How do I shut down Windows from the command line without Shutdown?

Open a Command Prompt or PowerShell window and use the built-in Windows shutdown command:

• shutdown /s /t 0 -- Shut down immediately
• shutdown /r /t 0 -- Restart immediately
• shutdown /l -- Log off the current user
• shutdown /s /f /t 0 -- Force shut down immediately, closing all applications

The /t 0 parameter sets the timeout to zero seconds so the action happens right away.