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Mastering PowerShell Scripting

You're reading from Mastering PowerShell Scripting Automate and manage your environment using PowerShell 7.1

Product type Paperback

Published in Jun 2021

Publisher Packt

ISBN-13 9781800206540

Length 788 pages

Edition 4th Edition

Languages

PowerShell

Tools

PowerShell

Concepts

System Administration

Author (1):

Chris Dent

View More author details

Table of Contents (26) Chapters

Preface

1. Introduction to PowerShell

2. Modules and Snap-Ins FREE CHAPTER

3. Working with Objects in PowerShell

4. Operators

5. Variables, Arrays, and Hashtables

6. Conditional Statements and Loops

7. Working with .NET

8. Strings, Numbers, and Dates

9. Regular Expressions

10. Files, Folders, and the Registry

11. Windows Management Instrumentation

12. Working with HTML, XML, and JSON

13. Web Requests and Web Services

14. Remoting and Remote Management

15. Asynchronous Processing

16. Graphical User Interfaces

17. Scripts, Functions, and Script Blocks

18. Parameters, Validation, and Dynamic Parameters

19. Classes and Enumerations

20. Building Modules

21. Testing

22. Error Handling

23. Debugging and Troubleshooting

24. Other Books You May Enjoy

25. Index

Comparing

You can use the Compare-Object command to compare collections of objects with one another.

Compare-Object must be supplied with values for the ReferenceObject and DifferenceObject parameters, which are normally collections or arrays of objects. If either value is null, then an error will be displayed. If both values are equal, Compare-Object does not return anything by default. For example, the reference and difference objects in the following example are identical:

Compare-Object -ReferenceObject 1, 2 -DifferenceObject 1, 2

If there are differences, Compare-Object displays the results, as shown here:

PS> Compare-Object -ReferenceObject 1, 2, 3, 4 -DifferenceObject 1, 2
InputObject SideIndicator
----------- -------------
          3 <=
          4 <=

This shows that ReferenceObject (the collection on the left, denoted by the direction of the <= arrow) has the values, but DifferenceObject (the collection on the right) does not.

Compare...

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Authors (1)

Chris Dent

Chris Dent

Chris Dent is an automation specialist with deep expertise in the PowerShell language. Chris is often found answering questions about PowerShell in both the UK and virtual PowerShell user groups. Chris has been developing in PowerShell since 2007 and has released several modules over the years.

See other products by Chris Dent

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