Automatic Client Upgrade

Update-CMClient.ps1

$code = 'Your Three digit site code'

while ($true){ 
   $c= Get-CMCollection -Name 'Clients with < SCCM Version 1511' | select -expand MemberCount;
   $d = Get-CMCollection -Name 'Clients with > SCCM Version 1511' | select -expand MemberCount;
   $x = get-random -maximum 10 -minimum 1
   "trying another $x clients"
   $r = get-cmdevice -CollectionName 'Clients with < SCCM Version 1511' |   get-random -count $x
   $r |  %{
      Install-CMClient -DeviceName $_.Name -SiteCode $code -ForceReinstall $true -AlwaysInstallClient $True -IncludeDomainController $False
    }
 "Less than 1511 `t:$c"
 "More than 1511 `t:$d"
 timeout 180
 }