Although it’s not essential, there is a command line command that will search and start Windows Update on Windows PC.
wuauclt
Some documented switches for this command are listed here:
From a dump of the .exe (W2k3 R2 version ) we can extract the following options:
/DetectNow
/ReportNow
/RunHandlerComServer
/RunStoreAsComServer
/ShowSettingsDialog
/ResetAuthorization
/ResetEulas
/ShowWU
/ShowWindowsUpdate
/SelfUpdateManaged
/SelfUpdateUnmanaged
/UpdateNow
/ShowWUAutoScan
/ShowFeaturedUpdates
/ShowOptions
/ShowFeaturedOptInDialog
/DemoUI
More information can be found here.
if you searching for more options for managing windows updates via command line, you should have a look on wuinstall.com. i used it to manage several workstations with batch scripts. it worked quite well, you even can cache windows updates in your local network with that tool.