WinOSFileSystemSizes.ps1

Param (
         [parameter (
                      Mandatory=$true
                    , position=0
                    , HelpMessage="Please enter folder name"
                   )
          ]
 
          [alias("f")]
 
          [string] $folder = "."
		  
	  )		

<#
    Set strict mode
#>
Set-StrictMode -Version 1.0

[string]  $log="";
[object]  $objFSItems=$Null;

[long]    $lNumberofFiles=0;
[long]    $_total=0;
[long]    $_grandtotal=0;
[object]  $objListofFolders=$Null;

[string]  $folderDetail="";
[string]  $formatDetail="";
[string]  $formatTotal="";

[long]    $_value = 0;
[long]    $_sizeMB = 0;
[long]	  $_grandTotal = 0;

$folderDetail = "Folder => {0}"; 
$formatDetail = "`t Size = {0:n3} {1}";
$formatTotal  = "`r`n`r`nTotal Size = {0:n3} {1}";

#validate folder existence
$folderExist = test-path -isvalid $folder;

#If folder does not exists, say SO
if ($folderExist -eq $False)
{
	$log = "Folder {0} does not exist" -f $folder;
	
	Write-Warning $log
	
	exit
}


#Get folder and file list
$objFSItems = Get-ChildItem $folder -recurse -Force -ErrorAction SilentlyContinue;

# Process file size	
$lNumberofFiles =0;

$objListofFolders=@{};
 
# Iterate files	
$objFSItems | Foreach-Object {

	# Number of files
	$lNumberofFiles = $lNumberofFiles +1;

	# Get full file name 	
	$_fileNameFull = $_.FullName;

	# Get file name
	$_fileName = $_.Name;
	
	#get folder name
	$_folderName = $($_fileNameFull | split-path -parent)
	
	#is container
	$_isContainer = $_.PSIsContainer;
	
	#get lenght
	$_length = $_.Length;
	
	if ($_isContainer -eq $True)
	{
	
		#is container registered
		$objItem = $objListofFolders.Item($_folderName);
	
		if ($objItem -eq $Null)
		{
			$objListofFolders.Add($_folderName, 0);
		}
	}

	if ($_isContainer -eq $False)
	{
	
		$_total = $objListofFolders[$_folderName];
	
		$objListofFolders.Set_Item($_folderName, $_total + $_length);
	
	}
	

	
}

	
$_grandtotal =0;
	
$objListofFolders.GetEnumerator() | Sort-Object Name | ForEach-Object{

	$_value = $($_.value);
	
	$_sizeMB = $($_.value) / ( 1MB);
	
	$_grandTotal = $_grandTotal + ($_.value);
 	
	$log = $folderDetail -f $($_.key);
	
	Write-Output $log
	
	<#
		Only show sizes for folders that have files
	#>
	if ($_value -gt 0)
	{
		Write-Output ($formatDetail -f $_sizeMB, "MB");
	}
}

$_grandTotalGB = $_grandTotal / ( 1GB);
	
$log = $formatTotal -f $_grandTotalGB, "GB";
	
Write-Host $log -ForegroundColor Blue;