xkbcomp
compiles XKB keyboard descriptions. setxkbmap ch
setxkbmap us
setxkbmap us -option 'caps:swapescape'
(Compare with /usr/share/X11/xkb/symbols/capslock) $ xkbcomp -xkb $DISPLAY exported-configuration-file
evdev
mean/refer to? localectl list-x11-keymap-layouts
localectl list-x11-keymap-models
localectl set-x11-keymap [layout] [model] [variant] [options]