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Installing Microsoft Updates via PowerShell
Posted in Virtual Machine Manager, Windows Powershell, Windows Server | No Comment | 1,941 views | 19/06/2014 02:26

You can install Microsoft Updates on your server by using following PowerShell script.

This script doesn’t reboot your server after Microsoft Update, even if patch requires reboot.
Instead, it gives you True/False result as an output, so you can reboot server by checking Update results.
So you can use this script to create your own Cluster Aware Update procedure.

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Function Install-MicrosoftUpdate {
 
<#
    .SYNOPSIS
 
        Function to install Microsoft Updates on Windows Servers.
 
    .DESCRIPTION
 
        If you have large number of Windows Servers, Microsoft Updates may not be an easy job.
		This script could start Microsoft Update installation on remote servers by using PowerShell.
 
    .PARAMETER  WhatIf
 
        Display what would happen if you would run the function with given parameters.
 
    .PARAMETER  Confirm
 
        Prompts for confirmation for each operation. Allow user to specify Yes/No to all option to stop prompting.
 
    .EXAMPLE
 
        Install-MicrosoftUpdate
 
    .EXAMPLE
 
        Install-MicrosoftUpdate -ComputerName Server01
 
    .EXAMPLE
 
        Install-MicrosoftUpdate -ComputerName Server01 -SuppressMode
 
    .INPUTS
 
        None
 
    .OUTPUTS
 
        None
 
    .NOTES
 
        Author: Yusuf Ozturk
        Website: http://www.yusufozturk.info
        Email: ysfozy@gmail.com
        Date created: 19-June-2014
        Last modified: 22-June-2014
        Version: 1.2
 
    .LINK
 
        http://www.yusufozturk.info
        http://twitter.com/yusufozturk
 
#>
 
	[CmdletBinding(SupportsShouldProcess = $true)]
	param (
 
		# ComputerName
		[Parameter(
			Mandatory = $false,
			HelpMessage = 'Computer Name')]
		$ComputerName = "localhost",
 
		# Suppress Mode
		[Parameter(
			Mandatory = $false,
			HelpMessage = 'Suppress Mode')]
		[switch]$SuppressMode = $false,		
 
		# Debug Mode
		[Parameter(
			Mandatory = $false,
			HelpMessage = 'Debug Mode')]
		[switch]$DebugMode = $false
	)
 
	# Enable Debug Mode
	if ($DebugMode)
	{
		# Set Error Action Preference
		$ErrorActionPreference = "Stop"
 
		# Set Debug Preference
		$DebugPreference = "Continue"
	}
	else
	{
		# Set Error Action Preference
		$ErrorActionPreference = "silentlycontinue"
	}
 
	if ($ComputerName -ne "localhost")
	{
		if (!$SuppressMode)
		{
			# Informational Output
			Write-Host "Starting remote patching on $ComputerName.." -ForegroundColor Cyan
			Write-Host "Please wait.." -ForegroundColor Gray
			Write-Host " "
		}
 
		# Invoke Script on Remote Computer
		$InvokeCommand = Invoke-Command -ComputerName $ComputerName -ArgumentList $SuppressMode, $DebugMode -ScriptBlock {
 
			# Define Parameters
			param ($SuppressMode, $DebugMode)
 
			# Set Execution Policy
			$SetExecutionPolicy = Set-ExecutionPolicy Unrestricted -Force -Confirm:$False
 
			# Default Reboot Status
			$RebootStatus = "False"
 
			# Create Microsoft Update Session
			$UpdateSession = New-Object -ComObject "Microsoft.Update.Session"
 
			# Search Microsoft Updates
			$UpdateSearcher = $UpdateSession.CreateUpdateSearcher()
			$SearchResult = $UpdateSearcher.Search("IsInstalled=0 and IsHidden=0")
 
			# Create Microsoft Update Install Queue
			$InstallQueue = New-Object -ComObject "Microsoft.Update.UpdateColl"
 
			for ($i = 0; $i -lt $SearchResult.Updates.Count; $i++) 
			{
				# Get Current Microsoft Update
				$Update = $SearchResult.Updates.Item($i)
 
