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🐧 What is Linux?

Linux is an open-source operating system kernel forming the basis for several Unix-like OSs. Pioneered by Linus Torvalds in 1991, it's now a global OS powerhouse.

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🌟 Why is Linux OS So Famous?

1. Open-Source Brilliance: Linux's source code is open to all, enabling devs to learn, tweak, and share as they wish.

2. Software Diversity: From web servers, DBs, programming languages to multimedia tools, Linux supports a plethora.

3. Community Spirit: A vast and lively Linux community exists for knowledge-sharing, problem-solving, and collaboration.

4. Free Spirit: Typically, Linux is free, slashing licensing costs and boosting resource efficiency.

5. Fort Knox Security: A potent security matrix, coupled with open-source, ensures swift vulnerability resolutions.

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🛠️ Linux Architecture

The Linux architecture seamlessly integrates elements such as:

• Hardware Layer: Housing devices like CPU, HDD, and RAM.

• Kernel: A core OS component, the kernel controls primary Linux functions. It communicates directly with hardware, abstracting trivial hardware/software specifics. Kernel types include:

  • Monolithic Kernel

  • Micro Kernels

  • Exo Kernels

  • Hybrid Kernels

• System Libraries: These OS-implemented functions bypass kernel code access rights.

• System Utility Programs: Designed for specific, individual tasks.

• Shell: Spanning graphical and command-line shells, it acts as the kernel-user liaison. It dispenses kernel services and drives kernel actions.

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📜 Basic Linux Commands

• List Files: ls

• Change Directory: cd

• Create File: touch "filename"

• Copy File: cp Source Destination

• Remove File: rm filename

• Add User: sudo useradd name

• Remove User: userdel -r username

• Current Directory: pwd

• View File Content: cat

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❓ Difference Between Update and Upgrade?

While update merely fetches info about the latest package versions, it's the apt upgrade that actively downloads and elevates the package to its newest avatar.

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