Intermediate Lab: 0

In this module, we'll go over some fundamental terminal commands and concepts you need to know before starting the quiz and lab exercises. By the end of this section, you'll be familiar with navigating the file system, creating and managing files and directories, and using basic network tools.

Terminal Basics

Navigating the File System

ls - List Directory Contents

The ls command is used to list the contents of a directory. It shows files, directories, and sometimes hidden files, depending on the options used.

ls          # List files in the current directory
ls /        # List files in the root directory
ls -a       # List all files, including hidden ones
ls -l       # List files in a detailed format

cd - Change Directory

The cd command allows you to navigate between directories.

cd /home       # Change to the /home directory
cd ..          # Move up one directory level
cd /usr/local  # Move to the /usr/local directory

pwd - Print Working Directory

The pwd command displays the current directory you are in.
```
pwd            # Shows the current directory path
```
mkdir - Create Directory

Use mkdir to create new directories.
```
mkdir testDir  # Creates a directory named testDir
```
touch - Create a New File

The touch command creates an empty file or updates the timestamp of an existing file.
```
touch newfile.txt  # Creates a new file named newfile.txt
```

File Management

cp - Copy Files and Directories

The cp command copies files or directories from one location to another.

cp source.txt destination.txt      # Copy source.txt to destination.txt
cp -r /source/dir /destination/    # Copy a directory recursively

mv - Move or Rename Files and Directories

The mv command moves files or directories or renames them.

mv oldname.txt newname.txt   # Renames oldname.txt to newname.txt
mv /old/path /new/path       # Moves the directory from old to new path

rm - Remove Files and Directories

Use rm to delete files or directories. Be careful as this action is irreversible.

rm file.txt         # Deletes file.txt
rm -r directory/    # Recursively deletes a directory and its contents

File Permissions

chmod - Change File Permissions

The chmod command changes the access permissions of files and directories.

chmod 755 script.sh  # Sets read, write, execute for owner; read, execute for group and others
chmod u+x script.sh  # Adds execute permission for the owner

chown - Change File Ownership

The chown command changes the owner and group of files or directories.
```
chown user:group file.txt  # Changes the owner and group of file.txt
```

Networking Basics

ping - Test Network Connectivity

The ping command checks if a host is reachable over the network.
```
ping google.com     # Pings google.com
```
traceroute - Trace Network Path

The traceroute command shows the path packets take to reach a host.
```
traceroute example.com  # Shows the route to example.com
```
tcpdump - Network Packet Analyzer

tcpdump captures and analyzes network packets. This is useful for inspecting network traffic.
```
tcpdump -i eth0    # Capture packets on interface eth0
```
tshark - Terminal-Based Wireshark

tshark is the terminal version of Wireshark, used for capturing and analyzing network traffic.
```
tshark -i eth0    # Start capturing packets on interface eth0
```

Fingerprinting Basics

JA3, JA4, and JARM Fingerprinting

These are methods used to identify TLS client and server communications.
- JA3: Creates a fingerprint of the SSL/TLS client.
- JA4: Captures additional details in TLS handshakes.
- JARM: A method to identify servers based on TLS configurations.
```
ja3               # Capture and display JA3 fingerprint
ja4               # Capture and display JA4 fingerprint
jarm              # Capture and display JARM fingerprint
```

Getting Started

Now that you have a basic understanding of the terminal commands and network tools, you can proceed to the terminal lab. Make sure to use the help command in the terminal to see all available commands and options.

Note: If you're unsure about a command or its usage, you can always refer back to this guide or use the help command in the terminal.

By mastering these basics, you'll be well-prepared for the terminal lab and quiz. Good luck!

Overview Lab 1 - The Overview