wsus-update

wsus-update.ps1

Function WSUSUpdate {
	$LogFile = "UpdateLogs\" + (Get-Date -format yyyy-MM-dd--HH-mm) + ".log"
	Start-transcript $LogFile
	$Criteria = "IsInstalled=0 and Type='Software'"
	$Searcher = New-Object -ComObject Microsoft.Update.Searcher
	try {
		$SearchResult = $Searcher.Search($Criteria)
		[Object[]] $Critical = $SearchResult.updates | where { $_.MsrcSeverity -eq "Critical" }
		[Object[]] $Important = $SearchResult.updates | where { $_.MsrcSeverity -eq "Important" }
		[Object[]] $Moderate = $SearchResult.updates | where { $_.MsrcSeverity -eq "Moderate" }
		[Object[]] $Low = $SearchResult.updates | where { $_.MsrcSeverity -eq "Low" }
		[Object[]] $Unspecified = $SearchResult.updates | where { $_.MsrcSeverity -eq "Unspecified" }
		[Object[]] $Other = $SearchResult.updates | where { $_.MsrcSeverity -eq $null }
		
		#Write Results
		"Critical    : $($Critical.count)"
		"Important   : $($Important.count)"
		"Moderate    : $($Moderate.count)"
		"Low         : $($Low.count)"
		"Unspecified : $($Unspecified.count)"
		"Other       : $($Other.count)"  
		"Total       : $($SearchResult.updates.count)"
		""
		"Notes:  ""BrowseOnly"" updates are considered optional."
		"         Microsoft anti-virus updates include sub-updates"
		"         that are already installed, so size is inaccurate."
		# "If" statement in Expression:  http://blogs.technet.com/b/josebda/archive/2014/04/19/powershell-tips-for-building-objects-with-custom-properties-and-special-formatting.aspx
		# Formatting number as MB:  https://technet.microsoft.com/en-us/library/ff730948.aspx

		$UpdatesToInstall = $Critical + $Important + $Moderate + $Low
		
		if ($UpdatesToInstall.Count -eq 0) {
			Write-Output "There are no applicable updates."
			exit
		} 
		else {
			$Session = New-Object -ComObject Microsoft.Update.Session
			$Downloader = $Session.CreateUpdateDownloader()
			$Downloader.Updates = $UpdatesToInstall
			$Downloader.Download()
			$Installer = New-Object -ComObject Microsoft.Update.Installer
			$Installer.Updates = $UpdatesToInstall
			$Result = $Installer.Install()
		}
	}
	catch {
		Write-Output "There are no applicable updates."
	}
	finally {
		Stop-transcript
	}
}

WSUSUpdate
If ($Result.rebootRequired) { Restart-Computer }