Essential Books

Mandatory Parameters

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Parameters to a function can be marked as mandatory 

function Get-Greeting{
    param
    (
        [Parameter(Mandatory=$true)]$name
    )
    "Hello World $name"
}

If the function is invoked without a value, the command line will prompt for the value: 

$greeting = Get-Greeting 

cmdlet Get-Greeting at command pipeline position 1
Supply values for the following parameters:
name:
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PowerShell functions:
* PowerShell Functions
* Basic Parameters
* Advanced Function
* Mandatory Parameters
* Parameter Validation
* Simple Function with No Parameters
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