WSUS

All command line options for the wuauclt:

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

Windows update service can be started from command line(CMD) using the below command.

net start wuauserv

It can be stopped from windows command line(CMD) using the below net stop command.

net stop wuauserv

To restart the wsus server you can run:

net stop WSUSService

and

net start WSUSService

SNMP on windows

To modify the traps or the access to the SNMP 
you can open the services console, and find SNMP 
services in case the Security tap it's lock you can modify 
the information on the registries:

HKLM\SOFTWARE\Policies\SNMP\Parameters\ValidCommunities
HKLM\SOFTWARE\Policies\SNMP\Parameters\PermittedManagers

To add a host on the accept snmp packets, 
create a new string key on the ValidCommunities 
regestry, after this restart the service, 
and everything will start working.