#!/bin/bash
exec 3</var/lib/dpkg/status
while read -u 3 item value junk; do
 if [ "$item" = "Package:" ]; then
  declare package=$value
 elif [ "$item" = "Installed-Size:" ]; then
  if [ "$package" ]; then
   echo $value $package
  fi
 else
  echo cannot recognize: $item $value $junk >&2
 fi
done