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shutdown.exe

Shutdown and annotation tool.

Shutdown the computer

/t 0 specifies the time in seconds (/t 0 = immediately).

/s means the computer.

C:\> shutdown /s /t 0

The command might be augmented with /f to force all applications to be closed.

The /h option allows to hibernate a computer from the command line (cmd.exe or PowerShell):

C:\> shutdown /h

Use /r rather than /s:

C:\> shutdown /r /t 0

With /l (ell), the current user can log him/herself out:

C:\> shutdown /L