Powershell list files by particular owner - powershell

Question

Beginner here.
How can I modify this script to list files owned by a particular user rather than listing every single file. For instance, I only want to see files owned by user john doe.
Set-StrictMode -Version Latest $files = Get-ChildItem foreach($file in $files) {$owner=(Get-Acl $file).Owner $file | Add-Member NoteProperty Owner $owner $file}
Your help is greatly appreciated.

Answer 1

Try something like this:
$files = Get-ChildItem | Select *,#{n='Owner';e={(Get-Acl $_).Owner}} |
Where {!$_.PSIsContainer -and ($_.Owner -eq 'Domain\name')}
On V3 you can simplify this to:
$files = Get-ChildItem -File | Select *,#{n='Owner';e={(Get-Acl $_).Owner}} |
Where {$_.Owner -eq 'Domain\name'}

Answer 2

The simplest I've found is:
Get-ChildItem | Get-Acl | Where-Object { $_.Owner -match 'Domain\username' }

Answer 3

This might be faster:
$Owner = 'user1'
$SID = (Get-ADUser $Owner).sid
Get-ChildItem |
where { (Get-Acl $_).sddl -like "O:$SID*" } |
select *,#{l='Owner';e={$Owner}}
The ACL is stored as an SDDL string. The SID of file owner will always be at the beginning of the SDDL string, prefixed with O:. NTFS has to resolve the SIDs to an owner name. It takes less time to do a string match for the SID than to do the lookup and then match the name. It's not much, and it won't make much difference just doing a file or 10, but it starts to add up when you start doing thousands of them.

Answer 4

Another variant, but using .NET's File.GetAccessControl https://learn.microsoft.com/en-us/dotnet/api/system.io.file.getaccesscontrol?view=netframework-4.8 instead of Get-Acl cmdlet.
Credit to Get File Owner/Author
Get-ChildItem <path> -File | Select-Object fullname, LastAccessTime, LastWriteTime, CreationTime, #{N='Owner';E={$_.GetAccessControl().Owner}}