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Referring to this article published September 8, 2011, it gives instructions on how to to do a full (non-hybrid) shutdown in Windows 8 from the command line.

We have an option in the UI to revert back to the Windows 7 shutdown/cold boot behavior, or since that’s likely a fairly infrequent thing, you can use the new /full switch on shutdown.exe. From a cmd prompt, run: shutdown /s /full / t 0 to invoke an immediate full shutdown.

shutdown /s /full /t 0

I tried this in W8 Enterprise RTM trial, but did not work, so I did a

shutdown /?

and noticed they have changed the command for a Full shutdown

It appears the /s switch now does the full shutdown as explained in the MS article, and the /hybrid switch does the hybrid shutdown for fast startup.

Can anyone confirm this change in other RTM versions of Windows 8?

Any Microsoft docs on this change are welcome.

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From the help:

/hybrid    Performs a shutdown of the computer and prepares it for fast startup.
           Must be used with /s option.

Looks like you have to specify both options if you want the hybrid shutdown.

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Just tried this on my Surface (WinRT), shutdown /s /full does nothing where as shutdown /s /hybrid completes the shutdown. – edusysadmin Nov 15 '12 at 17:26

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