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PowerShell Troubleshooting Guide

By : Mike Shepard
Book Image

PowerShell Troubleshooting Guide

By: Mike Shepard

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PowerShell Troubleshooting Guide
Mike Shepard
Nov, 2014 | 206 pages
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Table of Contents (15 chapters)
PowerShell Troubleshooting Guide
PowerShell Troubleshooting Guide
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
PowerShell Primer
PowerShell Primer
Introduction
Cmdlets
Functions
Scripts
Pipelines
Variables
Modules
Further reading
Summary
2
PowerShell Peculiarities
PowerShell Peculiarities
PowerShell strings
Function output
Pipeline processing
PowerShell error handling
Further reading
Summary
3
PowerShell Practices
PowerShell Practices
Filter left
Format right
Comment-based help
Using Write-* cmdlets
Further reading
Summary
4
PowerShell Professionalism
PowerShell Professionalism
Naming conventions
Modularization
Version control
Unit testing
Further reading
Summary
5
Proactive PowerShell
Proactive PowerShell
Error handling
CmdletBinding()
SupportsShouldProcess
Parameter value validation
Pipeline input
Pipelines and function execution
Parameter type transformation
#REQUIRES statements
Set-StrictMode and Set-PSDebug -strict
Further reading
Summary
6
Preparing the Scripting Environment
Preparing the Scripting Environment
Validating operating system properties
Validating service status
Validating disk and memory availability
Validating network connectivity
Further reading
Summary
7
Reactive Practices – Traditional Debugging
Reactive Practices – Traditional Debugging
Reading error messages
Using Set-PSDebug
Debugging in the console
Debugging in the ISE
Event logs
The PSDiagnostics module
Using –confirm and –whatif
Reducing input set
Using Tee-Object to see intermediate results
Replacing the foreach loop with the foreach-object cmdlet
Further reading
Summary
8
PowerShell Code Smells
PowerShell Code Smells
Code smells
Language-agnostic code smells
PowerShell-specific code smells
Missing Param() statements
Homegrown common parameters
Unapproved verbs
Accumulating output objects
Sequences of assignment statements
Using untyped or [object] parameters
Static analysis tools – ScriptCop and Script Analyzer
Further reading
Summary
Index
Index

Chapter 5. Proactive PowerShell

PowerShell includes capabilities to improve the quality of scripts that will prevent some of the problems that might be encountered in the scripting process. In this chapter, we'll cover the following topics:

  • Error handling (try/catch versus trap)

  • Parameterization and pipeline input

  • Pipelines and function execution

  • Parameter validation

  • Parameter type transformation

  • Strictmode/PSDebug

  • #REQUIRES statements (version or administrator)

  • CmdletBinding and common parameters

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