👈

• Linux Topics
  • Linux Basics
  • File & Directory Management (Linux)
  • File Viewing & Editing (Linux)
  • File Permissions & Ownership (Linux)
  • User & Group Management (Linux)
  • Process Management (Linux)
  • Networking Basics (Linux)
  • Disk & Storage Management (Linux)
  • Package Management (Linux)
  • Service Management (systemd)
  • Environment Variables & Shell
  • Searching & Text Processing (Linux)
  • Compression & Archiving (Linux)
  • SSH & Remote Access
  • Bash Scripting Basics
  • Linux Security Basics
  • Logs & Troubleshooting (Linux)
  • Linux for Cloud (AWS Context)

Linux Topics

Linux Basics

• 1️⃣ What is Linux?
• 2️⃣ Why Linux is important for AWS?
• 3️⃣ Linux Distributions (Very Important)
• 4️⃣ Linux is Case-Sensitive ⚠
• 5️⃣ Linux Directory Structure (High-Level)
• 6️⃣ Root User vs Normal User
• 7️⃣ Linux Shell & Terminal
• 8️⃣ Linux vs Windows (Simple Comparison)
• 9️⃣ What you should remember from Topic 1

File & Directory Management (Linux)

• 1️⃣ What is a File & Directory?
• 2️⃣ Current Working Directory
• 3️⃣ Listing Files & Folders
• 4️⃣ Changing Directories
• 5️⃣ Absolute vs Relative Paths (VERY IMPORTANT)
• 6️⃣ Creating Files & Directories
• 7️⃣ Copying Files & Directories
• 8️⃣ Moving & Renaming
• 9️⃣ Deleting Files & Directories ⚠
• 🔟 Useful Shortcuts
• 1️⃣1️⃣ What you must remember (Exam + Real AWS)

File Viewing & Editing (Linux)

• 1️⃣ Why this topic is important for AWS?
• 2️⃣ Viewing File Content (Basic)
• 3️⃣ Viewing Part of a File
• 4️⃣ Editing Files in Linux
• 5️⃣ nano Editor (Beginner Friendly)
• 6️⃣ vi Editor (Basic Knowledge Enough)
• 8️⃣ What you must remember

File Permissions & Ownership (Linux)

• 1️⃣ Why permissions are important in AWS?
• 2️⃣ Understanding File Permissions
• 3️⃣ Permission Structure (Very Important)
• 4️⃣ User, Group, Others
• 5️⃣ File vs Directory Permissions
• 6️⃣ Changing Permissions chmod (change mode)
• 7️⃣ Making a Script Executable (AWS COMMON)
• 8️⃣ File Ownership chown (change owner)
• 9️⃣ Why sudo is needed
• 🔟 Common AWS Permission Issues
• 1️⃣1️⃣ Real AWS Example
• 1️⃣2️⃣ What you MUST remember

User & Group Management (Linux)

• 1️⃣ Why this topic is important for AWS?
• 2️⃣ What is a User?
• 3️⃣ Root User vs Normal User
• 4️⃣ What is a Group?
• 5️⃣ Important User Commands
• 6️⃣ Creating a User (Admin Task)
• 7️⃣ Switching Users
• 8️⃣ Deleting a User
• 9️⃣ Group Management
• 🔟 AWS Real-Life Examples

Process Management (Linux)

• 1️⃣ What is a Process?
• 2️⃣ Process ID (PID)
• 3️⃣ Foreground vs Background Process
• 4️⃣ Sending Process to Background
• 5️⃣ Process States (High-Level)
• 6️⃣ Monitoring Processes
• 7️⃣ Finding a Specific Process
• 8️⃣ Killing Processes (IMPORTANT)
• 9️⃣ Kill by Name
• 🔟 AWS Real-Life Examples
• 1️⃣1️⃣ Background Jobs
• 1️⃣3️⃣ Background Processes in AWS (nohup)
• 1️⃣2️⃣ What you MUST remember

Networking Basics (Linux)

• 1️⃣ IP Address & Hostname
• 2️⃣ Network Interfaces
• 3️⃣ Ports & Services (VERY IMPORTANT)
• 4️⃣ Connectivity Testing
• 5️⃣ Downloading from Internet
• 6️⃣ AWS Real-Life Debugging Scenario
• 7️⃣ What you MUST remember