				# Get Microsoft Update Description
				$UpdateDescription = $Update.Title
 
				# Microsoft Update KB Pattern
				$KBPattern = "KB\d{1,20}"
 
				# Search for Microsoft Update KB
				$RegexSearch = $UpdateDescription -match $KBPattern
 
				# Get Microsoft Update KB
				$UpdateKB = $Null;
				$UpdateKB = $Matches[0]
 
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "-------------------------------------------------"
					Write-Host " "
					Write-Host "Working on $UpdateKB.." -ForegroundColor Cyan
					Write-Host "Description: $UpdateDescription" -ForegroundColor Gray
					Write-Host " "
				}
 
				# Skip User Input
				if ($Update.InstallationBehavior.CanRequestUserInput) { Continue }
 
				# Accept Eula
				if ($Update.EulaAccepted -eq $False) { $Update.AcceptEula() }
 
				# Get Microsoft Update Status
				if ($Update.IsDownloaded) 
				{
					# Add to Install Queue
					$InstallQueue.Add($Update) | Out-Null
 
					# Reboot Behaviour
					if ($Update.InstallationBehavior.RebootBehavior -gt 0) 
					{ 
						# Set Reboot Status
						$RebootRequired = $True
 
						if (!$SuppressMode)
						{
							# Informational Output
							Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
							Write-Host "Warning: $UpdateKB requires reboot." -ForegroundColor Yellow
							Write-Host " "
							Write-Host " "
						}
					}
					else
					{
						if (!$SuppressMode)
						{
							# Informational Output
							Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
							Write-Host " "
							Write-Host " "
						}
					}
				}
				else
				{
					# Add to Install Queue
					$InstallQueue.Add($Update) | Out-Null
 
					if (!$SuppressMode)
					{
						# Informational Output
						Write-Host "Warning: $UpdateKB is not downloaded on server yet." -ForegroundColor Yellow
						Write-Host " "
						Write-Host " "
					}
 
					# Reboot Behaviour
					if ($Update.InstallationBehavior.RebootBehavior -gt 0) 
					{ 
						# Set Reboot Status
						$RebootRequired = $True
 
						if (!$SuppressMode)
						{
							# Informational Output
							Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
							Write-Host "Warning: $UpdateKB requires reboot." -ForegroundColor Yellow
							Write-Host " "
							Write-Host " "
						}
					}
					else
					{
						if (!$SuppressMode)
						{
							# Informational Output
							Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
							Write-Host " "
							Write-Host " "
						}
					}				
				}	
			}
 
			if ($InstallQueue.Count -eq 0) 
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Warning: There are no Microsoft Updates available" -ForegroundColor Yellow
				}
			}
			else
			{
				$MicrosoftUpdateScript = @'
Function Install-MicrosoftUpdate
{
	# Default Reboot Behaviour
	$RebootRequired = $False
 
	# Create Microsoft Update Session
	$UpdateSession = New-Object -ComObject "Microsoft.Update.Session"
 
	# Search Microsoft Updates
	$UpdateSearcher = $UpdateSession.CreateUpdateSearcher()
	$SearchResult = $UpdateSearcher.Search("IsInstalled=0 and IsHidden=0")
 
	# Create Microsoft Update Install Queue
	$InstallQueue = New-Object -ComObject "Microsoft.Update.UpdateColl"
 
	for ($i = 0; $i -lt $SearchResult.Updates.Count; $i++) 
	{
		# Get Current Microsoft Update
		$Update = $SearchResult.Updates.Item($i)
 
		# Get Microsoft Update Description
		$UpdateDescription = $Update.Title
 
		# Microsoft Update KB Pattern
		$KBPattern = "KB\d{1,20}"
 
		# Search for Microsoft Update KB
		$RegexSearch = $UpdateDescription -match $KBPattern
 
		# Get Microsoft Update KB
		$UpdateKB = $Null;
		$UpdateKB = $Matches[0]
 
		if (!$SuppressMode)
		{
			# Informational Output
			Write-Host "-------------------------------------------------"
			Write-Host " "
			Write-Host "Working on $UpdateKB.." -ForegroundColor Cyan
			Write-Host "Description: $UpdateDescription" -ForegroundColor Gray
			Write-Host " "
		}
 
