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

Variable commands


A number of commands are available to interact with variables:

  • Clear-Variable
  • Get-Variable
  • New-Variable
  • Remove-Variable
  • Set-Variable

Clear-Variable

Clear-Variable removes the value from any existing variable. Clear-Variable does not remove the variable itself. For example, the following example calls Write-Host twice: the first time it writes the variable value; the second time it does not write anything:

PS> $temporaryValue = "Some-Value"
Write-Host $temporaryValue -ForegroundColor Green

Some-Value

PS> Clear-Variable temporaryValue
Write-Host $temporaryValue -ForegroundColor Green

Get-Variable

Get-Variable provides access to any variable that has been created in the current session as well as the default (automatic) variables created by PowerShell. For further information on automatic variables, see about_Automatic_Variables (Get-Help about_Automatic_Variables).

When using the *-Variable commands, the $ preceding the variable name is not considered part of the name.

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