#!/bin/bash
val=`xmodmap -pke | grep "keycode 91 = KP_Delete KP_Decimal"`
echo $val
  if [ -n "$val" ]
  then
    xmodmap -e 'keycode 91 = KP_Delete comma'
  else
    xmodmap -e 'keycode 91 = KP_Delete KP_Decimal'
  fi