Install Sort::External from CPAN. It was written for the purpose of sorting huge files.
my $sortex = Sort::External->new();
while (<HUGEFILE>) {
$sortex->feed($_);
}
$sortex->finish;
my $prev = '';
while ( defined( $_ = $sortex->fetch ) ) {
next if $_ eq $prev;
print OUTFILE $_;
$prev = $_;
}
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