-03-16 17:34:55

Cooperative Debugging

Time of First Successful Submission: 2026-03-16 17:40:35

Writing Output

Time of First Successful Submission: 2026-03-16 17:55:08

Chaining Syscalls

Time of First Successful Submission: 2026-03-16 18:21:43

Writing Strings

Time of First Successful Submission: 2026-03-16 18:23:05

Reading Data

Time of First Successful Submission: 2026-03-16 18:27:17

Opening Files

Time of First Successful Submission: 2026-03-16 18:32:49

Hardcoding the Filename

Time of First Successful Submission: 2026-03-16 18:41:14

Comparing Values

Time of First Successful Submission: 2026-03-16 19:15:30

Comparing Characters

Time of First Successful Submission: 2026-03-16 19:20:13

Conditional Control Flow

Time of First Successful Submission: 2026-03-16 19:25:27

Comparing Strings

Time of First Successful Submission: 2026-03-16 19:26:37

Reverse the Password

Time of First Successful Submission: 2026-03-16 19:34:05

Conditionals Without Conditionals

Time of First Successful Submission: 2026-03-16 20:16:16

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

Time of First Successful Submission: 2026-03-17 14:53:35

jump-trampoline

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conditional-jump

Time of First Successful Submission: 2026-03-17 16:28:45

indirect-jump

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average-loop

Time of First Successful Submission: 2026-03-17 16:48:53

count-non-zero

Time of First Successful Submission: 2026-03-17 17:04:09

string-lower

Time of First Successful Submission: 2026-03-17 21:29:53

most-common-byte

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Exit

Time of First Successful Submission: 2026-03-17 22:10:53

Socket

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Bind

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Listen

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Accept

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Static Response

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Dynamic Response

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Iterative GET Server

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Concurrent GET Server

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Concurrent POST Server

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Web Server

Time of First Successful Submission: 2026-03-18 19:28:59

Debugging Programs

Time of First Successful Submission: 2026-03-19 17:13:43

Inspecting Registers

Time of First Successful Submission: 2026-03-19 17:15:56

Examining Memory

Time of First Successful Submission: 2026-03-19 17:40:12

Setting Breakpoints

Time of First Successful Submission: 2026-03-19 17:54:27

GDB Scripting

Time of First Successful Submission: 2026-03-19 18:14:52

Modifying Data

Time of First Successful Submission: 2026-03-19 18:37:21

Modifying Execution

Time of First Successful Submission: 2026-03-19 18:52:18

Broken Functions

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-03-19 20:18:27

... and again!

Time of First Successful Submission: 2026-03-19 20:19:41

Newline Troubles

Time of First Successful Submission: 2026-03-19 20:28:59

Reasoning about files

Time of First Successful Submission: 2026-03-19 20:23:00

Specifying Filenames

Time of First Successful Submission: 2026-03-19 20:23:58

Binary and Hex Encoding

Time of First Successful Submission: 2026-03-19 20:27:52

More Hex

Time of First Successful Submission: 2026-03-19 20:30:23

Decoding Hex

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Decoding Practice

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Encoding Practice

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Hex-encoding ASCII

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Nested Encoding

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Hex-encoding UTF-8

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UTF Mixups

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Modifying Encoded Data

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Decoding Base64

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Encoding Base64

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Dealing with Obfuscation

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Dealing with Obfuscation 2

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Your First HTTP Request

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Reading Flask

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Commented Data

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HTTP Metadata

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HTTP (netcat)

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HTTP Paths (netcat)

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HTTP (curl)

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HTTP (python)

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HTTP Host Header (python)

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HTTP Host Header (curl)

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HTTP Host Header (netcat)

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URL Encoding (netcat)

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HTTP GET Parameters

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Multiple HTTP Parameters (netcat)

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Multiple HTTP Parameters (curl)

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HTTP Forms

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HTTP Forms (curl)

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HTTP Forms (netcat)

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HTTP Forms (python)

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HTTP Forms Without Forms

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Multiple Form Fields (curl)

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Multiple Form Fields (netcat)

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HTTP Redirects (netcat)

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HTTP Redirects (curl)

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HTTP Redirects (python)

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HTTP Cookies (curl)

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HTTP Cookies (netcat)

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HTTP Cookies (python)

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Server State (python)

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Listening Web

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Speaking Redirects

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JavaScript Redirects

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Including JavaScript

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HTTP (javascript)

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HTTP Get Parameters (javascript)

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HTTP Forms (javascript)

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cat

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more

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less

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tail

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head

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sort

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vim

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emacs

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nano

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rev

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od

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hd

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xxd

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base32

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base64

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split

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gzip

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bzip2

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zip

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tar

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ar

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cpio

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genisoimage

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env

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find

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make

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nice

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timeout

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stdbuf

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setarch

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watch

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socat

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whiptail

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awk

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sed

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ed

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chown

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chmod

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cp

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mv

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perl

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python

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ruby

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bash

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date

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dmesg

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wc

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gcc

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as

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wget

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ssh-keygen

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SQL Queries

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Filtering SQL

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Choosing Columns

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Exclusionary Filtering

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Filtering Strings

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Filtering on Expressions

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SELECTing Expressions

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Composite Conditions

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Reaching Your LIMITs

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Querying Metadata

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GCA CTF

12 / 104 1938 / 44133

Using the Terminal

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Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Connecting over SSH

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Restarting Challenges

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Getting Help

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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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