# pdfs.log in this case is the result of doing something like: find /a/directory/somewhere -name "*.pdf" > pdfs.log

for file in $(cat pdfs.log) ; do
  if [ ! -h $file ] ; then
    echo "Checking for duplicates of: $file"
    file_basename=$(basename "$file")
    for duplicate in $(cat pdfs.log) ; do
      if [ ! -h $duplicate ] ; then
        if [ "$duplicate" != "$file" ] ; then
          if [ "$(basename $duplicate)" = "$file_basename" ] ; then
            cmp -s $duplicate $file
            if [ $? -eq 0 ] ; then
              echo "ln -sf $file $duplicate"
              ln -sf $file $duplicate
            fi
          fi
        fi
      fi
    done
  fi
done