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    my $res = GetOptions(
        'si!'           => \$Opts{si},
        'version|v'     => sub {
            no warnings;
            print "linespeed version $main::VERSION ($main::DATE)\n";
            exit 0;
        },
        'help|h'        => sub {
            print <<USAGE;
Usage:
  linespeed [OPTIONS]... < INPUT
  linespeed --version, -v
  linespeed --help, -h
Options:
For more details, see the manpage/documentation.
USAGE
            exit 0;
        },
    );
    exit 99 if !$res;
}