how to find all activated farm features?

Question

How can I find all activated Farm features using PowerShell?

All installed Farm features can be found using:

Get-SPFeature -farm

Answer 1

this MS developer blog by Joe Rodgers helped us with:

Get-SPWeb http://sharepoint2010/subsite | % {

    $results = @()

    Get-SPFeature -Web $_ -Limit All | % {

        $feature = $_; 
        $featuresDefn = (Get-SPFarm).FeatureDefinitions[$_.ID]; 
        $cc = [System.Globalization.CultureInfo]::CurrentCulture;

        $obj = New-Object PSObject;
        $obj | Add-Member NoteProperty  Title  $($featuresDefn.GetTitle($cc));
        $obj | Add-Member NoteProperty  Hidden $($feature.Hidden);

        $results += $obj;
    }
    $results | FT -Auto;
}

Answer 2

As per msdn

The Get-SPFeature cmdlet behaves differently at each scope, returning the enabled Features at each level. If no scope is provided, all installed Features are returned

That means below command will return only active list of features

Get-SPFeature -Farm

Here is another snippet that gives the same result

$siteFeatures = Get-SPFeature | Where-Object {$_.Scope -eq "Farm" }
if ($siteFeatures -ne $null) {
    foreach ($feature in $siteFeatures) {
        if ((Get-SPFeature -Farm | Where-Object {$_.Id -eq $feature.id}) -neq $null) {
       Write-Host "$($feature.Scope) feature $($feature.DisplayName) " -ForeGroundColor DarkRed
       }
   }
}

Answer 3

You need to get the activated features by the AdministrationService

Powershell :

[Microsoft.SharePoint.Administration.SPWebService]::AdministrationService.Features

C# :

Microsoft.SharePoint.Administration.SPWebService.AdministrationService.Features