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THM-Linux-Fundamentals-2

3 min read

THM Linux Fundamentals 2

TryHackMe | Login

Michael Jack | 06/2022

Task 1 - Intro

Welcome to the second part of the reworked “Linux Fundamentals” series. We’ll be applying our knowledge from the first installment in this series, so I highly recommend you completing that room before proceeding further.

In part 2, we’ll be ditching the in-browser functionality and help you get started in what is a fundamental skill in being able to login to and control the terminals of remote machines. Not only this, but the room will also have you:

  • Unlocking the potential of your first few commands by introducing you to using flags and arguments
  • Advancing your knowledge of the filesystem to perform some more useful commands such as copying and moving files
  • Introducing you to the access mechanisms in place to keep files and folders secure and how to identify the things that our current user has access too
  • Running your first few scripts and executables!

Task 2 - Accessing Your Machine Using SSH (Deploy)

Goes over deploying a machine and an attack machine, and using ssh with them.

ssh tryhackme@10.10.231.129

Task 3 - Introduction to Flags and Switches

What directional arrow key to go down a man page?

down

What flag would we use to display the output in a human readable way?

ls -h

Task 4 - Filesystem Interaction Continued

How to create a file “newnote”?

touch newnote

On the deployable machine, what is the file type of “unknown1” in “tryhackme’s” home directory?

ASCII text

How would you move “myfile” to “myfolder”?

mv myfile myfolder

What are the contents of “myfile”?

THM{FILESYSTEM}

Task 5 - Permissions 101

total 16K
-rw-r--r-- 1 user2     user2       14 May  5  2021 important
-rw-r--r-- 1 tryhackme tryhackme   16 May  5  2021 myfile
drwxr-xr-x 2 tryhackme tryhackme 4.0K May  4  2021 myfolder
-rw-r--r-- 1 tryhackme tryhackme   17 May  4  2021 unknown1

Who is the owner of “important”?

user2

Command to switch to “user2”?

su user2

Switching to that user, whats the contents of “important”?

THM{SU_USER2}

Task 6 - Common Directories

What is the directory we’d expect logs to be in?

/var/log

Which directory is similar to how ram works?

/tmp

Home directory of the root user?

/root

Task 7 - Conclusions & Summaries

Nice work! This room was quite theory-heavy and covered quite a range of the fundamentals in getting you familiar with Linux. To quickly recap, this room taught you:

  • How to connect to a Linux machine remotely using SSH
  • Advancing your use of commands by providing flags, switches and where you can go to learn about these for each command (man pages)
  • Some more commands that you’ll frequently be using to interact with the filesystem and its contents
  • A brief introduction to file permissions & switching users
  • A summary paragraph of the important root directories on a Ubuntu Linux install and how we may be able to use the data stored within these.

THM-Linux-Fundamentals-3

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