oled0223

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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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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Intro to Cybersecurity

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Path Traversal 1

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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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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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XSS 1

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XSS 2

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XSS 3

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XSS 4

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XSS 5

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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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File Formats: Magic Numbers (C)

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File Formats: Magic Numbers (x86)

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Reading Endianness (C)

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Reading Endianness (x86)

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Version Information (C)

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Version Information (x86)

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Metadata and Data (C)

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Metadata and Data (x86)

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Input Restrictions (C)

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Input Restrictions (x86)

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Behold the cIMG! (C)

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Behold the cIMG! (x86)

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A Basic cIMG (C)

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A Basic cIMG (x86)

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Internal State Mini (C)

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Internal State Mini (x86)

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File Formats: Directives (C)

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File Formats: Directives (x86)

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The Patch Directive

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Your First Overflow (easy)

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Your First Overflow (hard)

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Precision (easy)

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Variable Control (easy)

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Control Hijack (easy)

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PIEs (easy)

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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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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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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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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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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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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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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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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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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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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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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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Tracing Syscalls

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Starting GDB

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Starting Programs in GDB

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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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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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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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Exit

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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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Debugging Programs

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Inspecting Registers

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Examining Memory

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Setting Breakpoints

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GDB Scripting

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Modifying Data

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Modifying Execution

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Broken Functions

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Playing With Programs

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What's the password?

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Newline Troubles

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Reasoning about files

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Binary and Hex Encoding

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More Hex

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Decoding Hex

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Hex-encoding ASCII

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Hex-encoding UTF-8

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Decoding Base64

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Encoding Base64

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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 (curl)

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HTTP (python)

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HTTP Host Header (python)

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URL Encoding (netcat)

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HTTP GET Parameters

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Multiple HTTP Parameters (curl)

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HTTP Forms (curl)

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HTTP Redirects (curl)

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HTTP Cookies (python)

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Server State (python)

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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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SQL Queries

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Filtering SQL

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Choosing Columns

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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: 2026-01-15 17:06:02

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-18 22:32:23

Using the GUI Desktop

Time of First Successful Submission: 2026-01-18 22:34:02

Pasting into the Desktop

Time of First Successful Submission: 2026-01-18 22:36:11

Connecting over SSH

Time of First Successful Submission: 2026-01-18 22:41:32

Restarting Challenges

Time of First Successful Submission: 2026-01-18 22:45:10

Getting Help

Time of First Successful Submission: 2026-01-18 22:47:37