Disk & Storage Management (Linux)

• 🧱 What is Disk & Storage Management in Linux?
• 🖴 Types of Storage Devices in Linux
• 🧭 Disk Naming in Linux
• 📦 Partitions (Why needed?)
• 🛠 Partitioning Tools
• 🧬 Filesystem (VERY IMPORTANT)
• 📌 Mounting (Make storage usable)
• 📌 Permanent Mount (fstab)
• 📊 Disk Usage Monitoring
• 📂 Inodes (Often ignored but important)
• 🔐 Permissions & Ownership
• 🔥 Logical Volume Management (LVM)
• ☁️ Disk Management in Cloud (AWS EC2)
• 🧯 Disk Errors & Health
• 🚨 Common Disk Problems
• 🧠 Important Linux Directories
• 🧪 Real-World Example
• 🎯 Interview-Ready Questions
• 🧾 Must-Know Commands (Cheat Sheet)

Package Management (Linux)

• 📦 What is Package Management?
• 🧠 What is a Package?
• 🏗 Why Package Management Exists
• 🗂 Package Management Components
• 🧰 Common Linux Package Managers
• 1️⃣ yum – (Amazon Linux, RHEL, CentOS)
• 2️⃣ dnf – (Amazon Linux 2023)
• 3️⃣ apt – (Ubuntu on EC2)
• 4️⃣ Repository Management (AWS Important)
• 5️⃣ Package Files (rpm & dpkg)
• 6️⃣ Real AWS EC2 Examples 🔥
• 7️⃣ AWS Exam Focus (Remember This)
• 🎯 Interview-Ready Questions
• 🏁 Final Summary

Service Management (systemd)

• 🔧 What is Service Management?
• 🧠 What is systemd?
• 🔹 Main command: systemctl
• 🔄 What is a Service / Daemon?
• 🗂 systemd Unit Types
• 1️⃣ Start a Service
• 2️⃣ Stop a Service
• 3️⃣ Restart a Service (VERY COMMON)
• 4️⃣ Reload a Service
• 5️⃣ Check Service Status ⭐ (MOST IMPORTANT)
• 6️⃣ Enable Service at Boot (AWS CRITICAL)
• 7️⃣ Disable Service at Boot
• 8️⃣ Start + Enable Together
• 9️⃣ List All Services
• 🔟 Check if Service is Enabled
• 1️⃣1️⃣ Check if Service is Active
• 1️⃣2️⃣ View Service Logs (AWS Debugging)
• 1️⃣3️⃣ Common AWS Services & Names
• 1️⃣4️⃣ Real AWS EC2 Examples 🔥
• 1️⃣6️⃣ systemd Files (High Level – Exam Only)
• 1️⃣7️⃣ systemd vs init (Interview / Exam)
• 🧩 Service States
• ⚙️ Anatomy of a Service File
• 🧠 Key Sections Explained
• 🔁 Reload systemd (IMPORTANT)
• ⏱ systemd Timers (cron replacement)
• 🧯 Common systemd Problems
• 🧪 Common Admin Commands
• 🎯 Interview-Ready Q&A
• 🧾 Must-Know Commands Cheat Sheet
• 🏁 Final Summary

Environment Variables & Shell

• 1️⃣ What are Environment Variables?
• 2️⃣ Why Environment Variables are Important in AWS?
• 3️⃣ Viewing Environment Variables
• 4️⃣ PATH Variable (VERY IMPORTANT)
• 5️⃣ Setting Environment Variables (Temporary)
• 6️⃣ Setting Environment Variables (Permanent)
• 7️⃣ Shell Configuration Files
• 8️⃣ Using Environment Variables in Apps
• 9️⃣ AWS Real-Life Example
• 🔟 Common AWS Problems
• 1️⃣1️⃣ What you MUST remember

Searching & Text Processing (Linux)

• 🔍 What is Searching & Text Processing?
• 🧱 Core Philosophy (VERY IMPORTANT)
• 📁 Searching Files (find & locate)
• 📄 Searching Text Inside Files (grep)
• 🔁 Regular Expressions (Regex Basics)
• 🧪 Filtering & Transforming Text
• 📊 Sorting & Counting
• 🔗 Pipes (|) – Power of Linux
• 📂 File Content Viewing
• 🧯 Real-World Use Cases
• 🧠 Common Mistakes
• 🎯 Interview-Ready Questions
• 🧾 Must-Know Commands Cheat Sheet
• 🏁 Final Summary

