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            die "summ: Invalid percentile $p, must be between 0 and 100\n"
                if $p < 0 || $p > 100;
            push @{ $Opts{calc_percentiles} }, $p
                unless grep { $p == $_ } @{ $Opts{calc_percentiles} };
        },
        'covariance!'  => \$Opts{calc_covariance},
        'correlation!' => \$Opts{calc_correlation},
        'help|h' => sub {
            print <<USAGE;
Usage:
  summ [OPTIONS]... [INPUT]...
  summ --help

For more details, see the manpage/documentation.
USAGE
            exit 0;
        },
        'version|v' => sub {
            no warnings 'once';
            print "summ version ".($main::VERSION // 'dev'), "\n";
            exit 0;