		# Skip User Input
		if ($Update.InstallationBehavior.CanRequestUserInput) { Continue }
 
		# Accept Eula
		if ($Update.EulaAccepted -eq $False) { $Update.AcceptEula() }
 
		# Get Microsoft Update Status
		if ($Update.IsDownloaded) 
		{
			# Add to Install Queue
			$InstallQueue.Add($Update) | Out-Null
 
			# Reboot Behaviour
			if ($Update.InstallationBehavior.RebootBehavior -gt 0) 
			{ 
				# Set Reboot Status
				$RebootRequired = $True
 
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
					Write-Host "Warning: $UpdateKB requires reboot." -ForegroundColor Yellow
					Write-Host " "
					Write-Host " "
				}
			}
			else
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
					Write-Host " "
					Write-Host " "
				}
			}
		}
		else
		{
			# Add to Install Queue
			$InstallQueue.Add($Update) | Out-Null
 
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Warning: $UpdateKB is not downloaded on server yet." -ForegroundColor Yellow
				Write-Host " "
				Write-Host " "
			}
 
			# Reboot Behaviour
			if ($Update.InstallationBehavior.RebootBehavior -gt 0) 
			{ 
				# Set Reboot Status
				$RebootRequired = $True
 
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
					Write-Host "Warning: $UpdateKB requires reboot." -ForegroundColor Yellow
					Write-Host " "
					Write-Host " "
				}
			}
			else
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
					Write-Host " "
					Write-Host " "
				}
			}				
		}	
	}
 
	if ($InstallQueue.Count -eq 0) 
	{
		if (!$SuppressMode)
		{
			# Informational Output
			Write-Host "Warning: There are no Microsoft Updates available." -ForegroundColor Yellow
		}
	}
	else
	{
		# Download Microsoft Updates
		$Downloader = $UpdateSession.CreateUpdateDownloader()
		$Downloader.Updates = $InstallQueue
		$DownloadResults = $Downloader.Download()
 
		# Install Microsoft Updates
		$UpdateInstaller = $UpdateSession.CreateUpdateInstaller()
		$UpdateInstaller.Updates = $InstallQueue
		$Results = $UpdateInstaller.Install()
		$ResultCode = $Results.ResultCode
 
		if ($ResultCode -eq "0")
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Result: Microsoft Update is not started yet." -ForegroundColor Yellow
			}
 
			# Set Reboot Status
			$RebootStatus =	"False"
		}
		elseif ($ResultCode -eq "1")
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Result: Another installation is in progress." -ForegroundColor Yellow
			}
 
			# Set Reboot Status
			$RebootStatus =	"False"
		}
		elseif ($ResultCode -eq "2")
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Result: Update installation is succeeded." -ForegroundColor Green
			}
 
			# Set Reboot Status
			if ($RebootRequired -eq $True) { $RebootStatus = "True" } else { $RebootStatus = "False" }
		}
		elseif ($ResultCode -eq "3")
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Result: Update installation is succeeded with errors." -ForegroundColor Yellow
			}
 
			# Set Reboot Status
			if ($RebootRequired -eq $True) { $RebootStatus = "True" } else { $RebootStatus = "False" }				
		}
		elseif ($ResultCode -eq "4")
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Result: Update installation is failed." -ForegroundColor Red
			}
 
			# Set Reboot Status
			$RebootStatus =	"False"
		}
		elseif ($ResultCode -eq "5")
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Result: Update installation is aborted." -ForegroundColor Red
			}
 
			# Set Reboot Status
			$RebootStatus =	"False"
		}
		else
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Result: Unknown Error" -ForegroundColor Red
			}
 
