[zeugma]

I don't know. Tell me how you'd find a list of all duplicate files on your computer with powershell. I'm talking of actual duplicate files here. The names may be different, but the files are exactly the same by actual content.

I have a 5-line bit of shellcode that does a pretty good job of it.

[tacticalogic]

In the current version (V4)

$md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
$ht = @{}
get-childitem c:\ -Recurse -File |
Select -ExpandProperty FullName |
foreach {
$hash = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($_.FullName)))
$ht[$hash] += @($_.FullName)
}

$ht.GetEnumerator() |
Where {$_.Value.count -gt 1}

V5, which will be released with Windows 10 has a Get-FileHash command that would simplify that down to about half as many lines of code.

So, by what measure is that not nearly as powerful as sed, awk, and grep ( assuming that’s what your 5-line bit of shell code is using to find those duplicate files).