I have been wanting a quick an easy way to execute the “Secure Empty Trash” that is part of the Trash functionality of OS X. There doesn’t seem to be way of setting it to the default, so instead I have opted for a set of keystrokes. There are plenty of options out there, but instead of shift-command-backspace (which is used by the standard “Empty Trash”) I wanted to use shift-command-delete. Go to the Terminal application, execute the following command and the relaunch the Finder application via the “Force Quit…” menu item:
defaults write com.apple.finder NSUserKeyEquivalents '{"Secure Empty Trash" = "$@\177";}'