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Mastering PowerShell Scripting

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

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Product type Paperback
Published in Jun 2021
Publisher Packt
ISBN-13 9781800206540
Length 788 pages
Edition 4th Edition
Languages
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Author (1):
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Chris Dent Chris Dent
Author Profile Icon Chris Dent
Chris Dent
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Table of Contents (26) Chapters Close

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

Raising errors

When writing a script, it may be desirable to use errors to notify the person running the script of a problem. The severity of the problem will dictate whether an error is non-terminating or terminating.

If a script makes a single change to many diverse, unrelated objects, a terminating error might be frustrating for anyone using the script.

On the other hand, if a script fails to read a critical configuration file, a terminating error is likely the right choice.

Error records

When an error is raised in PowerShell, an ErrorRecord object is created (explicitly or implicitly).

An ErrorRecord object contains several fields that are useful for diagnosing an error. ErrorRecord can be explored using Get-Member or by using the Get-Error command.

For example, an ErrorRecord will be generated when attempting to divide by 0:

100 / 0 
$record = $Error[0] 

The ErrorRecord object that was generated includes ScriptStackTrace, which includes the script...

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