Get only last revision from a Schoology submissions download

SchoologyGetLatestSubmissions

# (c) Michiel van der Blonk
# blonkm@gmail.com
# @name SchoologyGetLatestSubmissions.ps1
# @date 2015-06-12
# @description Get only last revision from a Schoology submissions download
# @notes copies files to a new folder on the destination named schoology_<date>
# @args 
#	path		defaults to current directory
#	destination	defaults to desktop

# allow scripts (you can open powershell as administrator and run this command too):
# Set-ExecutionPolicy RemoteSigned 
# or you can run from command line using:
# powershell -ExecutionPolicy Bypass -file SchoologyGetLatestSubmissions.ps1

Param (
    $path = ".",
    $destination = "desktop"
)
 
if ($destination -eq "desktop") {
	$destination = [Environment]::GetFolderPath("Desktop") 
}
$now = $(get-date -f MM-dd-yyyy_HH_mm_ss)
$copies = md -Path $destination"\schoology_"$now -Force
$d = $path 
# get all student folders
ls $d | where {$_.Attributes -match 'Directory'} | % {
    # get the last revision
    $student = $_.Name
    ls -Path $_.FullName | sort LastWriteTime | select -last 1 | % {
            # get files in this folder
            ls -Path $_.FullName  | Where-Object { ! $_.PSIsContainer } | % {
                # copy files to desktop folder
                $extension = $_.extension
                Copy-Item $_.FullName $copies"\"$student$extension
                Echo $_.FullName
                }
        }
}
Echo "Completed"