Install all available windows updates on a computer. This requires PsExec to be installed locally (not on the remote computer.)

InstallWindowsUpdates.ps1

function Install-WindowsUpdates($computerName) {
    $command = {
        if (! (Test-Path c:\updates )) { New-Item c:\updates -ItemType Directory  }
        if (Test-Path c:\updates\installUpdates.ps1 ) {  Remove-Item c:\updates\installUpdates.ps1 -Force -Confirm:$false }
        "Get-WUInstall -AcceptAll -AutoReboot -Verbose " | Out-File c:\updates\installUpdates.ps1
    }
    Invoke-Command -ComputerName $computerName -ScriptBlock $command
    ##WSUS doesn't like remote execution... so we have to jump through several hoops to make it think it's executing locally....
    if (Test-Path \\$computerName\c$\updates\prepareForReboot.ps1 ) {
        ## Prepare for reboot is an optional script you can install on the remote server to gracefully shutdown things before reboot.
        Write-Host "Running prepareForReboot.ps1"
        .\PsExec.exe \\$($computerName) -s powershell -File c:\updates\prepareForReboot.ps1
    }
    .\PsExec.exe \\$($computerName) -s powershell -File c:\updates\installUpdates.ps1
}