xmodmap

From Noah.org

Move keys around the keyboard

#!/bin/sh

# set up keyboard to exchange the Shift and Up keys, and the Down and Right keys
#xmodmap -e "clear Shift"
#xmodmap -e "keycode 62 = Up Prior"
#xset r 62                          # repeat Up key
#xmodmap -e "keycode 102 = Down Next"
#xmodmap -e "add Shift = Shift_R"
#xmodmap -e "add Shift = Shift_L"

xmodmap -e "keycode 114 = Down"     # => Down
xmodmap -e "keycode 62 = Up"        # => Up
xmodmap -e "keycode 111 = Shift_R"  # => Shift
xmodmap -e "keycode 116 = Right"    # => Right
xmodmap -e "add shift = Shift_R"    # Make the new Shift key actually shift
xset r 114                          # repeat Down key
xset r 62                           # repeat Up key
xset -r 111                         # don't repeat new Shift key