Trying to access positional arguments with sample program bellow: If I run: "a.out one" Error: unknown option positional Same error I got on "a.out -h one" and "a.out one -h" If I run: "a.out one two" Error: too many positional options But "a.out -h works" Thanks \/. namespace po=boost::program_options; po::options_description cmds("Options"); cmds.add_options() ("help,h", "output help message"); po::positional_options_description positional; positional.add("positional", 1); po::variables_map vm; po::parsed_options parsed = po::command_line_parser(argc, argv).options(cmds).positional(positional).run(); po::store( parsed, vm); po::notify(vm); if (vm.count("help")) { cout << cmds << endl; return 0; } if(vm.count("positional") ) { cout << "positional"; } } catch(const std::exception& ex) { cout << "Error: " << ex.what() << endl; } =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ===============================================================================