怎样通过批处理来关机，重启和登出

How do I shut down, restart or log off Windows via a bat file?

The most common ways to use the shutdown command are:

• shutdown -s — Shuts down.
• shutdown -r — Restarts.
• shutdown -l — Logs off.
• shutdown -h — Hibernates.

Note: There is a common pitfall wherein users think -h means "help" (which it does for every other command-line program... except shutdown.exe,
where it means "hibernate"). They then run shutdown -h and accidentally turn off their computers. Watch out for that.

• shutdown -i — "Interactive mode". Instead of performing an action, it displays a GUI dialog.
• shutdown -a — Aborts a previous shutdown command.

The commands above can be combined with these additional options:

• -f — Forces programs to exit. Prevents the shutdown process from getting stuck.
• -t — Sets the time until shutdown. Use -t 0 to shutdown immediately.
• -c — Adds a shutdown message. The message will end up in the Event Log.
• -y — Forces a "yes" answer to all shutdown queries.

I want to make sure some other really good answers are also mentioned along with this one. Here they are in no particular order.

• The -f option from JosephStyons
• Using rundll32 from VonC
• The Run box from Dean
• Remote shutdown from Kip

source: https://stackoverflow.com/questions/162304/how-do-i-shutdown-restart-or-log-off-windows-via-a-bat-file