```console $ 03_01_flag_bool --help A simple to use, efficient, and full-featured Command Line Argument Parser Usage: 03_01_flag_bool[EXE] [OPTIONS] Options: -v, --verbose -h, --help Print help information -V, --version Print version information $ 03_01_flag_bool verbose: false $ 03_01_flag_bool --verbose verbose: true $ 03_01_flag_bool --verbose --verbose verbose: true ```