.Xmodmap

! escape = caps_lock; caps_lock = control_l; control_l = escape
!keycode 37 = Control_L
!keycode 66 = Caps_Lock
!keycode 9 = Escape

!remove Lock = Caps_Lock
!add Lock = Escape
!remove Control = Control_L
!add Control = Caps_Lock

!keycode 9 = Caps_Lock
!keycode 66 = Control_L
!keycode 37 = Escape

! -------------------------------

! Swap caps lock and escape
remove Lock = Caps_Lock
keysym Escape = Caps_Lock
keysym Caps_Lock = Escape
add Lock = Caps_Lock