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Bash

Bash (Bourne Again SHell) ek command-line shell aur scripting language hai jo Linux, macOS, aur…

Overview
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Bash — Quick Facts

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Property: Detail

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Full Name: Bash (Bourne Again SHell)

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Category: Command-Line Shell, Scripting…

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Type: Unix shell / Command interpreter

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Infobox

📚 | Property | Detail | |---|---| | Full Name | Bash (Bourne Again SHell) | | Category |…
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What is Bash

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Operating system ke 3 layers:…

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Kernel directly hardware manage…

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Shell kernel se baat karta hai…

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Shell = translator between human…

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History

🎯 Timeline | Year | Event | |---|---| | 1971 | Thompson Shell — Ken Thompson (first Unix…
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How Bash Works

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PATH: Directories ki list jaha…

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Environment variables: Key-value…

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Exit codes: Har command ek exit…

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Processes: Har external command ek…

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Key Features

🔑 | Feature | Description | Concept Example | |---|---|---| | Command History | Previous…
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Common Commands Overview

✨ | Category | Command | Purpose | |---|---|---| | Navigation | cd | Change directory | |…
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Bash Scripting Concepts

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Manual kaam jisme 30 minutes lagte…

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Daily backup → cron job + bash…

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100 servers pe same config change…

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CI/CD pipeline → bash script steps…

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Piping and Redirection

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Ek command ka stdout doosre…

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Chain banao: command1 | command2 |…

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Example concept: "Access log me se…

Topic 9
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Bash vs Other Shells

📚 | Shell | Year | Creator | Key Feature | License | Status | |---|---|---|---|---|---| |…
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Bash in DevOps and Automation

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Ubiquity: Har Linux server pe…

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Lightweight: Python/Ruby install…

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Glue language: Different tools ko…

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Pipeline native: CI/CD systems…

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Configuration Files

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Login shell: Jab tum system me…

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Non-login (interactive): Jab…

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Common practice: .bash_profile me…

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Anti-Patterns

⭐ 1. Parsing ls Output ls ka output programme me parse karna (filenames me spaces, special…
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Real-World Examples

🔑 Server Deployment Script New code deploy karna production server pe. Script: (1) Git pull…
Topic 14
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Common Mistakes

✨ 1. Variables quote nahi karna — $var instead of "$var". Word splitting aur glob expansion…
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Best Practices

🌟 1. Strict Mode Use Karo — Script ke top pe set -euo pipefail: -e (exit on error), -u…
Topic 16
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Interview Perspective

🚀 Common Questions aur Answers Q1: Bash kya hai? A: Bash (Bourne Again SHell) ek…
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Glossary

📚 | Term | Definition | |---|---| | Bash | Bourne Again SHell — GNU Project ka free,…
Comparison
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Bash vs Other Shells

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sh (Bourne): 1977

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csh: 1978

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tcsh: 1983

Diagram
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Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

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Shell

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Linux

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Command Line

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Terminal

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Operating System

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DevOps

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

Bash ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

Bash ka 'Full Name' kya hai?

Complete! 🎉
COMPLETE

Bash Complete!

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