Identify files with duplicate content and remove all but one (or perform some other action on the dupe sets)

find-duplicates.ps1

$groupedDuplicates = Get-ChildItem -Recurse -File `
| Group-Object -Property Length `
| Where-Object { $_.Count -gt 1 } `
| ForEach-Object { $_.Group } `
| Get-FileHash `
| Group-Object -Property Hash `
| Where-Object { $_.Count -gt 1 } `
| ForEach-Object { $_.Group } `
| Group-Object -Property hash

for ($i = 0; $i -lt $groupedDuplicates.Count; $i++) {
    #somehow define what to delete - in this case: the longest path
    $first, $rest = @(($groupedDuplicates[$i].Group | Sort-Object { $_.Path.length }).path)
    for ($j = 0; $j -lt @($rest).Count; $j++) {
        Write-Host ("removing: "+ @($rest)[$j])
        #Remove-Item -Path  @($rest)[$j]
    }
}