PowerShell script to create a marker file in each empty directory under a given root directory

Create-MarkerFiles.ps1

<# .SYNOPSIS
     Create a marker file in each empty directory under a given root directory 
.DESCRIPTION
     This script recursively finds empty directories under the given root
     directory and creates a marker file with the given filename in each one.
.NOTES
     Author : Pat Patterson
#>

[CmdletBinding(SupportsShouldProcess)]

param (
    [Parameter(Mandatory, HelpMessage='Specifies the root directory from which to start.')]
    [string]
        $RootDirectory, 

    [Parameter(Mandatory, HelpMessage='Specifies the name of the marker file.')]
    [string]
        $Filename
)

# Initialize array for marker file paths
$paths = @()

# Recurse from the given root directory
Get-ChildItem -Path $RootDirectory -Recurse | 
    # Is the item a directory?
    ? {$_.PSIsContainer -eq $True} | 
    # Is the directory empty?
    ? {$_.GetFileSystemInfos().Count -eq 0} | 
    ForEach-Object {
        # Make the marker file path and append it to the array
        $path = $_.FullName + "/" + $Filename
        $paths += $path
        # If the user specified -WhatIf, then display the paths after ShouldProcess
        # so we get the 'What if:' output. Otherwise display them before the confirmation
        if (!$WhatIfPreference) {
            # Output the marker file path
            Write-Host "$($path)"        
        }
    }

if ($PSCmdlet.ShouldProcess($RootDirectory)) {
    # No -Confirm parameter, or user confirmed
    ForEach ($path in $paths) {
        # Create the marker file
        New-Item -Path $path -ItemType "file" -Confirm:$False | Out-Null                    
    }
} elseif ($WhatIfPreference) {
    # User specified -WhatIf
    ForEach ($path in $paths) {
        # Output the marker file path
        Write-Host "$($path)"        
    }
}

# Wait for confirmation before exiting
Read-Host -Prompt "Press Enter to exit"