Tips & Tricks: Enable Standby in Windows 2008 R2 Server
Shutdown: %windir%\System32\shutdown.exe –s
Reboot: %windir%\System32\shutdown.exe –r
Logoff: %windir%\System32\shutdown.exe –l
Standby: %windir%\System32\rundll32.exe powrprof.dll,SetSuspendState Standby
Hibernate: %windir%\System32\rundll32.exe powrprof.dll,SetSuspendState Hibernate