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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: 2026-02-05 14:34:47

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-05 14:36:35

Using the GUI Desktop

Time of First Successful Submission: 2026-02-05 14:43:38

Pasting into the Desktop

Time of First Successful Submission: 2026-02-05 14:45:03

Restarting Challenges

Time of First Successful Submission: 2026-02-05 14:46:24

Challenge Programs

Time of First Successful Submission: 2026-02-05 14:48:07

The Flag File

Time of First Successful Submission: 2026-02-05 14:50:05

Using Privileged Mode

Time of First Successful Submission: 2026-02-05 14:51:40

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: 2026-02-05 15:00:48

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

Time of First Successful Submission: 2026-02-05 21:13:04

An Epic Filesystem Quest

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making directories

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finding files

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linking files

Time of First Successful Submission: 2026-02-05 21:43:47

Learning From Documentation

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Learning Complex Usage

Time of First Successful Submission: 2026-02-05 22:10:38

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

Time of First Successful Submission: 2026-02-06 06:10:24

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

Time of First Successful Submission: 2026-02-06 06:28:01

Process substitution for input

Time of First Successful Submission: 2026-02-06 07:59:51

Writing to multiple programs

Time of First Successful Submission: 2026-02-06 08:03:57

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

Time of First Successful Submission: 2026-02-06 08:29:39

Reading Input

Time of First Successful Submission: 2026-02-06 08:32:23

Reading Files

Time of First Successful Submission: 2026-02-06 08:37:23

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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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-01-17 14:34:00

... and again!

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Newline Troubles

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Reasoning about files

Time of First Successful Submission: 2026-01-17 22:34:54

Specifying Filenames

Time of First Successful Submission: 2026-01-17 22:36:51

Binary and Hex Encoding

Time of First Successful Submission: 2026-01-17 22:55:59

More Hex

Time of First Successful Submission: 2026-01-17 22:58:10

Decoding Hex

Time of First Successful Submission: 2026-01-17 23:05:42

Decoding Practice

Time of First Successful Submission: 2026-01-18 07:49:54

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

Time of First Successful Submission: 2026-01-18 10:04:35

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

Time of First Successful Submission: 2026-02-03 11:07:39

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)

Time of First Successful Submission: 2026-02-03 12:07:58

HTTP (curl)

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HTTP (python)

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HTTP Host Header (python)

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HTTP Host Header (curl)

Time of First Successful Submission: 2026-02-03 12:54:02

HTTP Host Header (netcat)

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URL Encoding (netcat)

Time of First Successful Submission: 2026-02-03 13:34:56

HTTP GET Parameters

Time of First Successful Submission: 2026-02-03 13:37:27

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-02-03 13:53:09

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-02-03 13:56:56

HTTP Forms

Time of First Successful Submission: 2026-02-03 14:15:16

HTTP Forms (curl)

Time of First Successful Submission: 2026-02-03 14:16:32

HTTP Forms (netcat)

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HTTP Forms (python)

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HTTP Forms Without Forms

Time of First Successful Submission: 2026-02-03 15:20:48

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-02-03 15:23:00

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-02-03 15:36:51

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)

Time of First Successful Submission: 2026-02-03 16:09:18

Server State (python)

Time of First Successful Submission: 2026-02-03 16:16:55

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

Time of First Successful Submission: 2022-10-21 12:36:44

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

Time of First Successful Submission: 2026-02-03 22:45:29

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

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Using the Terminal

Time of First Successful Submission: 2026-02-05 14:34:47

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-05 14:36:35

Using the GUI Desktop

Time of First Successful Submission: 2026-02-05 14:43:38

Pasting into the Desktop

Time of First Successful Submission: 2026-02-05 14:45:03

Connecting over SSH

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Restarting Challenges

Time of First Successful Submission: 2026-02-05 14:46:24

Getting Help

Time of First Successful Submission: 2026-02-05 14:56:21

Challenge Programs

Time of First Successful Submission: 2026-02-05 14:48:07

The Flag File

Time of First Successful Submission: 2026-02-05 14:50:05

Using Privileged Mode

Time of First Successful Submission: 2026-02-05 14:51:40

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-05 14:53:12

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-05 14:53:44