Coreutils/thanks-gen

#!/usr/bin/perl -nl
# Use Perl's multi-byte alignment code, via sprintf, while
# performing a rudimentary check for duplicate names and
# removing duplicate name,email pairs.
use Encode;

BEGIN { my (%seen, %name) }

chomp;
my ($name, $email) = split '\0', decode ('UTF-8', $_);

$seen{$name}++
  and warn "$0: THANKS.in: duplicate name: $name\n";

print encode ('UTF-8', sprintf ('%-36s', $name)), $email
  unless $seen{"$name\0$email"}++;