Global Vim-like Arrow Mapping configuration using xmodmap on Ubuntu

.Xmodmap

! ref: https://wiki.archlinux.org/title/Xmodmap
! exec: xmodmap ~/.Xmodmap
! Set Keyboard::Dispatch to 'keyCode' in VSCode, otherwise capslock remapping does't work
! ref: https://github.com/microsoft/vscode/issues/23991
! auto startup with system:
! add following command to 'Startup Applications Preferences' app on Ubuntu
! /bin/bash -c 'xmodmap /home/xueshi/.Xmodmap'

clear lock
! Map Caplock key to Mode_switch key, we use it as 'Hyper' key later
! Shift+Capslock = CapsLock
keycode 66 = Mode_switch Caps_Lock NoSymbol NoSymbol


! four symbols sequceces meanings:  Key |  Shift+Key | Mode_switch+Key | Mode_switch+Shift+Key
! Mode_switch + h = Left
keycode  43 = h H Left H
keycode  44 = j J Down J
keycode  45 = k K Up K
keycode  46 = l L Right L

! Backspace
keycode  31 = i I BackSpace I

! page up / down
keycode  30 = u U Prior U
keycode  40 = d D Next D

keycode  38 = a A Home A
keycode  26 = e E End E