1. Open up "Notepad" by going to Start > Run > "Notepad" and then click OK.
2. In the notepad editor, type in:
c:\windows\system32\shutdown -s -f -t 0
3. Save the file to your computer. You can put it pretty much anywhere on your computer. I put mine on my C: drive.
What
this batch file does is it points to the shutdown function on your
computer, generally located at c:\windows\system32\shutdown. You may
want to double check this, as some computers may have it listed as
c:\winnt\system32\shutdown. If this is the case, then you want to change
your batch file accordingly. The -s tells it to shutdown the computer.
The -f tells it to force the computer to shutdown so that it doesn't get
hung on any open applications. The -t sets the time for it to wait
before it actually shuts down. You can set it to whatever you want, but I
put in 0 to set it to zero.
ref: http://www.instructables.com/id/Remotely-Shut-Down-Your-Computer-With-A-Cell-Phone/step3/Create-the-shutdownbat-file/