downloads.ps1

$Downloads = (Get-Content Env:\USERPROFILE | Get-Item).GetDirectories('Downloads').GetFiles() | ForEach-Object -Parallel { $_ | Add-Member -NotePropertyName Hash -NotePropertyValue (Get-FileHash -LiteralPath $_.FullName) -PassThru }

dups.ps1

$Downloads | Group @{Expression={$_.hash.Hash}} | Where Count -GT 1 | ForEach-Object -Parallel { [System.IO.FileInfo[]]$Group = Select -InputObject $PSItem -ExpandProperty Group | Sort CreationTime; $Primary = $Group[0]; $Duplicates = $Group | Select -Skip 1; $Recovery = [int]($Duplicates | Measure-Object -Property Length -Sum | Select -Expand Sum); ([string]$Primary.Length).PadLeft(10).PadRight(12) + $Primary.Name + "`n" + ( $Duplicates | % { ''.PadRight(12) + $_.Name + "`n" } ) | Write-Host ; $Duplicates | Write-Output } | Tee-Object -Variable Duplicates | Measure-Object -Sum -Property Length | Select-Object -ExpandProperty Sum | % { [int]($_) } | Set-Variable -Name Junk ; "".PadRight(12) + "Duplicates`n" + ([string]$Junk).PadLeft(10).PadRight(12) + ($Duplicates.Name | Join-String -Separator "`n            " ) | Write-Output ; $Duplicates | Remove-Item -Confirm