Find duplicated files with powershell

list-duplicated-files.ps1

Get-ChildItem -Recurse -File | 
    Group-Object Length | 
    Where-Object { $_.Count -gt 1 } | 
    select -ExpandProperty group | 
    foreach { Get-FileHash -LiteralPath $_.FullName } | 
    group -Property hash | 
    where { $_.count -gt 1 } | 
    select -ExpandProperty group

sort-by-filename-list-only-filename.ps1

Get-ChildItem -Recurse -File | 
  Group-Object Name | 
  Where-Object { $_.Count -gt 1 } | 
  Select -ExpandProperty Group | 
  foreach { Get-FileHash -LiteralPath $_.FullName } | 
  group -Property hash | 
  where { $_.count -gt 1 } | 
  select -ExpandProperty group | 
  %{ $_.path }

sort-by-filename.ps1

Get-ChildItem -Recurse -File | 
  Group-Object Name | 
  Where-Object { $_.Count -gt 1 } | 
  Select -ExpandProperty Group | 
  foreach { Get-FileHash -LiteralPath $_.FullName } | 
  group -Property hash | 
  where { $_.count -gt 1 } | 
  select -ExpandProperty group