GDT

Module Title: dgt_bash03 – Arithmetic expressions

module Description:

Welcome to “dgt_bash03 – Arithmetic expression,” a comprehensive module designed to equip you with the skills and knowledge necessary to master arithmetic expressions in Bash scripting. This module is ideal for individuals looking to enhance their shell scripting capabilities, whether youre a beginner or an experienced user aiming to deepen your understanding of numerical operations within scripts.

module Objectives:

• Understand the basics of arithmetic expressions in Bash.
• Learn how to declare and perform various arithmetic operations using different methods available in Bash.
• Gain hands-on experience through practical examples and exercises.
• Master techniques for handling complex mathematical calculations within shell scripts.
• Develop the ability to write efficient and error-free arithmetic expressions.

Key Topics Covered:

1. Introduction to Arithmetic in Bash
2. Overview of why arithmetic operations are essential in scripting.

3. Basic syntax and structure of arithmetic expressions.

4. Arithmetic Operators in Bash

5. Detailed exploration of supported operators: addition, subtraction, multiplication, division, modulus, etc.

6. Understanding operator precedence and how it affects calculations.

7. Methods for Performing Arithmetic Operations

8. Using let command for simple calculations.
9. Employing the double parentheses syntax for more complex expressions.
10. Utilizing $ syntax for arithmetic evaluation within scripts.

11. Exploring alternative approaches like expr and external tools e.g., bc for specialized operations.

12. Examples of Arithmetic Declaration in Bash

13. Practical examples demonstrating each method:

    • Using let:
      bash
let "a = 5 + 3"
echo $a
    • Double Parentheses:
      bash
b = a * 2
echo $b
    • $ Syntax:
      bash
c=$ b / 4
echo $c

14. Advanced Arithmetic Techniques

15. Handling floating-point arithmetic.
16. Integrating external tools for complex calculations.

17. Error handling and validation in arithmetic operations.

18. Best Practices and Optimization

19. Writing clean, readable, and maintainable code.
20. Performance considerations when using different methods.
21. Debugging common issues in arithmetic expressions.

module Format:

• Interactive lectures with live coding demonstrations.
• Hands-on labs where participants can practice writing and testing their own scripts.
• Real-world examples to illustrate the application of concepts learned.
• Quizzes and assignments to reinforce learning and assess understanding.
• A supportive online community for ongoing discussion and troubleshooting.

By the end of this module, you will be proficient in using Bash to perform a wide range of arithmetic operations efficiently and effectively. Whether you are automating tasks or developing complex scripts, these skills will empower you to leverage the full potential of shell scripting in your projects.
The students can push their exercises to the Academy DevOps & SRE GIT project. For this module, create a folder with your username as its name in the following subfolder: https://github.com/Garanti-Del-Talento/gdt_academy