Powershell Script to Find Unregistered Features on the SharePoint Farm

$LogTime = Get-Date -Format yyyy-MM-dd_hh-mm
$LogFile = ".\UnregisteredFeaturesPatch-$LogTime.rtf"

# Add SharePoint PowerShell Snapin


if ( (Get-PSSnapin -Name Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue) -eq $null ) {
    Add-PSSnapin Microsoft.SharePoint.Powershell
}

$scriptBase = split-path $SCRIPT:MyInvocation.MyCommand.Path -parent
Set-Location $scriptBase


#Deleting any .rtf files in the scriptbase location
$FindRTFFile = Get-ChildItem $scriptBase\*.* -include *.rtf
if($FindRTFFile)
{
  foreach($file in $FindRTFFile)
  {
   remove-item $file
  }
}


start-transcript $logfile

try {
   Write-Verbose "Getting unregistered features ..."
   $unregistered = Install-SPFeature -ScanForFeatures
   Write-Output $unregistered
}
catch [Exception] {
   Write-Error $Error[0]
   $err = $_.Exception
   while ( $err.InnerException ) {
      $err = $err.InnerException
      Write-Output $err.Message
   }
}