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BCA-204N · Unix and Shell Programming
Unit 5

Control Structures, Functions & System Administration

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Unit 5 Learning Hub

Control Structures, Functions & System Administration

Official MJPRU BCA Unit 5: Control Structures, Functions & System Administration for BCA-204N (Unix and Shell Programming).

Syllabus Topics:Conditional Control Structures: Simple if-then-fi, if-then-else-fi, if-then-elif-else-fi Multi-Way BranchingPattern Matching with case Statement: case $var in pattern1) ... ;; pattern2) ... ;; *) ... ;; esac ArchitectureLooping Structures - while Loop: Condition-Based Entry-Controlled Iteration, Infinite while LoopsLooping Structures - until Loop: Iterating Until Condition Evaluates to TrueLooping Structures - for Loop: Word List Iteration (for var in list; do ... done), C-Style For Loop (for ((i=0; i<n; i++)))Jumping Control Structures: break (Exit Loop), break n (Break Nested Loops), continue (Skip to Next Iteration), exit statusShell Functions: Defining Functions (fname() { ... }), Passing Arguments to Functions ($1, $2 inside functions), return vs echo OutputFile Descriptors and Advanced I/O Redirection: Custom File Descriptors (exec 3<file), Here Documents (<<EOF), Here Strings (<<<)Signal Trapping in Scripts: trap Command, Handling SIGINT (Ctrl-C), Cleaning Up Temporary Files on Script AbortUNIX File Permissions & Security: User, Group, Others (rwx), Octal Notation (chmod 755, 644), chown, chgrp, umask MechanicsSystem Administration & Automation: Cron Daemon, crontab File Format (* * * * * command), at Command for Single ExecutionBackup & Archival Scripting: Automated Log Rotation, Compression Scripts, Remote Copying with scp and rsync
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Introduction to Computers & The IPO Cycle

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Topic 1 · The foundation of modern computing

Introduction to Computers & The IPO Cycle

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Ready to master this concept? Give it a quick read & tap the check!

💡 The Big Picture:A computer is an electronic system that takes raw data as Input, processes it under programmed logic, and produces meaningful Information as Output.
🍪 Everyday Analogy:Think of baking cookies: Flour & Sugar (Input) ➔ The Oven (Processing) ➔ Warm Delicious Cookie (Output)! 🍪
Key Exam Takeaways
  • ·Data = Raw, unprocessed facts without context (e.g. 42, 'apple').
  • ·Information = Structured data with meaning (e.g. 'Temperature: 42°C').
  • ·Hardware is what you can touch; Software is the instructions running inside.
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Which of the following represents unprocessed raw facts?

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