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

Summary of Main Ideas and Concepts

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.

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.

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.

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).

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.

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.

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.

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.