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use 5.010;
use strict;
use warnings;
...
open my $debug, '>>', 'debug.txt' or confess "Couldn't open file: $!";
printf $debug "%s.\n", $var;
close $debug;

$> hexdump -C debug.txt
00000000  51 65 54 45 76 32 38 30  34 2e 0a                 |QeTEv2804
+..|
0000000b