What is the short cut in eclipse to terminate debugging/running?

As said here, you can add/enable the Debug command group to any perspective using
Window / Customize Perspective > Commands.
(Select the 'Debug' group)

Then open the Debug view in the Java perspective (as a Fast view perhaps) and you should get your Terminate keybinding.

I suppose it was not working because you tried it in a non-debug session.

I also ran into this issue, but still didn't find a proper solution.

Apparently, because multiple user program instances can run together, they (eclipse devs) just didn't put a general terminate key.

As I just saw in their bugs section, they're (maybe) working on showing a dialog for selecting which running program you want to terminate when you click on the terminate button (probably will be Ctrl+F2 as default).

You can see the bug page for this issue for further details and updates. hope it helps anyone.

A lot of the above answers work for some people but maybe not everyone. As Scott Biggs mentioned, command-F2 may not work on macs (note that to get F2 on a mac, you also need to hold down the fn key), so you can reset the binding to shift-F2. Worked for me, as long as you are debugging.