Here's a couple of tweaks...

#!/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;
   }
[download]

Outputs:

00000000  6f 6e 65 0a 74 77 6f 0a  74 68 72 65 65 20 91 92  |one.two.t
+hree ..|
00000010  20 66 6f 75 72 0a 66 69  76 65 0a 6f 6e 65 0a 74  | four.fiv
+e.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.t
+hree ..|
00000010  20 66 6f 75 72 0a 66 69  76 65 0a 6f 6e 65 0a 74  | four.fiv
+e.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
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.