#!/bin/bash

write_pkginfo() {
     local IFS=$'\n'
     local size="$(find . -type f -links 1 -exec cat {} + 2>/dev/null | wc -c)"
     inum='0'
     for i in $(find . -type f -links +1 -printf '%i %p\n'|sort); do n=${i% *}
	  fname=${i#* }
	  [ "$inum" != "$n" ] && {
	       z=$(cat "$fname"|wc -c)
	       (( size += z ))
	  }
	  inum=$n
     done
     echo $size
}
write_pkginfo