In current dir rename all img with selected extension to they hash-code

rename.ps1

$Algo = "MACTripleDES"
$current = Get-Location
if ($args[0] -ne $null) {
	$Ext = $args[0]
} else {
	$Ext = ".png"
}

$files = Get-ChildItem -Path $current.Path -Recurse | Where-Object {$_.Extension -eq $Ext}
Write-Output $files
foreach ($file in $files)
{
    $fullFileName = $file.FullName
    $fileHash = Get-FileHash -Path $fullFileName -Algorithm $Algo
    $newHash = $fileHash.Hash
    $newFileName = "$newHash$Ext"
    Rename-Item -Path $fullFileName -NewName $newFileName
    Write-Output "Rename $newFileName complete!"
}