Convert Hex to Bin in bash

hex2bin

#!/bin/bash

if [ ! -n $1 ]; then
  echo "Must specify a value"
  exit 1
fi

for var in "$@"
do
  code=`echo $var | tr 'a-z' 'A-Z'`
  converted=`echo "ibase=16; $code" | bc`
  echo -n "$converted "
done

echo