Mac keyboard shortcut to rm file [duplicate]

Possible Duplicate:
Permanently deleting files on Mac OS

What's the Mac keyboard shortcut to rm a file? I know command + delete sends it to trash, but I want to permanently delete it, say with command + fn + delete.

UPDATE: It doesn't look like there is one. So, I want to create a service with Automator and then assign a keyboard shortcut to it from System Preferences.

I can get to Automator -> Service -> Service receives selected files or folders in Finder.app, but how do I write the script that then runs rm -rf #{file/folder name}?

To answer your edit requesting Automator help:

Use the Run Shell Script action, Pass input as arguments and the following script:

for f in "$@"
do
    rm -rf "$f"
done

You can assign a keyboard shortcut via Application Menu, Services, Services Preferences. It's a bit difficult to assign backspace/"delete" to a keyboard shortcut (see comments on this answer) though.

You can alternatively create an application in Automator, and add a reference to the Finder toolbar (applications can be dragged there).

Assigning a keyboard shortcut using delete (backspace) or forward delete:

1. Define a simple keyboard shortcut for the service without delete (e.g. Cmd-Ctrl-Opt-G) using System Preferences. Quit System Preferences.
2. Open ~/Library/Preferences/pbs.plist using Property List Editor and copy the key for the service. It's within NSServicesStatus and looks something like (null) - Service Name - runWorkflowAsService. Quit Property List Editor.

3. Open Terminal and enter the following command (use the line you copied earlier between the quotes and double-quotes):

   defaults write pbs NSServicesStatus -dict-add '"(null) - Service Name - runWorkflowAsService"' '{ "key_equivalent" = "@\U0008"; }'

4. Open Application Menu » Services » Service Preferences, and toggle your service.

5. Enjoy your new key combination.

In the command line, @ is Cmd, ^ is Ctrl, $ is Shift, and ~ is Option. Mix and match these modifiers to your preferences. \U0008 is delete (backspace), \U007F is forward delete.

See this MacGeekery post.