PowerShell Functions

Powershell functions are the most lightweight form of Powershell command, it’s a grouping of code runs against each object defined (within that code) in the script block and performs the specified action. Powershell functions help the administrator to create reusable code which acts as Powershell cmdlets.

Syntax

A function is defined as follows:

function <name>

{<statement list>}

function myfunction
{
 'Hello world'
 }

Passing arguments to function

function myfunction1
{ 
 "Hello there $args, how are you?" 
}

output

PS C:\Windows\System32> myfunction1 raj

Hello there raj, how are you?

function Adition {

Param ([int]$var,[int]$var2)

$result = $var + $var2

Write-Output $result

}

Output:

PS C:\Adition -var 10 -var2 15

25

PowerShell Advanced functions:

The PowerShell advanced functions specified with parameter attribute [cmdletbinding()], this cmdletBinding attribute is similar to the Cmdlet attribute that is used in compiled cmdlet classes to identify the class as a cmdlet.

Example

function Hello-world
{
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$true)]
        [string] $Name
    )

    Process
    {
        Write-Host ("Hello " + $Name + "!")
    }
}

Output:

PS C:\Windows\System32> Hello-world -Name raj

Hello raj!

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