1. Linux Fundamentals, Shells & VM Setup
Modules 1 & 2: Linux Kernel vs Distros, Bash Shell, CLI vs GUI, root/sudo elevation, VM installation & ISO configuration
Module 1: Linux Fundamentals & Operating System Kernel
Understanding the Linux kernel architecture, distributions, and shell environment.
🇬🇧 English Definition
Linux is an open-source Unix-like kernel. A Linux distribution combines the kernel with user-space utilities, system libraries, package management, and application software.
🇮🇳 Hinglish Definition
Linux ek open-source Unix-like kernel hai. Distribution me kernel ke saath utilities, libraries, package manager aur applications milkar complete operating environment banta hai.
Core Concepts & Rules
- Kernel: Core component managing CPU, RAM, devices, process scheduling, and filesystems.
- Shell & Bash: Bourne Again Shell (Bash) acts as the CLI command interpreter between user and kernel.
- Root & Sudo: Root is the superuser account; sudo grants temporary root elevation for administrative tasks.
🔍 Line-by-Line Command Breakdown
- Line 1: pwd prints current working directory path.
- Line 2: ls -lah lists all files including hidden ones with human-readable sizes.
- Line 3: whoami prints current logged-in user name.
- Line 4: echo $PATH outputs environment PATH executable search directories.
- Line 5: alias ll='ls -lah' creates shortcut alias for detailed listing.
🎯 Interview Focus & Questions
- Q: What is Linux?
A: Linux is an open-source Unix-like kernel; distributions package it with user-space software. - Q: What is a kernel?
A: The core component that manages CPU, memory, devices, processes, filesystems and networking. - Q: What is Bash?
A: Bash means Bourne Again Shell and is a widely used Linux shell interpreter. - Q: What is sudo?
A: sudo allows an authorized user to run commands with elevated root privileges.
pwd
ls -lah
cd /etc
whoami
hostname
man ls
echo $PATH
alias ll='ls -lah'Module 2: Installation, VMs and Initial Setup
Setting up Linux Virtual Machines (VMs), storage allocation, and network interfaces.
🇬🇧 English Definition
Practice Linux first in a Virtual Machine (VM). Understand ISO installation, BIOS/UEFI boot modes, CPU/RAM resource allocation, virtual disks, NAT vs Bridged networking, and updates.
🇮🇳 Hinglish Definition
Linux ko pehle VirtualBox, VMware ya Hyper-V VM me install karke practice karo. Production server par direct experiments avoid karo.
Core Concepts & Rules
- NAT Networking: Provides internet connectivity through host machine IP translation.
- Bridged Networking: Places VM directly onto the same physical network subnet as host.
- System updates: Use system package manager (apt/dnf) to update installed software repositories.
🔍 Line-by-Line Command Breakdown
- Line 1: hostnamectl displays or updates system hostname and OS details.
- Line 2: timedatectl configures system clock time and timezone settings.
- Line 3: ip addr shows all network interface IP addresses.
- Line 4: sudo apt update refreshes package repository index lists.
🎯 Interview Focus & Questions
- Q: Why use a VM for practice?
A: A VM gives an isolated environment for safe Linux administration practice. - Q: NAT vs Bridged networking?
A: NAT provides connectivity through the host; Bridged places the VM on the same network as the host.
hostnamectl
timedatectl
ip addr
ip route
sudo apt update
sudo apt upgrade -y