#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11166492
use warnings;
use Path::Tiny;
use feature 'signatures';

my $file = path('../tmp.tmp'); # FIXME for testing
system "hexdump -C $file; echo";
print hexdump( $file->slurp );

sub hexdump($data) {
   $data =~ s/\G(?|
       ( \0{16} )+ (?{ '*' })
     | ( .{1,16} ) (?{
            sprintf '%08X  %-50s|%s|', $-[1],
              "@{[unpack '(H2)8a0(H2)8', $1]}",
              $1 =~ y{ -~}{.}cr
       })
   )/$^R\n/xsgr . sprintf "%08x\n", length $data;
   }

##</code><code>##

00000000  6f 6e 65 0a 74 77 6f 0a  74 68 72 65 65 20 91 92  |one.two.three ..|
00000010  20 66 6f 75 72 0a 66 69  76 65 0a 6f 6e 65 0a 74  | four.five.one.t|
00000020  77 6f 0a 74 68 72 65 65  20 2c 2c 20 66 6f 75 72  |wo.three ,, four|
00000030  0a 66 69 76 65 0a                                 |.five.|
00000036

00000000  6f 6e 65 0a 74 77 6f 0a  74 68 72 65 65 20 91 92  |one.two.three ..|
00000010  20 66 6f 75 72 0a 66 69  76 65 0a 6f 6e 65 0a 74  | four.five.one.t|
00000020  77 6f 0a 74 68 72 65 65  20 2c 2c 20 66 6f 75 72  |wo.three ,, four|
00000030  0a 66 69 76 65 0a                                 |.five.|
00000036