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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)
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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

Validating disk and memory availability

Trying to run a script on a system that is out of memory or disk space is a frustrating experience. An important piece of preparation is to determine the amount of memory and disk space present as well as how much of each is unused. Retrieving these statistics with WMI is a simple matter, and with a bit of effort we can make the results more user-friendly.

We already encountered the Win32_OperatingSystem class in the first part of this chapter. Fortunately for us, there are two properties on this class that will tell us both the total amount and the free amount of memory.

Get-CIMInstance Win32_OperatingSystem | 
  Select-object FreePhysicalMemory,TotalVisibleMemorySize

The output on my laptop is this:

Since we're going to probably want to see these in a different unit than kilobytes, we can use a trick recommended by Jeffery Hicks (Microsoft MVP in PowerShell) to add script properties to the class returned by get-CIMInstance:

Update-TypeData -TypeName...
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Tech Concepts
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Programming languages
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PowerShell Troubleshooting Guide
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