Summary of "𝐋𝐢𝐧𝐮𝐱 𝐌𝐚𝐬𝐭𝐞𝐫𝐜𝐥𝐚𝐬𝐬 𝐢𝐧 𝐓𝐚𝐦𝐢𝐥 - 𝟐𝟎𝟐𝟓 𝐄𝐝𝐢𝐭𝐢𝐨𝐧 (𝟒+ 𝐇𝐨𝐮𝐫𝐬 𝐅𝐮𝐥𝐥 𝐂𝐨𝐮𝐫𝐬𝐞) 💻"

Summary of Main Ideas and Concepts

Introduction and Context

• The instructor, Gautham, introduces himself as an experienced data engineer with 11 years in the industry.
• Emphasizes the importance of Linux knowledge for roles like Data Engineer, Software Engineer, Data Analyst, Data Scientist, and ML Engineer.
• Linux is often missing from college syllabi despite being crucial in real-world jobs, especially in data engineering and cloud computing.
• Linux mastery is essential for working with servers, cloud platforms (AWS, Azure, GCP), DevOps, and distributed computing.
• The course aims to cover Linux from beginner to advanced levels, focusing on practical usage in professional environments.

Importance of Linux in Industry

• Linux is the backbone of most servers, cloud infrastructure, and big data frameworks.
• Most applications and services are deployed on Linux servers.
• Remote server management is done via command line (CLI), not GUI.
• Knowing Linux commands and terminal usage is critical since many servers do not provide graphical interfaces.
• Linux skills create a strong impression in interviews and workplace performance.

Open Source Philosophy and Linux Basics

• Linux is a free and open source operating system based on Unix principles.
• Open source software means the source code is freely available for anyone to use, modify, and distribute under licenses like Apache.
• Linux kernel is the core engine of the OS; utilities, tools, and GUI components build on top of it to form a complete OS.
• Linux is customizable, secure, stable, and efficient, running well even on older hardware.
• Linux has multiple distributions (distros) such as Ubuntu, Fedora, CentOS, Arch Linux, Kali Linux, etc.
• Commands and basic usage are mostly consistent across distros with minor differences.

Linux Command Line Interface (CLI)

• The course emphasizes mastering CLI commands since server environments mostly lack GUI.
• Introduction to essential commands:
  • Navigating directories (pwd, cd, ls)
  • File operations (touch, cat, cp, mv, rm)
  • Editing files using editors like vi and vim
  • Managing permissions and file metadata
  • Using wildcards and pattern matching
  • Command history and autocomplete features
• Practical demonstrations on creating, editing, saving, and deleting files.
• Explanation of hidden files (dotfiles) and listing options (ls -a, ls -l).
• How to clear terminal screen (clear command).

File Management and Links

• Explanation of hard links and soft (symbolic) links:
  • Hard link: multiple filenames pointing to the same data on disk.
  • Soft link: a shortcut pointing to another file; if original is deleted, soft link breaks.
• Demonstrated creating, listing, and deleting links.

Aliases and Environment Setup

• How to create aliases to simplify long commands.
• Setting environment variables (JAVA_HOME, PYTHON_HOME) via .bashrc or .profile for persistence.
• Importance of exporting variables and reloading shell configuration.

Process Management and Background Jobs

• Running scripts/programs (e.g., Python) in the foreground and background.
• Using nohup to run processes that persist after terminal closes.
• Checking running processes with top, ps aux.
• Killing processes by PID using kill.
• Viewing logs and monitoring output using commands like tail -f.

Networking and Remote Access

• Introduction to SSH (Secure Shell) for remote server access.
• Using tools like PuTTY on Windows to connect to Linux servers.
• Explanation of SCP (Secure Copy) for file transfer.
• Demonstration of connecting to cloud Linux instances (AWS, Azure).
• Importance of managing SSH keys and passwords securely.

Package Management and Software Installation

• Using sudo apt-get install to install packages like vim, zip, unzip, net-tools, openssh-server.
• Updating package lists with sudo apt-get update.
• Installing and upgrading software from command line.

Compression and Archiving

• Using zip and unzip commands for compressing and extracting files.
• Using tar command with options (-cvf, -xvf) for archiving and extracting tarballs.
• Difference between zip and tar formats.

Disk and Memory Management

• Checking disk space usage with df -h.
• Checking directory size with du -sh.
• Viewing RAM usage with free -m or free -g.
• Explanation of cached memory and how Linux manages memory.

Text Processing and Searching

• Using commands like wc (word count), head, tail to view parts of files.

Category

Educational

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