Windows Classroom Series – 16/Oct/2020

Functions in Powershell

• They help in increasing reusability.
• Functions can be written and put in the modules path ‘$env:PSModulePath’
• Naming:
  • Generally it is a good practice to name your functions using <ApprovedVerb>-<Prefix><Noun>
  • Examples:
    • Write ps functions for admin team to get the chrome process Get-AdmChromeProcess, Kill-AdmChromeProcess
  • Use Verbs from approved list Get-Verb
• Writing a simple function to return the Version of Powershell
• Function Syntax

function FunctionName {
    param (
        OptionalParameters
    )
    
}

How-To’s to be learnt

• How to make function resuable from powershell terminal?
• How to make use of parameters effectively?
  • Include types
  • Mandatory Parameters
  • Optional Parameters
• How to document powershell functions?

Syntax for a Powershell function

• The following is a syntax of powershell

function [<scope>]<name> [([type] $parameter1[, [type] $parameter2])]
{
    param([type]$parameter1[, [type] $parameter2] )
    dynamicparam { <statement list> }
    begin { <statement list> }
    process { <statement list> }
    end { <statement list> }
}

• Begin Block: This block is executed before pipeline-processing starts.
• Process Block: The contents of Process block run once for each value received in the pipeline. The $_ variable to access objects
• End Block : This block will be executed after all the objects in the process block have been processed
• Refer Here for the samples created in class.

Next Topic

• Windows Active Directory.