Book Image

Mastering PowerShell Scripting - Fourth Edition

By : Chris Dent
5 (1)
Book Image

Mastering PowerShell Scripting - Fourth Edition

5 (1)
By: Chris Dent

Overview of this book

PowerShell scripts offer a convenient way to automate various tasks, but working with them can be daunting. Mastering PowerShell Scripting takes away the fear and helps you navigate through PowerShell's capabilities.This extensively revised edition includes new chapters on debugging and troubleshooting and creating GUIs (online chapter). Learn the new features of PowerShell 7.1 by working with parameters, objects, and .NET classes from within PowerShell 7.1. This comprehensive guide starts with the basics before moving on to advanced topics, including asynchronous processing, desired state configuration, using more complex scripts and filters, debugging issues, and error-handling techniques. Explore how to efficiently manage substantial amounts of data and interact with other services using PowerShell 7.1. This book will help you to make the most of PowerShell's automation features, using different methods to parse data, manipulate regular expressions, and work with Windows Management Instrumentation (WMI).
Table of Contents (26 chapters)
24
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25
Index

Variable commands

The following commands are used to work with variables:

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

When using the variable commands, the $ preceding the variable name is not considered part of the name; $ tells PowerShell what follows is a variable name.

Clear-Variable

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

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

Get-Variable

The Get-Variable command provides access to any variable that has been created in the current session as...