Shutting Down Windows from Ruby Code

Someone recently asked how to shut down or restart Windows from their Ruby code. Windows provides an executable, "shutdown.exe", to accomplish this. Execute this command from your script with the appropriate parameters and you can log off, shutdown, or restart the OS.

Parameters accepted include, but are not limited to:

-l        Log off (cannot be used with -m option)
-s        Shutdown the computer
-r        Shutdown and restart the computer
-t xx     Set timeout for shutdown to xx seconds
-f        Forces running applications to close without warning

So, the following line of code will close all applications without a warning and instantly shut down and restart your PC:

system('shutdown.exe -r -f -t 0')

To get the full list of parameters, open a console window and enter

shutdown.exe /?

Further details can be found in this Microsoft article. And Gordon Thiesfeld offers WMI and win32ole alternatives in this Ruby Forum thread.

Thanks for stopping by!

Win32OLE Library for JRuby?

Charles O. Nutter of the JRuby project is seeking proposals for Google's Summer of Code (GSoC).

Among the suggested projects is this one of possible interest to many [J]Ruby on Windows users:

Win32OLE Library for JRuby - Implement the win32ole library for JRuby. This would also be an excellent contribution, since there's already libraries like Jacob to take some of the pain out of it, and it would be great to have it working on JRuby. (suggested by sgwong)

Update from Charlie:

BTW, if you know anyone that might be interested in doing this through GSoC, please spread the word quickly. The deadline for submissions is Monday, April 7, so there's not a lot of time left.

And to make it more attractive, there's already a very nice Java library that provides COM/OLE support (http://danadler.com/jacob/) so the task is more about wiring that library into JRuby than mucking about with any low-level native nasties.

I'd love to see this project undertaken, as it could be a big boost for those of us who currently do COM automation work with Ruby. I haven't done much with JRuby yet (a wee bit of Jython in the past), but I like the possibilities for having an easily-distributable app (JAR file?) that includes a GUI (e.g., Swing) and Win32OLE functionality.

What do you think? Would a Win32OLE library increase the likelihood of you using JRuby for some future projects?