How To Write Bash Scripts In Linux - Complete Guide (Part 9 - For Loops)
Understanding For Loops in Bash
Introduction to For Loops
The video series continues with a focus on for loops, building on previous concepts discussed in earlier videos.
A for loop allows repetitive execution of tasks for each item in a set, contrasting with if statements and while loops which operate under different conditions.
Structure and Functionality of For Loops
A basic example is introduced where the loop iterates through a list of numbers from 1 to 10.
Variables used within the loop do not need prior declaration; they are created when the loop starts executing.
Variable naming conventions are discussed, emphasizing that names can be descriptive or simple (e.g., using 'n' instead of 'current number').
Simplifying Scripts
The script is simplified by using curly braces to define ranges instead of manually typing each number, enhancing efficiency.
Running the simplified script confirms it correctly prints numbers 1 through 10 followed by an echo statement outside the loop.
Practical Application Example
An example involving file compression is presented, demonstrating how to create tar.gz files from log files in a specified directory.
Caution is advised when running scripts on production systems; it's recommended to test on non-production environments first.
Conclusion and Further Applications
The video concludes with suggestions for further use cases of for loops, such as automating email delivery systems for compressed files.
Viewers are encouraged to practice using for loops and explore their potential applications beyond simple examples.
Video description
In this episode of the Bash scripting course from LearnLinuxTV, you’ll learn how to use “for loops” to automate tasks across multiple items in a set. Whether you’re managing files, users, or any repeatable process, for loops are a powerful way to simplify your scripts. This tutorial explains how to set them up and provides practical examples to help you start using them effectively in your own Linux scripts.
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🕐 Time Codes
00:00 - Intro
00:42 - What are "For Loops" in Bash?
01:14 - An example of utilizing a For Loop within a Bash Script
05:56 - An example of a Bash Script with a For Loop that's actually useful!
*OTHER BASH SCRIPTING SERIES EPISODES*
- Class 01 ➜ Introduction: https://linux.video/bash1
- Class 02 ➜ Hello World: https://linux.video/bash2
- Class 03 ➜ Variables: https://linux.video/bash3
- Class 04 ➜ Math Functions: https://linux.video/bash4
- Class 05 ➜ If Statements: https://linux.video/bash5
- Class 06 ➜ Exit Codes: https://linux.video/bash6
- Class 07 ➜ While Loops: https://linux.video/bash7
- Class 08 ➜ Universal Update Script: https://linux.video/bash8
- Class 09 ➜ For Loops: https://linux.video/bash9
- Class 10 ➜ Where To Store Your Scripts: https://linux.video/bash10
- Class 11 ➜ Data Streams: https://linux.video/bash11
- Class 12 ➜ Functions: https://linux.video/bash12
- Class 13 ➜ Case Statements: https://linux.video/bash13
- Class 14 ➜ Scheduling Jobs (Part 1): https://linux.video/bash14
- Class 15 ➜ Scheduling Jobs (Part 2): https://linux.video/bash15
- Class 16 ➜ Arguments: https://linux.video/bash16
- Class 17 ➜ Building a Backup Script: https://linux.video/bash17
- Class 18 ➜ Closing: https://linux.video/bash18━━━━━━━━━━━━━━━━━━━━━━
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