Session - 92 | Arithmetic Operators in Bash Shell Scripts – Integers, Decimals & bc Explained

Session 92 – Arithmetic Operators in Bash Shell Scripts In this session, we explore how arithmetic operations work in Bash shell scripting, covering both integer and decimal calculations with practical examples. You’ll learn how Bash handles arithmetic expansion, how quoting affects calculations, and how to build interactive calculator scripts using user input. We also cover legacy methods like expr and modern, recommended approaches using $(( )). For decimal and floating-point arithmetic, the session explains how to use the bc command with proper precision control. Topics Covered: Arithmetic expansion using $(( )) Effect of single quotes, double quotes, and backticks Performing addition, subtraction, multiplication, division, and modulus Writing Bash scripts using read for user input Using expr vs $(( )) (best practices) Integer vs decimal arithmetic in Bash Using bc and bc -l for floating-point calculations Handling decimal precision with scale Advanced math operations (sqrt, power) using bc -l Who This Video Is For: Beginners learning Bash shell scripting Linux users preparing for interviews or certifications Students and professionals looking to write calculator scripts Anyone wanting a solid foundation in Bash arithmetic 📌 Prerequisite: Basic knowledge of Linux commands and Bash scripting 📌 Environment: Linux / UNIX shell Don’t forget to like, share, and subscribe for more Bash Shell Scripting sessions. *** 📚 Nehra Classes - Igniting The Minds! 📚 About Us: Nehra Classes is a premier IT training institute dedicated to empowering individuals with the skills and knowledge they need to succeed in today's competitive technology landscape. Founded by Vikas Nehra, a seasoned IT professional, our institute has been at the forefront of providing quality training solutions for over 10 years. *** 🕒 Timestamps: 00:00:00 - Channel Intro 00:00:26 Introduction to Arithmetic in Bash 00:01:25 Understanding Echo, Quoting, and Arithmetic Expansion 00:04:41 Creating a Basic Integer Arithmetic Script 00:06:40 Testing Addition, Subtraction, and Multiplication 00:08:31 Using the expr Command (Legacy Method) 00:11:13 Limitations of Bash with Floating-Point (Decimals) 00:11:44 Introduction to bc (Basic Calculator) 00:13:42 Piping Echo to bc for Quick Calculations 00:15:03 Scripting with bc for Decimal Operations 00:16:41 The scale Variable for Decimal Precision 00:18:05 Creating a Dynamic Decimal Calculator Script 00:19:16 Advanced Operations: Square Root and Exponents 00:23:09 Assignment and Advanced Mathematical Operations *** 🔗 Important Links: Join Our YouTube Membership: https://www.youtube.com/channel/UCvk2Fst1h1a0StSnUcvGfBQ/join Visit Our Website: https://www.nehraclasses.in Visit Our Courses Portal: https://www.nehraclasses.com Access Our Learning Portal: https://web.nehraclasses.com/login?orgCode=ljeizx Download Our Nehra Classes App: https://clpted.page.link/5cJc Android App: https://play.google.com/store/apps/details?id=co.ted.thevn iOS App (OrgCode: ljeizx): https://apps.apple.com/in/app/classplus/id1324522260 Mail Us: [email protected] *** For updates and offers follow us on Social Media: YouTube: https://www.youtube.com/@NehraClasses LinkedIn Page: https://www.linkedin.com/company/nehraclasses Telegram Channel: https://www.t.me/NehraClasses Telegram Discussion Group: https://www.t.me/NehraClassesChat WhatsApp Channel: https://whatsapp.com/channel/0029Va53a1SAYlUHpZltnY2z Facebook Page: https://www.facebook.com/nehraclasses Instagram: https://www.instagram.com/nehraclasses X Handle: https://www.x.com/nehraclasses Github Profile: https://www.github.com/nehraclasses Blog: https://nehraclassesyoutube.blogspot.com *** 📢 Stay Updated: Don’t forget to Subscribe and Hit the Bell Icon to stay notified about our latest videos, live sessions, and special offers. Like, Share, and Comment on our videos to let us know how we’re doing and what you’d like to see next! *** 🎓 Join the Nehra Classes Community: We’re more than just a channel; we’re a community of learners and educators. By joining our YouTube Membership and following us on social media, you gain access to exclusive content, live Q&A sessions, and a network of like-minded individuals. Let’s achieve your learning goals together! *** 🚀 Special Offers: Check out our current promotions, discounts, and free trials on our website and learning portal. Take advantage of these opportunities to start learning with us today! *** Thank you for being a part of Nehra Classes. Your success is our priority! *** Disclaimer: COPYRIGHT © Nehra Classes®. ALL RIGHTS RESERVED. All content, including but not limited to text, images, graphics, videos, course materials, and other digital assets available on Nehra Classes' platforms, is the exclusive property of Nehra Classes and is protected under international copyright laws. *** #NehraClasses #BashScripting #ShellScripting #LinuxTutorial #DevOps #Unix