How to control KDE (4.9.0) plasma widgets from command line?

Question

I cannot delete "Window Menubar" widget from panel and "Facebook" widget from "Search and Launch" desktop bottom. And I don't want to delete all my settings, can I delete these widgets somewhere in config files or with some commands?

Answer 1

The settings are stored in ~/.kde/share/config/plasma-desktop-appletsrc.

1. Edit it.
2. Don't change anything from GUI to prevent rewriting the file.
3. Log out.
4. Log in.