! use xev to find a keycode
! ~: shift O umlaut (keycode 19)
! \ and |: left bottom corner key: Idash

!
! Swap Caps_Lock and Control_L
!
remove Lock = Caps_Lock
remove Control = Control_L
keysym Control_L = Caps_Lock
keysym Caps_Lock = Control_L
add Lock = Caps_Lock
add Control = Control_L

!
! xmodmap -e 'keycode 65 = space underscore space' 
!

keycode 65 = space underscore space
!keycode 21 = asciicircum backslash asciicircum
!keycode 21 = backslash backslash asciicircum

keycode 94 = backslash bar backslash
keycode 49 = bar bar backslash