Flattens a folder tree by moving all files to a new destination folder

FlattenFolder.ps1

# Flatten a folder tree by moving contents of the source path 
# recursively to the destination path.
#
# If there is a collision in the destination due to two files 
# having the same name, then a timestamp is appended to the
# base name of the file being moved to create a new unique name.

Clear-Host

$sourceFolderFullPath = "c:\source"
$destinationFolderFullPath = "c:\destination"

Get-ChildItem -File -Recurse -Path $sourceFolderFullPath -Filter *.* | `
	ForEach-Object `
	{
		$newName = "$destinationFolderFullPath\$_"				
			
		If (Test-Path -Path $newName)
		{
			$timestamp = Get-Date -Format o | foreach {$_ -Replace ":", "."}
			$newName = "$destinationFolderFullPath\$($_.BaseName)_$timestamp$($_.Extension)"
		}
		
		"Moving $($_.FullName) to $newName"
		Move-Item -Path $_.FullName -Destination $newName
	}