param([String] $Username=$env:USERNAME)

function czyJestWGrupie ([String] $user, [Object] $group){
    foreach ($name in Get-LocalGroupMember -Group $group.Name){
        if ($name.toString() -eq $user){
            return $true
        }
    }
    
    #jeśli nie znajdzie zwraca fałsz.
    return $false 
}

Write-Output("Użytkownik:")
Write-Output $Username

$Username+=$env:USERNAME+""
foreach ($group in Get-LocalGroup) {
    if (czyJestWGrupie $Username $group) {
        Write-Output $group.Name
    }
    

}
exit 0