chapter-1-getting-started-with-the-basics.md

Chapter 1: Getting Started with the Basics

Overview

In this chapter, we focus on the essentials of Linux that every beginner needs to understand. You will learn how to:

1. Install Kali Linux on VirtualBox.
2. Use fundamental Linux commands.
3. Navigate the Linux filesystem.
4. Access manual pages and built-in help commands.

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1. Installing Kali Linux

Steps:

1. Download VirtualBox:

   • Visit VirtualBox's official website.
   • Download and install VirtualBox for your operating system.

2. Download Kali Linux:

   • Visit Kali Linux Downloads.
   • Choose the appropriate ISO image for VirtualBox.

3. Create a New Virtual Machine:

   • Open VirtualBox and click New.
   • Provide a name (e.g., "Kali Linux") and select Linux as the type.
   • Allocate at least 2GB of RAM and 20GB of storage.

4. Attach ISO Image:

   • Go to Settings > Storage and attach the downloaded Kali ISO file as a virtual optical disk.

5. Start Installation:

   • Boot the virtual machine and follow the on-screen instructions to complete the installation.

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2. Basic Linux Commands

Common Commands:

Command	Description
pwd	Prints the current working directory
ls	Lists files and directories
cd <path>	Changes the current directory
whoami	Displays the current logged-in user
man <cmd>	Displays the manual for a command
mkdir <name>	Creates a new directory
rm <file>	Deletes a file
touch <file>	Creates an empty file

Examples:

• View current directory:

  pwd

• List all files (including hidden ones):

  ls -a

• Navigate to a directory:

  cd /home

• Create and delete files:

  touch example.txt
  rm example.txt

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3. Navigating the Linux Filesystem

The Linux filesystem is hierarchical, starting at the root directory /.

Common Directories:

• /home: User home directories.
• /etc: Configuration files.
• /var: Logs and variable data.
• /bin: Essential binaries.
• /usr: User-installed applications.

Useful Commands:

• View directory contents:

  ls -l /etc

• Check disk usage:

  df -h

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4. Using Manual Pages and Help

Linux includes comprehensive documentation for commands. Use the following to access it:

Commands:

• Manual pages:

  man <command>

• Help option:

  <command> --help

Example:

• View the manual for ls:

  man ls

• Get a summary of ls options:

  ls --help

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Summary

By the end of this chapter, you should be able to:

• Set up a Linux environment using VirtualBox.
• Execute basic Linux commands for everyday tasks.
• Navigate and understand the Linux filesystem.
• Use manual pages to explore advanced options for commands.

Next Steps:

• Move to Chapter 2: Text Manipulation to learn about processing and analyzing text files in Linux.

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Exercises

1. Create a directory named practice in your home directory.
2. Create an empty file named notes.txt in the practice directory.
3. Navigate to /etc and list all files starting with a.
4. Find the manual for the grep command and identify its -i option.