flexile

🐧

Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-08-30 14:03:02

Command Arguments

Time of First Successful Submission: 2026-08-30 14:04:34

Command History

Time of First Successful Submission: 2026-08-30 14:05:32

The Root Path

Time of First Successful Submission: 2026-08-30 14:07:19

Absolute Paths

Time of First Successful Submission: 2026-08-30 14:09:23

Changing position

Time of First Successful Submission: 2026-08-30 14:11:54

Changing to an Absolute Path

Time of First Successful Submission: 2026-08-30 14:14:53

Relative Paths

Time of First Successful Submission: 2026-08-30 14:21:29

Cat

Time of First Successful Submission: 2026-08-31 07:15:32

Ls

Time of First Successful Submission: 2026-08-31 07:35:02

Ls All

Time of First Successful Submission: 2026-08-31 07:48:32

Find

Time of First Successful Submission: 2026-08-31 08:18:29

Piping Echo

Time of First Successful Submission: 2026-09-07 17:01:46

Piping Stdout

Time of First Successful Submission: 2026-09-07 17:14:47

Piping Stdin

Time of First Successful Submission: 2026-09-07 17:28:22


Intro to Cybersecurity

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Path Traversal 1

Time of First Successful Submission: 2026-09-19 13:48:24

Path Traversal 2

Time of First Successful Submission: 2026-09-19 16:09:41

File Formats: Magic Numbers (Python)

Time of First Successful Submission: 2026-09-03 18:26:55

File Formats: Magic Numbers (C)

Time of First Successful Submission: 2026-09-03 18:44:29

File Formats: Magic Numbers (x86)

Time of First Successful Submission: 2026-09-03 19:01:09

Reading Endianness (Python)

Time of First Successful Submission: 2026-09-05 17:04:25


Program Security

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Terrible Token (Easy)

Time of First Successful Submission: 2026-08-31 19:09:48

Terrible Token (Hard)

Time of First Successful Submission: 2026-09-01 19:27:51

Tangled Ticket (Easy)

Time of First Successful Submission: 2026-09-01 19:36:20

Tangled Ticket (Hard)

Time of First Successful Submission: 2026-09-01 20:23:20

Bit Bender

Time of First Successful Submission: 2026-09-02 17:27:35


Start Here

10 / 10 16722 / 65479


Using the Terminal

Time of First Successful Submission: 2026-08-30 10:52:05

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-30 10:56:09

Using the GUI Desktop

Time of First Successful Submission: 2026-08-30 11:00:36

Pasting into the Desktop

Time of First Successful Submission: 2026-08-30 11:03:06

Restarting Challenges

Time of First Successful Submission: 2026-08-30 11:54:26

Challenge Programs

Time of First Successful Submission: 2026-08-30 12:05:52

The Flag File

Time of First Successful Submission: 2026-08-30 12:24:06

Using Privileged Mode

Time of First Successful Submission: 2026-08-30 12:29:33

Persistent Home Directories - One

Time of First Successful Submission: 2026-08-30 12:41:24

Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-30 12:50:12


Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-08-30 14:03:02

Intro to Arguments

Time of First Successful Submission: 2026-08-30 14:04:34

Command History

Time of First Successful Submission: 2026-08-30 14:05:32

The Root

Time of First Successful Submission: 2026-08-30 14:07:19

Program and absolute paths

Time of First Successful Submission: 2026-08-30 14:09:23

Position thy self

Time of First Successful Submission: 2026-08-30 14:11:54

Position elsewhere

Time of First Successful Submission: 2026-08-30 14:14:53

implicit relative paths, from /

Time of First Successful Submission: 2026-08-30 14:21:29

explicit relative paths, from /

Time of First Successful Submission: 2026-08-30 14:24:45

implicit relative path

Time of First Successful Submission: 2026-08-30 14:45:12

home sweet home

Time of First Successful Submission: 2026-08-30 14:53:34

cat: not the pet, but the command!

