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  • Book Overview & Buying PowerShell Troubleshooting Guide
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PowerShell Troubleshooting Guide

PowerShell Troubleshooting Guide

By : Michael Shepard
4.7 (3)
Buy this Book
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PowerShell Troubleshooting Guide

PowerShell Troubleshooting Guide

4.7 (3)
By: Michael Shepard
Buy this Book

Overview of this book

The techniques in this book apply to beginners who have just started to learn PowerShell, as well as advanced scripters who have a good grasp of the language.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. PowerShell Primer
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1. PowerShell Primer
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Introduction
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Cmdlets
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Functions
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Scripts
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Pipelines
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Variables
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Modules
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Further reading
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Summary
2
2. PowerShell Peculiarities
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2. PowerShell Peculiarities
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PowerShell strings
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Function output
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Pipeline processing
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PowerShell error handling
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Further reading
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Summary
3
3. PowerShell Practices
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3. PowerShell Practices
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Filter left
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Format right
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Comment-based help
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Using Write-* cmdlets
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Further reading
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Summary
4
4. PowerShell Professionalism
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4. PowerShell Professionalism
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Naming conventions
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Modularization
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Version control
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Unit testing
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Further reading
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Summary
5
5. Proactive PowerShell
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5. Proactive PowerShell
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Error handling
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CmdletBinding()
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SupportsShouldProcess
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Parameter value validation
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Pipeline input
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Pipelines and function execution
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Parameter type transformation
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#REQUIRES statements
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Set-StrictMode and Set-PSDebug -strict
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Further reading
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Summary
6
6. Preparing the Scripting Environment
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6. Preparing the Scripting Environment
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Validating operating system properties
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Validating service status
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Validating disk and memory availability
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Validating network connectivity
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Further reading
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Summary
7
7. Reactive Practices – Traditional Debugging
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7. Reactive Practices – Traditional Debugging
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Reading error messages
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Using Set-PSDebug
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Debugging in the console
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Debugging in the ISE
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Event logs
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The PSDiagnostics module
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Using –confirm and –whatif
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Reducing input set
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Using Tee-Object to see intermediate results
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Replacing the foreach loop with the foreach-object cmdlet
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Further reading
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Summary
8
8. PowerShell Code Smells
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8. PowerShell Code Smells
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Code smells
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Language-agnostic code smells
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PowerShell-specific code smells
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Missing Param() statements
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Homegrown common parameters
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Unapproved verbs
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Accumulating output objects
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Sequences of assignment statements
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Using untyped or [object] parameters
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Static analysis tools – ScriptCop and Script Analyzer
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Further reading
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Summary
9
Index
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Index

Function output

The example function included in Chapter 1, PowerShell Primer, used string substitution and returned the single result of that operation. As a reminder, here it is again:

function Get-PowerShellVersionMessage{
param($name)
    $PowerShellVersion=$PSVersionTable.PSVersion
    return "We're using $PowerShellVersion, $name!"
}

This pattern (that is, performing a calculation and returning the result) is common to procedural programming languages such as C#, Java, and Visual Basic. In PowerShell, however, functions are more complicated than the usage in this scenario in several ways.

In statically-typed languages, the type of a function (that is, the type of a value returned by the function) is either declared as part of the function definition or inferred by the compiler. In PowerShell, the only consideration of a type associated with the output of a function is in the help provided for the function. This output type can be used by a PowerShell host to guide IntelliSense...

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Tech Concepts
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Programming languages
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PowerShell Troubleshooting Guide
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