			# Set Reboot Status
			$RebootStatus = "False"
		}
 
		# Get Date Information
		$Date = (Get-Date).ToUniversalTime()
		$DateUTC = Get-Date($Date) -Format 'yyyy-MM-dd HH:mm:ss'
 
		# Microsoft Update Results
		$LastSuccessTime = $DateUTC
		$LastError = $Results.HResult
 
		# Get Registry Path of Microsoft Update Results
		$RegPath = "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\Results\Install"
 
		if (Test-Path -Path $RegPath) 
		{
			# Get Registry Key
			$RegKey = Get-ItemProperty -Path $RegPath
 
			# Set Results to Registry
			if($RegKey -match 'LastError') { Set-ItemProperty -Path $RegPath -Name 'LastError' -Value $LastError }
			if($RegKey -match 'LastSuccessTime') { Set-ItemProperty -Path $RegPath -Name 'LastSuccessTime' -Value $LastSuccessTime }
		}
	}
 
	# Reboot Status Output
	$RebootStatusOutput = Set-Content -Value $RebootStatus -Path "C:\Program Files\ClusterAwareUpdating\RebootStatusOutput.txt"
	$RebootStatus
}
 
	# Install Microsoft Updates
	Install-MicrosoftUpdate
'@
				# Get Cluster Aware Update Path
				$ClusterAwareUpdatePath = "C:\Program Files\ClusterAwareUpdating"
 
				# Get Microsoft Update Path
				$MicrosoftUpdatePath = "C:\Program Files\ClusterAwareUpdating\MicrosoftUpdate.ps1"
 
				# Test Cluster Aware Update Path
				$TestClusterAwareUpdate = Test-Path -Path $ClusterAwareUpdatePath
 
				if ($TestClusterAwareUpdate)
				{
					# Set Microsoft Update Script
					Set-Content -Value $MicrosoftUpdateScript -Path $MicrosoftUpdatePath | Out-Null
				}
				else
				{
					# Create Cluster Aware Update Folder
					New-Item -Name ClusterAwareUpdating -Path "C:\Program Files" -Type Directory | Out-Null
 
					# Set Microsoft Update Script
					Set-Content -Value $MicrosoftUpdateScript -Path $MicrosoftUpdatePath | Out-Null
				}
 
				# Get Scheduled Task
				$ScheduledTask = Get-ScheduledTask | Where {$_.TaskName -eq "VirtualMetric-ClusterAwareUpdating"}
 
				# Get Scheduled Task Name
				$ScheduledTaskName = $ScheduledTask.TaskName
 
				# Get Scheduled Task Path
				$ScheduledTaskPath = $ScheduledTask.TaskPath
 
				if ($ScheduledTaskName -ne "VirtualMetric-ClusterAwareUpdating")
				{
					# Register Scheduled Job
					$RegisterJob = Register-ScheduledJob -FilePath $MicrosoftUpdatePath -Name "VirtualMetric-ClusterAwareUpdating"
 
					# Set Elevated Access
					$SetElevatedAccess = Get-ScheduledJob -Name "VirtualMetric-ClusterAwareUpdating" | Get-ScheduledJobOption | Set-ScheduledJobOption -RunElevated
 
					# Get Scheduled Task
					$ScheduledTask = Get-ScheduledTask -TaskName "VirtualMetric-ClusterAwareUpdating"
 
					# Get Scheduled Task Name
					$ScheduledTaskName = $ScheduledTask.Name
 
					# Get Scheduled Task Path
					$ScheduledTaskPath = $ScheduledTask.TaskPath
				}
 
				# Start Scheduled Job
				$StartScheduledJob = Start-ScheduledTask -TaskName "VirtualMetric-ClusterAwareUpdating" -TaskPath $ScheduledTaskPath | Out-Null
 
				# Set Scheduled Job Status
				$JobStatus = "Running"
 
				# Wait Until Scheduled Job Finished
				while ($JobStatus -eq "Running")
				{
					# Clear Job Status
					$JobStatus = "Ready"
 
