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use strict;
use warnings;
...

   print("$hex   $chr\n");
}

>perl hexdump.pl < hexdump.pl
75 73 65 20  73 74 72 69  63 74 3B 0D  0A 75 73 65    use.strict;..use
...
0D 0A 20 20  20 70 72 69  6E 74 28 22  24 68 65 78    .....print("$hex
20 20 20 24  63 68 72 5C  6E 22 29 3B  0D 0A 7D 0D    ...$chr\n");..}.
0A                                                    .