远程使用Gpupdate（Hash，哈希）

function Start-GPUpdate
{
    param
    (
        [String[]]
        $ComputerName
    )

    $code = {
        $rv = 1 | Select-Object -Property ComputerName, ExitCode
        $null = gpupdate.exe /force
        $rv .Exitcode =  $LASTEXITCODE
        $rv .ComputerName =  $env:COMPUTERNAME
        $rv
    }
    Invoke-Command -ScriptBlock $code -ComputerName $ComputerName |
      Select-Object -Property ComputerName, ExitCode

}

From： http://www.pstips.net/gpupdate-on-remote-machines.html