PowerShell Functions

Jun 29, 2010Download as ppt, pdf

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The document discusses PowerShell functions including their structure, guidelines, input/output parameters, scope, use in pipelines, and comment-based help. PowerShell functions allow reusable blocks of code to be defined and behave similar to cmdlets. They can take parameters, return output, and be used in scripts, profiles, or modules. Functions provide a way to encapsulate and reuse code along with features like parameter handling and scoping rules.

PowerShell Functions Presented by Mike Pfeiffer http://www.AZPoSH.com

Agenda PowerShell Functions What is a PowerShell Function? Structure of a PowerShell Function Function Guidelines Input Parameters Output Scope Functions in the Pipeline Begin, Process and End Blocks Parameter Attributes Comment Based Help

Function Guidelines Must be defined before they are called Call functions without parenthesis or commas: Get-MyStuff –Param1 $value1 –Param2 $value2 Get-MyStuff $value1 $value2

Input Parameters The $args variable Named and positional parameters Parameter type constraints Initializing parameters with default values The switch parameter

Output Write-Host is for writing to the console Use Write-Output to return function output Don’t use the Return keyword to return output

Scope Functions have internal scope Don’t use or modify variables from parent scope Consider using default values for internal variables

Functions in the Pipeline The $input variable Filters

Parameter Attributes Parameter Attribute Declaration (MSDN): http://bit.ly/bzGu34

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PowerShell Functions

1. PowerShell Functions Presented by Mike Pfeiffer http://www.AZPoSH.com

2. Agenda PowerShell Functions What is a PowerShell Function? Structure of a PowerShell Function Function Guidelines Input Parameters Output Scope Functions in the Pipeline Begin, Process and End Blocks Parameter Attributes Comment Based Help

3. What is a PowerShell Function? Think of it as a block of code that behaves as a cmdlet Can be loaded from your profile, dot sourced via a script, or imported from a module Can be called or defined in another function or script

4. Structure of a PowerShell Function

5. Function Guidelines Must be defined before they are called Call functions without parenthesis or commas: Get-MyStuff –Param1 $value1 –Param2 $value2 Get-MyStuff $value1 $value2

6. Input Parameters The $args variable Named and positional parameters Parameter type constraints Initializing parameters with default values The switch parameter

7. Output Write-Host is for writing to the console Use Write-Output to return function output Don’t use the Return keyword to return output

8. Scope Functions have internal scope Don’t use or modify variables from parent scope Consider using default values for internal variables

9. Functions in the Pipeline The $input variable Filters

10. Begin, Process and End Blocks

11. Parameter Attributes Parameter Attribute Declaration (MSDN): http://bit.ly/bzGu34

12. Comment Based Help

13. Resources Get-Help About_Functions Get-Help About_Functions_Advanced Get-Help About_Comment_Based_Help PowerShell in Action http://manning.com/payette2/ PowerGUI PowerShell v2 Snippets http://bit.ly/azDkJG

14. Thank You!

PowerShell Functions

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