The Big Book of PowerShell Error Handling
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The Big Book of PowerShell Error Handling

About the Book

Despite the title, this is actually a very small, concise book designed to help you understand how PowerShell generates and deals with errors. It's also designed to help you build the best possible error handling for your own scripts and functions, in just a few short lessons.

About the Author

The DevOps Collective, Inc.
The DevOps Collective, Inc.

The DevOps Collective, Inc. is a US-based 501(c)(3) nonprofit dedicated to changing the way the industry thinks about DevOps. All proceeds from our ebook sales benefit the organization directly. Although all books are published by DevOps Collective, they have been authored by numerous community contributors. Please see each book's "About This Book" page for author credits.

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Table of Contents

  • The Big Book of PowerShell Error Handling
  • Introduction
    • What is error handling?
    • How this book is organized
  • Powershell Error Handling Basics
    • ErrorRecords and Exceptions
    • Terminating versus Non-Terminating Errors
  • Controlling Error Reporting Behavior and Intercepting Errors
    • The $Error Variable
    • ErrorVariable
    • $MaximumErrorCount
    • ErrorAction and $ErrorActionPreference
    • Try/Catch/Finally
    • Trap
    • The $LASTEXITCODE Variable
    • The $? Variable
    • Summary
  • Analysis of Error Handling Test Results
    • Intercepting Non-Terminating Errors
    • Intercepting Terminating Errors
    • Effects of setting ErrorAction or $ErrorActionPreference
    • How PowerShell behaves when it encounters unhandled terminating errors
    • Conclusions
  • Putting It All Together
    • Suppressing errors (Mostly, don’t do this)
    • The $? variable (Use it at your own risk)
    • Determining what types of errors can be produced by a command
    • Dealing with Terminating Errors
    • Dealing with Non-Terminating Errors
    • Calling external programs
  • Afterword

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