Use this script to check if a remote machine has any new windows update available
<#
.SYNOPSIS
This script will list all available windows updates
.PARAMETER URL
User the Computer parameter to specify the Computer to remotely list windows updates .
#>
function install-OSUpdate {
[CmdletBinding()]
param (
[parameter(Mandatory=$true,Position=1)]
[string[]]$computer
)
ForEach ($c in $computer){
#install pswindows updates module on remote machine
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$nugetinstall = invoke-command -ComputerName $c -ScriptBlock {Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force}
invoke-command -ComputerName $c -ScriptBlock {
[Net.ServicePointManager]::SecurityProtocol += [Net.SecurityProtocolType]::Tls12
install-module pswindowsupdate -force
}
invoke-command -ComputerName $c -ScriptBlock {Import-Module PSWindowsUpdate -force}
Do{
#Reset Timeouts
$connectiontimeout = 0
$updatetimeout = 0
#starts up a remote powershell session to the computer
do{
$session = New-PSSession -ComputerName $c
"reconnecting remotely to $c"
sleep -seconds 10
$connectiontimeout++
} until ($session.state -match "Opened" -or $connectiontimeout -ge 10)
#retrieves a list of available updates
"Checking for new updates available on $c"
$updates = invoke-command -session $session -scriptblock {Get-wulist -MicrosoftUpdate -verbose}
#counts how many updates are available
$updatenumber = ($updates.kb).count
write-host "$updatenumber updates available"
#if there are available updates proceed with installing the updates and then reboot the remote machine
}until($updates)
"Windows is now up to date on $c"
}
}