Overview Here are three approaches to record SSH sessions made to your machine using asciinema, from simple to robust: Approach 1: Basic .bashrc Method Add asciinema recording to users' .bashrc files: # Check if not already recording if [[ -z $ASCIINEMA_REC ]]; then SESSION_ID="$(whoami)-$(date +%Y%m%
1. Built-in Linux Tools script Command * What it captures: All terminal text output and commands entered * Storage format: Plain text file with terminal control characters * Playback: Can be viewed with cat or any text editor, but includes control characters * Storage requirements: Large files due to verbose output (includes all control
Table of Contents * What is Ansible? * Key Concepts * Installation * Getting Started * Inventory Management * Playbooks * Modules * Variables and Facts * Handlers * Roles * Best Practices * Common Use Cases * Troubleshooting What is Ansible? Ansible is an open-source automation platform that simplifies cloud provisioning, configuration management, application deployment, intra-service orchestration, and many other IT needs.
There are several ways to find empty fields in a JSON file, depending on your preferences and the tools available. Here are the most common approaches: Using jq (Command Line) jq is a powerful JSON processor that's perfect for this task: # Find empty strings jq -r 'paths
LaTeX is the standard for typesetting mathematical formulas. You can use it in many environments, including Markdown, Jupyter Notebooks, Overleaf, and more. 1. Math Modes Display Math: Use double dollar signs or \[ ... \]: $$E = mc^2$$ or \[ E = mc^2 \] Renders as: \[ E = mc^2 \] Inline Math: Use single dollar signs:
Overview This document provides practical examples of good and bad database design patterns, illustrated with MermaidJS diagrams. Each example shows the problem, explains why it's problematic, and demonstrates the correct approach. 1. Table Structure Design ❌ Bad Example: Denormalized Customer Table erDiagram CUSTOMERS_BAD { int customer_id PK string
Overview Database design is the process of creating a detailed data model of a database that defines the logical structure, relationships, constraints, and organization of data. Good database design ensures data integrity, reduces redundancy, optimizes performance, and supports business requirements. Database Design Process 1. Requirements Analysis Gather Business Requirements * Identify
Table of Contents 1. Introduction 2. Basic Syntax 3. Metacharacters 4. Character Classes 5. Quantifiers 6. Anchors 7. Groups and Capturing 8. Lookaheads and Lookbehinds 9. Flags/Modifiers 10. Common Patterns 11. Examples 12. Best Practices 13. Tools and Testing Introduction Regular expressions (regex or regexp) are powerful pattern-matching tools
Array Structures Static Array graph LR A[Index 0 Value: 10] --> B[Index 1 Value: 20] B --> C[Index 2 Value: 30] C --> D[Index 3 Value: 40] D --> E[Index 4 Value: 50] style A fill:#e1f5fe style B fill:#e1f5fe
Table of Contents 1. Introduction 2. Time and Space Complexity 3. Basic Data Structures 4. Advanced Data Structures 5. Fundamental Algorithms 6. Algorithm Design Paradigms 7. Problem-Solving Strategies 8. Common Algorithm Patterns Introduction Data structures and algorithms form the foundation of computer science and software engineering. Understanding these concepts is
Special Variables $_ - Last argument of previous command mkdir my_directory && cd "$_" cp file.txt /backup && ls "$_" # ls /backup !! - Repeat last command sudo !! # Run last command with sudo echo "test" && !! # Repeat the echo !$ - Last argument of
Table of Contents 1. Introduction 2. Core Principles 3. Key Concepts 4. Advanced Topics 5. Benefits and Drawbacks 6. Examples Introduction Object-Oriented Programming (OOP) is a programming paradigm that organizes code around objects rather than functions and logic. It's based on the concept of "objects" which