Compression & Archiving (Linux)

• 1️⃣ What is Archiving vs Compression?
• 2️⃣ tar – Archiving Tool (MOST IMPORTANT)
• 3️⃣ Compressed Archives (tar.gz)
• 4️⃣ gzip & gunzip
• 5️⃣ zip & unzip
• 6️⃣ Backup Basics (AWS Context)
• 7️⃣ AWS Real-Life Example
• 8️⃣ Common Mistakes
• 9️⃣ What you MUST remember

SSH & Remote Access

• 🔐 What is SSH?
• 🌍 Why SSH is Important
• 🧠 How SSH Works (Concept)
• 🖥 SSH Basic Command
• 🔑 SSH Authentication Methods
• 🔐 SSH Key Files
• 🔒 File Permissions (VERY IMPORTANT)
• 🚪 SSH Port & Config
• 📁 File Transfer with SSH
• 🔄 SSH Tunneling & Port Forwarding
• 🧯 Common SSH Errors & Fixes
• ☁️ SSH in AWS EC2 (Real-World)
• 🔐 SSH Security Best Practices
• 🧪 Advanced SSH Options
• 🔁 SSH Config File (Client Side)
• 🎯 Interview-Ready Q&A
• 🧾 Must-Know Commands Cheat Sheet
• 🏁 Final Summary

Bash Scripting Basics

• 🐚 What is Bash?
• 📜 What is a Bash Script?
• 🧱 Structure of a Bash Script
• ▶️ Running a Bash Script
• 🔣 Variables in Bash
• 📥 User Input
• 🔁 Conditional Statements
• 🔄 Loops
• 🧠 Functions
• 📁 File & Directory Checks
• 🔎 Command Line Arguments
• 🔄 Exit Status
• 🔗 Pipes & Redirection
• 🧪 Debugging Bash Scripts
• 🧯 Common Mistakes
• ☁️ Real-World Use Case
• 🎯 Interview-Ready Questions
• 🧾 Must-Know Bash Commands
• 🏁 Final Summary

Linux Security Basics

• 1️⃣ Firewall Basics
• 2️⃣ File Permission Security
• 3️⃣ SSH Security (VERY IMPORTANT)
• 4️⃣ Running Services Securely
• 5️⃣ Principle of Least Privilege
• 6️⃣ AWS Security Context
• 7️⃣ Common AWS Security Mistakes
• 8️⃣ AWS Real-Life Example
• 9️⃣ What you MUST remember

Logs & Troubleshooting (Linux)

• 1️⃣ What are Logs?
• 2️⃣ System Logs
• 3️⃣ Application Logs
• 4️⃣ Reading Error Logs (MOST IMPORTANT)
• 5️⃣ Service Logs (systemd)
• 6️⃣ Basic Troubleshooting Flow (VERY IMPORTANT)
• 7️⃣ AWS Real-Life Example
• 8️⃣ Common AWS Errors & Logs
• 9️⃣ What you MUST remember

Linux for Cloud (AWS Context)

• ☁️ What Does “Linux for Cloud (AWS)” Mean?
• 🧠 Why Linux Is So Important in AWS?
• 🖥 Linux in AWS = EC2
• 🔑 Accessing Linux EC2 (SSH)
• 📁 Linux Filesystem in Cloud Servers
• 📦 Package Management (Cloud Must-Know)
• 🔧 Service Management (Production Critical)
• 📊 Monitoring & Logs (Very Important in Cloud)
• 💾 Storage in AWS (Linux View)
• 🔐 Linux Security in AWS
• 🌐 Networking (Linux + AWS)
• 🧪 Automation with Bash (Cloud Core Skill)
• 🔄 Scaling & Linux
• ☁️ Linux + AWS Services Mapping
• 🧯 Common Cloud Linux Problems
• 🎯 Interview-Ready Q&A
• 🧾 Must-Know Linux Commands for AWS
• 🏁 Final Summary (Very Important)