TryHackMe: Linux Fundamentals Part 2

Overview

• Instructor: John
• Platform: TryHackMe
• Focus: SSH, commands, file system interactions

Task 1: Introduction

• Recommends completing Linux Fundamentals Part 1
• Skills covered:
  • SSH login to Linux machines
  • Using flags and arguments in commands
  • File system interactions: copying, moving files
  • File and folder access mechanisms
  • Running scripts and executables

Task 2: Accessing Your Linux Machine Using SSH

• SSH (Secure Shell): Protocol to securely connect to a remote machine
• Encrypted communication between devices
• Deploying Machines:
  • Start your Linux machine and TryHackMe attack box
  • Machines have a 2-hour lifespan (extendable)
• SSH Command Format:
  • ssh <username>@<ip-address>
  • Example: ssh tryhackme@<ip-address>

Task 3: Introduction to Flags and Switches

• Command Arguments: Modify command behavior
• LS Command: Lists directory contents
  • -a: Show hidden files
• Help Options:
  • --help for command options and usage
  • Man pages (man <command>) for detailed documentation

Task 4: File System Interaction Continued

Creating Files and Folders

• Touch Command: Create files
  • Example: touch <filename>
• Mkdir Command: Create directories
  • Example: mkdir <directoryname>

Removing Files and Folders

• RM Command: Remove files
  • -r: Recursive removal for directories

Copying and Moving Files

• CP Command: Copy files
  • Example: cp <source> <destination>
• MV Command: Move/rename files
  • Example: mv <source> <destination>

Determining File Type

• File Command: Identify file type without extensions
  • Example: file <filename>

Task 5: Permissions 101

• File Permissions Structure:
  • rwx: Read, write, execute for owner, group, others
  • Format: -rw-r--r--
• Switching Users:
  • su <username> to switch users
  • -l switch simulates full login
• Permissions Context: Important for system security

Task 6: Common Directories

• /etc (Etsy): Configuration files, including sudoers
• /var (Variable): Frequently accessed data, log files
• /root: Home directory for root user
• /tmp (Temporary): Volatile data, useful for testing

Task 7: Conclusion and Summary

• Summary of topics covered:
  • SSH usage
  • Commands with flags
  • File system management
  • Understanding permissions
  • Navigating key directories
• Encouragement to review and practice

Task 8: Linux Fundamentals Part 3

• Instructions to terminate the Linux machine
• Suggestion: Continue to Part 3 for further learning

Additional Tips

• Regularly take notes to reinforce learning
• Familiarize yourself with command syntax and man pages