#!/usr/bin/perl
use strict;
use warnings;

use Data::Hexdumper qw( hexdump );

die "Usage: hexdebug FILE FILE_POS BYTES_TO_DUMP"
    unless @ARGV == 3;

open( my $fh, '<', $ARGV[0] )
    or die "Couldn't open file '$ARGV[0]': $!";

seek $fh, $ARGV[1], 0;

my $content;
read( $fh, $content, $ARGV[2] );

print hexdump(
    data           => $content,
    space_as_space => 1,
);