					# Get Scheduled Job Status
					$JobStatus = (Get-ScheduledTask | Where {$_.TaskName -eq "VirtualMetric-ClusterAwareUpdating"}).State
 
					# Wait Until Next Check
					if ($JobStatus -eq "Running") { Start-Sleep -s 60 }
				}
 
				# Test Reboot Status Output
				$TestRebootStatusOutput = Test-Path -Path "C:\Program Files\ClusterAwareUpdating\RebootStatusOutput.txt"
 
				if ($TestRebootStatusOutput)
				{
					# Get Reboot Status
					$RebootStatus = Get-Content -Path "C:\Program Files\ClusterAwareUpdating\RebootStatusOutput.txt"
				}
				else
				{
					if (!$SuppressMode)
					{
						# Informational Output
						Write-Host "Error: Please check last result code of task scheduler" -ForegroundColor Red
					}
 
					# Set Reboot Status
					$RebootStatus = "False"
				}
			}
 
			# Output Reboot Status
			$RebootStatus
		}
 
		if ($SuppressMode)
		{
			# Output Reboot Status
			$InvokeCommand
		}
	}
	else
	{
		# Default Reboot Behaviour
		$RebootRequired = $False
 
		# Create Microsoft Update Session
		$UpdateSession = New-Object -ComObject "Microsoft.Update.Session"
 
		# Search Microsoft Updates
		$UpdateSearcher = $UpdateSession.CreateUpdateSearcher()
		$SearchResult = $UpdateSearcher.Search("IsInstalled=0 and IsHidden=0")
 
		# Create Microsoft Update Install Queue
		$InstallQueue = New-Object -ComObject "Microsoft.Update.UpdateColl"
 
		for ($i = 0; $i -lt $SearchResult.Updates.Count; $i++) 
		{
			# Get Current Microsoft Update
			$Update = $SearchResult.Updates.Item($i)
 
			# Get Microsoft Update Description
			$UpdateDescription = $Update.Title
 
			# Microsoft Update KB Pattern
			$KBPattern = "KB\d{1,20}"
 
			# Search for Microsoft Update KB
			$RegexSearch = $UpdateDescription -match $KBPattern
 
			# Get Microsoft Update KB
			$UpdateKB = $Null;
			$UpdateKB = $Matches[0]
 
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "-------------------------------------------------"
				Write-Host " "			
				Write-Host "Working on $UpdateKB.." -ForegroundColor Cyan
				Write-Host "Description: $UpdateDescription" -ForegroundColor Gray
				Write-Host " "
			}
 
			# Skip User Input
			if ($Update.InstallationBehavior.CanRequestUserInput) { Continue }
 
			# Accept Eula
			if ($Update.EulaAccepted -eq $False) { $Update.AcceptEula() }
 
			# Get Microsoft Update Status
			if ($Update.IsDownloaded) 
			{
				# Add to Install Queue
				$InstallQueue.Add($Update) | Out-Null
 
				# Reboot Behaviour
				if ($Update.InstallationBehavior.RebootBehavior -gt 0) 
				{ 
					# Set Reboot Status
					$RebootRequired = $True
 
					if (!$SuppressMode)
					{
						# Informational Output
						Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
						Write-Host "Warning: $UpdateKB requires reboot." -ForegroundColor Yellow
						Write-Host " "
						Write-Host " "
					}
				}
				else
				{
					if (!$SuppressMode)
					{
						# Informational Output
						Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
						Write-Host " "
						Write-Host " "
					}
				}
			}
			else
			{
				# Add to Install Queue
				$InstallQueue.Add($Update) | Out-Null
 
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Warning: $UpdateKB is not downloaded on server yet." -ForegroundColor Yellow
					Write-Host " "
					Write-Host " "
				}
 
