Customize Keyboard on Ubuntu (UNIX)

customize_keyboard.sh

#!/bin/bash

KEYCODE="keycode"

xmodmap -e "${KEYCODE}  83 = Left"     # KP_4
xmodmap -e "${KEYCODE}  80 = Up"       # KP_8
xmodmap -e "${KEYCODE}  85 = Right"    # KP_6
xmodmap -e "${KEYCODE}  84 = Down"     # KP_5
xmodmap -e "${KEYCODE}  88 = Down"     # KP_2

xmodmap -e "${KEYCODE}  90 = Delete"   # Insert
xmodmap -e "${KEYCODE}  77 = Delete"   # Num_Lock
xmodmap -e "${KEYCODE}  81 = "         # PgUp
xmodmap -e "${KEYCODE}  89 = "         # PgDn

xmodmap -e "${KEYCODE}  63 = "         # KP_Multiply
xmodmap -e "${KEYCODE}  82 = "         # KP_Subtract
xmodmap -e "${KEYCODE}  86 = "         # KP_Add
xmodmap -e "${KEYCODE} 106 = "         # KP_Divide
xmodmap -e "${KEYCODE} 129 = "         # KP_Decimal
xmodmap -e "${KEYCODE} 125 = "         # KP_Equal
xmodmap -e "${KEYCODE} 104 = KP_Enter" # KP_Enter

CONFIG_FILE="/home/${USER}/.Xmodmap"
INIT_CONFIG_FILE="/home/${USER}/.xinitrc"

xmodmap -pke > "${CONFIG_FILE}"
touch "${INIT_CONFIG_FILE}"
printf "xmodmap .Xmodmap" > "${INIT_CONFIG_FILE}"