Time of First Successful Submission: 2026-08-31 07:15:32

catting absolute paths

Time of First Successful Submission: 2026-08-31 07:16:36

more catting practice

Time of First Successful Submission: 2026-08-31 07:17:59

grepping for a needle in a haystack

Time of First Successful Submission: 2026-08-31 07:19:28

comparing files

Time of First Successful Submission: 2026-08-31 07:21:19

listing files

Time of First Successful Submission: 2026-08-31 07:35:02

touching files

Time of First Successful Submission: 2026-08-31 07:42:00

removing files

Time of First Successful Submission: 2026-08-31 07:44:34

moving files

Time of First Successful Submission: 2026-08-31 07:45:50

copying files

Time of First Successful Submission: 2026-08-31 07:46:59

hidden files

Time of First Successful Submission: 2026-08-31 07:48:32

An Epic Filesystem Quest

Time of First Successful Submission: 2026-08-31 07:57:32

making directories

Time of First Successful Submission: 2026-08-31 08:02:54

finding files

Time of First Successful Submission: 2026-08-31 08:18:29

linking files

Time of First Successful Submission: 2026-08-31 08:27:25

Learning From Documentation

Time of First Successful Submission: 2026-08-31 08:43:26

Learning Complex Usage

Time of First Successful Submission: 2026-08-31 08:47:28

Reading Manuals

Time of First Successful Submission: 2026-08-31 09:14:01

Searching Manuals

Time of First Successful Submission: 2026-08-31 09:16:44

Searching For Manuals

Time of First Successful Submission: 2026-08-31 09:26:19

Helpful Programs

Time of First Successful Submission: 2026-08-31 09:29:48

Help for Builtins

Time of First Successful Submission: 2026-08-31 09:53:26

Matching with *

Time of First Successful Submission: 2026-09-06 19:21:46

Matching with ?

Time of First Successful Submission: 2026-09-06 19:23:27

Matching with []

Time of First Successful Submission: 2026-09-06 19:29:49

Matching paths with []