				# Reboot Behaviour
				if ($Update.InstallationBehavior.RebootBehavior -gt 0) 
				{ 
					# Set Reboot Status
					$RebootRequired = $True
 
					if (!$SuppressMode)
					{
						# Informational Output
						Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
						Write-Host "Warning: $UpdateKB requires reboot." -ForegroundColor Yellow
						Write-Host " "
						Write-Host " "
					}
				}
				else
				{
					if (!$SuppressMode)
					{
						# Informational Output
						Write-Host "Adding $UpdateKB to Update Queue.." -ForegroundColor Green
						Write-Host " "
						Write-Host " "
					}
				}				
			}	
		}
 
		if ($InstallQueue.Count -eq 0) 
		{
			if (!$SuppressMode)
			{
				# Informational Output
				Write-Host "Warning: There are no Microsoft Updates available." -ForegroundColor Yellow
			}
		}
		else
		{
			# Download Microsoft Updates
			$Downloader = $UpdateSession.CreateUpdateDownloader()
			$Downloader.Updates = $InstallQueue
			$DownloadResults = $Downloader.Download()
 
			# Install Microsoft Updates
			$UpdateInstaller = $UpdateSession.CreateUpdateInstaller()
			$UpdateInstaller.Updates = $InstallQueue
			$Results = $UpdateInstaller.Install()
			$ResultCode = $Results.ResultCode
 
			if ($ResultCode -eq "0")
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Result: Microsoft Update is not started yet." -ForegroundColor Yellow
				}
 
				# Set Reboot Status
				$RebootStatus =	"False"
			}
			elseif ($ResultCode -eq "1")
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Result: Another installation is in progress." -ForegroundColor Yellow
				}
 
				# Set Reboot Status
				$RebootStatus =	"False"
			}
			elseif ($ResultCode -eq "2")
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Result: Update installation is succeeded." -ForegroundColor Green
				}
 
				# Set Reboot Status
				if ($RebootRequired -eq $True) { $RebootStatus = "True" } else { $RebootStatus = "False" }
			}
			elseif ($ResultCode -eq "3")
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Result: Update installation is succeeded with errors." -ForegroundColor Yellow
				}
 
				# Set Reboot Status
				if ($RebootRequired -eq $True) { $RebootStatus = "True" } else { $RebootStatus = "False" }				
			}
			elseif ($ResultCode -eq "4")
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Result: Update installation is failed." -ForegroundColor Red
				}
 
				# Set Reboot Status
				$RebootStatus =	"False"
			}
			elseif ($ResultCode -eq "5")
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Result: Update installation is aborted." -ForegroundColor Red
				}
 
				# Set Reboot Status
				$RebootStatus =	"False"
			}
			else
			{
				if (!$SuppressMode)
				{
					# Informational Output
					Write-Host "Result: Unknown Error" -ForegroundColor Red
				}
 
				# Set Reboot Status
				$RebootStatus = "False"
			}
 
			# Get Date Information
			$Date = (Get-Date).ToUniversalTime()
			$DateUTC = Get-Date($Date) -Format 'yyyy-MM-dd HH:mm:ss'
 
			# Microsoft Update Results
			$LastSuccessTime = $DateUTC
			$LastError = $Results.HResult
 
			# Get Registry Path of Microsoft Update Results
			$RegPath = "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\Results\Install"
 
			if (Test-Path -Path $RegPath) 
			{
				# Get Registry Key
				$RegKey = Get-ItemProperty -Path $RegPath
 
				# Set Results to Registry
				if($RegKey -match 'LastError') { Set-ItemProperty -Path $RegPath -Name 'LastError' -Value $LastError }
				if($RegKey -match 'LastSuccessTime') { Set-ItemProperty -Path $RegPath -Name 'LastSuccessTime' -Value $LastSuccessTime }
			}
		}
 
		if ($SuppressMode)
		{
			# Output Reboot Status
			$RebootStatus
		}
	}
}

So if you just type:

Install-MicrosoftUpdate

that will install Microsoft Updates on your local server.
If you want to install Microsoft Updates on remote server, then type like:

Install-MicrosoftUpdate -ComputerName "MyHyperVHost01"

If you use this function in a script, then you can suppress write-host outputs:

Install-MicrosoftUpdate -ComputerName "MyHyperVHost01" -SuppressMode

That will give you Reboot Status as a result.



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