update.PS1

Function Add-WindowsUpdate
{param ($Criteria="IsInstalled=0 and Type='Software'" , [switch]$AutoRestart, [Switch]$ShutdownAfterUpdate)
 $resultcode= @{0="Not Started"; 1="In Progress"; 2="Succeeded"; 3="Succeeded With Errors"; 4="Failed" ; 5="Aborted" }
 $updateSession = new-object -com "Microsoft.Update.Session"
 write-progress -Activity "Updating" -Status "Checking available updates"  
 $updates=$updateSession.CreateupdateSearcher().Search($criteria).Updates
 if ($Updates.Count -eq 0)  { "There are no applicable updates."}   
 else {
       $downloader = $updateSession.CreateUpdateDownloader()   
       $downloader.Updates = $Updates  
        write-progress -Activity 'Updating' -Status "Downloading $($downloader.Updates.count) updates" 
       $Result= $downloader.Download()  
       if (($Result.Hresult -eq 0) -and (($result.resultCode -eq 2) -or ($result.resultCode -eq 3)) ) {
       $updatesToInstall = New-object -com "Microsoft.Update.UpdateColl"
       $Updates | where {$_.isdownloaded} | foreach-Object {$updatesToInstall.Add($_) | out-null }
       $installer = $updateSession.CreateUpdateInstaller()
       $installer.Updates = $updatesToInstall
       write-progress -Activity 'Updating' -Status "Installing $($Installer.Updates.count) updates"
        $installationResult = $installer.Install()
        $Global:counter=-1
        $installer.updates | Format-Table -autosize -property Title,EulaAccepted,@{label='Result';
                               expression={$ResultCode[$installationResult.GetUpdateResult($Global:Counter++).resultCode ] }} 
       if ($autoRestart -and $installationResult.rebootRequired) { shutdown.exe /t 0 /r }
       if ($ShutdownAfterUpdate) {shutdown.exe /t 0 /s }  
} 
}
}
Add-WindowsUpdate -Auto