PowerShell Script To Find Where SharePoint 2007 Features Are Activated

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function Get-SPFeatureActivated
{
# see full script for help info, removed for formatting
[CmdletBinding()]
param(
    [Parameter(position = 1, valueFromPipeline=$true)]
    [string]
    $Identity
)#end param
    Begin
    {
        # load SharePoint assembly to access object model
        [void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")

        # declare empty array to hold results. Will add custom member for Url to show where activated at on objects returned from Get-SPFeature.
        $results = @()

        $params = @{}
    }
    Process
    {
        if([string]::IsNullOrEmpty($Identity) -eq $false)
        {
            $params = @{Identity = $Identity}
        }

        # create hashtable of farm features to lookup definition ids later
        $farm = [Microsoft.SharePoint.Administration.SPFarm]::Local

        # check farm features
        $results += ($farm.FeatureDefinitions | Where-Object {$_.Scope -eq "Farm"} | Where-Object {[string]::IsNullOrEmpty($Identity) -or ($_.DisplayName -eq $Identity)} |
                         % {Add-Member -InputObject $_ -MemberType noteproperty -Name Url -Value ([string]::Empty) -PassThru} |
                         Select-Object -Property Scope, DisplayName, Id, Url)

        # check web application features
        $contentWebAppServices = $farm.services | ? {$_.typename -like "Windows SharePoint Services Web Application"}

        foreach($webApp in $contentWebAppServices.WebApplications)
        {
            $results += ($webApp.Features | Select-Object -ExpandProperty Definition | Where-Object {[string]::IsNullOrEmpty($Identity) -or ($_.DisplayName -eq $Identity)} |
                         % {Add-Member -InputObject $_ -MemberType noteproperty -Name Url -Value $webApp.GetResponseUri(0).AbsoluteUri -PassThru} |
                         Select-Object -Property Scope, DisplayName, Id, Url)

            # check site collection features in current web app
            foreach($site in ($webApp.Sites))
            {
                $results += ($site.Features | Select-Object -ExpandProperty Definition | Where-Object {[string]::IsNullOrEmpty($Identity) -or ($_.DisplayName -eq $Identity)} |
                                 % {Add-Member -InputObject $_ -MemberType noteproperty -Name Url -Value $site.Url -PassThru} |
                                 Select-Object -Property Scope, DisplayName, Id, Url)

                # check site features in current site collection
                foreach($web in ($site.AllWebs))
                {
                    $results += ($web.Features | Select-Object -ExpandProperty Definition | Where-Object {[string]::IsNullOrEmpty($Identity) -or ($_.DisplayName -eq $Identity)} |
                                     % {Add-Member -InputObject $_ -MemberType noteproperty -Name Url -Value $web.Url -PassThru} |
                                     Select-Object -Property Scope, DisplayName, Id, Url)

                    $web.Dispose()
                }
                $site.Dispose()
            }
        }
    }
    End
    {
        $results
    }
} #end Get-SPFeatureActivated

Get-SPFeatureActivated

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