Look at the data at different offsets of a file

ripper.sh

#!/bin/sh
#
# Rip files from the specified file using dd and file
#
# Copyright (C) 2017 Wincent Balin

# Check for supplied filename
if [ -z "$1" ]
then
  echo Usage: ripper.sh file_to_rip
  exit 1
fi

# Rip the file
SIZE=`stat -L -c '%s' "$1"`
for i in `seq 0 $SIZE`
do
  TYPE=`dd if="$1" skip=$i bs=1M iflag=skip_bytes | file -b -`
  if [ "$TYPE" != "data" ]
  then
    echo At $i: $TYPE
  fi
done