Little snippet to validate the presence of a directory structure in PowerShell and initialize it if not, along with error handling and optionally verbose output.

Initialize-Directory.ps1

function Initialize-Directory {
	[CmdletBinding()]
	param(
		[Parameter(Mandatory)]
		[ValidateNotNullOrEmpty()]
		[string]$path
	)
    
    try {
	    if (-not (Test-Path $path -PathType Container)) {
		    New-Item -Path $path -ItemType Directory -Force | Out-Null
			Write-Verbose "Initialize-Directory: '$path' doesn't exist, creating structure."
	    } else {
		    Write-Verbose "Initialize-Directory: '$path' already exists, Skipping creation."
	    }
        return $true
    } catch {
        Write-Warning "Initialize-Directory: Failed to create ditectory structure at '$path'. Error: $_"
        return $false
    }
}

if ($MyInvocation.InvocationName -eq $MyInvocation.MyCommand.Name) {
	param(
		[Parameter(Mandatory)]
		[$string]$path
	)
	Initialize-Directory -Path $path
}