#! /bin/bash

function a2h() {
  i=0
  echo -n "0x"
  while [ $i -lt ${#1} ];
  do
    echo -en "${1:$i:1}" | od -t x1 | head -1 | awk '{printf("%2.2s",$2)}' 
    let "i += 1"
  done
  echo 0A
  echo
}

a2h "$1"