Book Image

Mastering Windows PowerShell Scripting (Second Edition) - Second Edition

By : Brenton J.W. Blawat
Book Image

Mastering Windows PowerShell Scripting (Second Edition) - Second Edition

By: Brenton J.W. Blawat

Overview of this book

PowerShell scripts offer a handy way to automate various chores. Working with these scripts effectively can be a difficult task. This comprehensive guide starts from scratch and covers advanced-level topics to make you a PowerShell expert. The first module, PowerShell Fundamentals, begins with new features, installing PowerShell on Linux, working with parameters and objects, and also how you can work with .NET classes from within PowerShell. In the next module, you’ll see how to efficiently manage large amounts of data and interact with other services using PowerShell. You’ll be able to make the most of PowerShell’s powerful automation feature, where you will have different methods to parse and manipulate data, regular expressions, and WMI. After automation, you will enter the Extending PowerShell module, which covers topics such as asynchronous processing and, creating modules. The final step is to secure your PowerShell, so you will land in the last module, Securing and Debugging PowerShell, which covers PowerShell execution policies, error handling techniques, and testing. By the end of the book, you will be an expert in using the PowerShell language.
Table of Contents (24 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Arithmetic operators


Arithmetic operators are used to perform numeric calculations. The operators available are the following:

  • Addition: +
  • Subtraction: -
  • Multiplication: *
  • Division: /
  • Modulus: %
  • Shift left: -shl
  • Shift right: -shr

As well as numeric calculations, the addition operator may also be used with strings, arrays, and hashtables; the multiplication operator may also be used with strings and arrays.

Operator precedence

Mathematical operations are executed in a specific order. For example, consider the following two simple calculations:

3 + 2 * 2 
2 * 2 + 3 

The result of both of the preceding expressions is 7 (2 multiplied by 2, then add 3).

PowerShell, and most other programming languages, will calculate elements of an expression using multiplication (*), division (/), and modulus (%) first. Addition (+) and subtraction (-) are calculated next.

PowerShell has two additional operators in this category, -shl and -shr. These two have the lowest precedence and are only executed once all other operations...