Time of First Successful Submission: 2026-09-06 19:32:37

Multiple globs

Time of First Successful Submission: 2026-09-06 19:37:21

Mixing globs

Time of First Successful Submission: 2026-09-06 19:55:28

Exclusionary globbing

Time of First Successful Submission: 2026-09-06 19:59:43

Tab completion

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

Multiple options for tab completion

Time of First Successful Submission: 2026-09-07 05:06:31

Tab completion on commands

Time of First Successful Submission: 2026-09-07 05:12:44

Redirecting output

Time of First Successful Submission: 2026-09-07 17:01:46

Redirecting more output

Time of First Successful Submission: 2026-09-07 17:14:47

Appending output

Time of First Successful Submission: 2026-09-07 17:15:56

Redirecting errors

Time of First Successful Submission: 2026-09-07 17:25:31

Redirecting input

Time of First Successful Submission: 2026-09-07 17:28:22

Grepping stored results

Time of First Successful Submission: 2026-09-07 17:32:28

Grepping live output

Time of First Successful Submission: 2026-09-07 18:45:40

Grepping errors

Time of First Successful Submission: 2026-09-07 18:51:11

Filtering with grep -v

Time of First Successful Submission: 2026-09-08 17:28:55

Filtering with sed

Time of First Successful Submission: 2026-09-08 17:35:48

Duplicating piped data with tee

Time of First Successful Submission: 2026-09-08 18:12:24

Process substitution for input

Time of First Successful Submission: 2026-09-08 19:23:14

Writing to multiple programs

Time of First Successful Submission: 2026-09-08 19:43:16

Split-piping stderr and stdout

Time of First Successful Submission: 2026-09-08 20:00:58

Named pipes

Time of First Successful Submission: 2026-09-08 20:24:33

Printing Variables

Time of First Successful Submission: 2026-09-09 05:24:41

Setting Variables

Time of First Successful Submission: 2026-09-09 05:30:10

Multi-word Variables

Time of First Successful Submission: 2026-09-09 05:32:15

Exporting Variables

Time of First Successful Submission: 2026-09-09 06:47:34

Printing Exported Variables

Time of First Successful Submission: 2026-09-09 06:50:55

Storing Command Output

Time of First Successful Submission: 2026-09-09 16:11:39

Reading Input

Time of First Successful Submission: 2026-09-09 16:14:08

Reading Files

Time of First Successful Submission: 2026-09-09 16:20:37

Translating characters

Time of First Successful Submission: 2026-09-10 05:17:28

Deleting characters

Time of First Successful Submission: 2026-09-10 05:27:21

Deleting newlines

Time of First Successful Submission: 2026-09-10 05:34:43

Extracting the first lines with head

Time of First Successful Submission: 2026-09-10 05:41:10

Extracting specific sections of text

Time of First Successful Submission: 2026-09-10 06:02:19

Sorting data

Time of First Successful Submission: 2026-09-10 06:11:05

Listing Processes

Time of First Successful Submission: 2026-09-12 15:49:23

Killing Processes

Time of First Successful Submission: 2026-09-12 15:52:59

Interrupting Processes

Time of First Successful Submission: 2026-09-12 15:55:03

Killing Misbehaving Processes

Time of First Successful Submission: 2026-09-12 16:14:22

Suspending Processes

Time of First Successful Submission: 2026-09-12 16:16:32

Resuming Processes

Time of First Successful Submission: 2026-09-12 16:21:07

Backgrounding Processes

Time of First Successful Submission: 2026-09-12 16:26:59

Foregrounding Processes

Time of First Successful Submission: 2026-09-12 16:28:23

Starting Backgrounded Processes

Time of First Successful Submission: 2026-09-12 16:30:11

Process Exit Codes

Time of First Successful Submission: 2026-09-12 16:40:54

Becoming root with su

Time of First Successful Submission: 2026-09-09 16:30:10

Other users with su

Time of First Successful Submission: 2026-09-09 16:31:45

Cracking passwords

Time of First Successful Submission: 2026-09-09 16:35:47

Using sudo

Time of First Successful Submission: 2026-09-09 17:02:32

Changing File Ownership

Time of First Successful Submission: 2026-09-13 11:17:02

Groups and Files

Time of First Successful Submission: 2026-09-13 11:18:50

Fun With Groups Names

Time of First Successful Submission: 2026-09-13 11:23:56

Changing Permissions

Time of First Successful Submission: 2026-09-13 11:26:16

Executable Files

Time of First Successful Submission: 2026-09-13 12:11:46

Permission Tweaking Practice

Time of First Successful Submission: 2026-09-13 12:28:36

Permissions Setting Practice

Time of First Successful Submission: 2026-09-13 12:35:03

The SUID Bit

Time of First Successful Submission: 2026-09-13 12:43:01

Chaining with Semicolons

Time of First Successful Submission: 2026-09-13 13:01:20

Building on Success

Time of First Successful Submission: 2026-09-13 13:04:01

Handling Failure

Time of First Successful Submission: 2026-09-13 13:09:41

Your First Shell Script

Time of First Successful Submission: 2026-09-13 13:36:11

Redirecting Script Output

Time of First Successful Submission: 2026-09-13 13:46:14

Executable Shell Scripts

Time of First Successful Submission: 2026-09-13 13:54:18

Understanding Shebangs

Time of First Successful Submission: 2026-09-13 14:05:08

Scripting with Arguments

Time of First Successful Submission: 2026-09-13 14:13:39

Scripting with Conditionals

Time of First Successful Submission: 2026-09-13 14:18:38

Scripting with Default Cases

Time of First Successful Submission: 2026-09-13 14:21:23

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-09-13 14:25:57

Reading Shell Scripts

Time of First Successful Submission: 2026-09-13 14:31:19

Launching Screen

Time of First Successful Submission: 2026-09-13 18:49:00

Detaching and Attaching

Time of First Successful Submission: 2026-09-13 18:51:42

Finding Sessions

Time of First Successful Submission: 2026-09-13 18:54:34

Switching Windows

Time of First Successful Submission: 2026-09-13 19:01:25

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-09-13 19:04:09

Switching Windows (tmux)

