National keyboard layouts, relocating control keys, etc., generally at the operating system level. See /keyboard-shortcuts for key mappings in applications.
Use this tag for questions about national keyboard layouts, relocating control keys, etc., generally at the operating system level. For issues with the keyboard itself, see keyboard. For key mappings in an application, or to map a key to an operating system function, see keyboard-shortcuts.
Under the X Window System, the basic tools to handle keyboard layouts are xmodmap (old-school) and xkb (modern).