Time of First Successful Submission: 2026-09-13 19:14:06

The PATH Variable

Time of First Successful Submission: 2026-09-13 19:17:25

Setting PATH

Time of First Successful Submission: 2026-09-13 19:33:32

Finding Commands

Time of First Successful Submission: 2026-09-13 19:38:50

Adding Commands

Time of First Successful Submission: 2026-09-13 19:52:44

Hijacking Commands

Time of First Successful Submission: 2026-09-13 20:00:03

Bashrc Backdoor

Time of First Successful Submission: 2026-09-14 16:01:49

Sniffing Input

Time of First Successful Submission: 2026-09-14 16:21:47

Overshared Directories

Time of First Successful Submission: 2026-09-14 19:23:22

Tricky Linking

Time of First Successful Submission: 2026-09-14 19:51:09

Sniffing Process Arguments

Time of First Successful Submission: 2026-09-14 19:53:51

Snooping on Configurations

Time of First Successful Submission: 2026-09-14 20:03:31

The Fork Bomb

Time of First Successful Submission: 2026-09-16 05:20:02

Disk-Space Doomsday

Time of First Successful Submission: 2026-09-15 18:40:30

rm -rf /

Time of First Successful Submission: 2026-09-14 19:12:06

Life after rm -rf /

Time of First Successful Submission: 2026-09-15 18:52:47

Finding meaning after rm -rf /

Time of First Successful Submission: 2026-09-15 18:56:49


Computing 101

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Your First Register

Time of First Successful Submission: 2026-09-07 16:16:01

Your First Syscall

Time of First Successful Submission: 2026-09-07 16:19:21

Exit Codes

Time of First Successful Submission: 2026-09-07 16:25:49

Building Executables

Time of First Successful Submission: 2026-09-07 16:33:58

Moving Between Registers

Time of First Successful Submission: 2026-09-07 16:52:58

Loading From Memory

Time of First Successful Submission: 2026-09-19 09:50:56

More Loading Practice

Time of First Successful Submission: 2026-09-19 12:30:58


Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-08-30 13:16:35

... and again!

Time of First Successful Submission: 2026-09-16 17:29:44

Newline Troubles

Time of First Successful Submission: 2026-09-16 18:04:46


DSU Cyber Camps

15 / 104 460 / 65889


Using the Terminal

Time of First Successful Submission: 2026-08-30 10:52:05

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-30 10:56:09

Using the GUI Desktop

Time of First Successful Submission: 2026-08-30 11:00:36

Pasting into the Desktop

Time of First Successful Submission: 2026-08-30 11:03:06

Restarting Challenges

Time of First Successful Submission: 2026-08-30 11:54:26

Getting Help

Time of First Successful Submission: 2026-08-30 12:00:55

Challenge Programs

Time of First Successful Submission: 2026-08-30 12:05:52

The Flag File

Time of First Successful Submission: 2026-08-30 12:24:06

Using Privileged Mode

Time of First Successful Submission: 2026-08-30 12:29:33

Persistent Home Directories - One

Time of First Successful Submission: 2026-08-30 12:41:24

Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-30 12:50:12

Running Commands

Time of First Successful Submission: 2026-08-30 13:27:20

Move through the Linux filesystem.

Time of First Successful Submission: 2026-08-30 13:34:17

Create and delete files.

Time of First Successful Submission: 2026-08-30 13:40:11

Move, copy, and rename files.

Time of First Successful Submission: 2026-08-30 13:49:29


GCA CTF

15 / 104 460 / 65889


Using the Terminal

Time of First Successful Submission: 2026-08-30 10:52:05

Using the VSCode Workspace

Time of First Successful Submission: 2026-08-30 10:56:09

Using the GUI Desktop

Time of First Successful Submission: 2026-08-30 11:00:36

Pasting into the Desktop

Time of First Successful Submission: 2026-08-30 11:03:06

Restarting Challenges

Time of First Successful Submission: 2026-08-30 11:54:26

Getting Help

Time of First Successful Submission: 2026-08-30 12:00:55

Challenge Programs

Time of First Successful Submission: 2026-08-30 12:05:52

The Flag File

Time of First Successful Submission: 2026-08-30 12:24:06

Using Privileged Mode

Time of First Successful Submission: 2026-08-30 12:29:33

Persistent Home Directories - One

Time of First Successful Submission: 2026-08-30 12:41:24

Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-30 12:50:12

Running Commands

Time of First Successful Submission: 2026-08-30 13:27:20

Move through the Linux filesystem.

Time of First Successful Submission: 2026-08-30 13:34:17

Create and delete files.

Time of First Successful Submission: 2026-08-30 13:40:11

Move, copy, and rename files.

Time of First Successful Submission: 2026-08-30 13:49:29