| argument | Argument | 
| as_atomic_type | Convert x to type | 
| atomic | R Atomic Data type | 
| build_help_page | Help page | 
| build_option_text | Build option text | 
| choice | Choice | 
| command | Command | 
| get_arguments | Get all argument params | 
| get_defaults | Get default values of params | 
| get_nargs | Get all nargs value from arguments | 
| get_options | Get all option params | 
| interval | Interval | 
| is_integer | Check if numeric value is an integer | 
| is_long_opt | Check if string is valid long option name | 
| is_short_opt | Check if string is valid short option name | 
| is_valid_choice_value | Check validity of choice value | 
| is_valid_interval_value | Check validity of interval value | 
| is_valid_name | Check if string is valid variable name | 
| match_positionals_with_arguments | Match the positional args given with those defined in... | 
| merge_lists | Helper function to merge lists (left to right) | 
| option | Option | 
| parse_args | Parse command-line arguments using standard libc functions | 
| parse_parameter_type | Parse parameter type | 
| pipe | Pipe | 
| prepare_getopt_param | Translate a single parameter element to the format required... | 
| process_getopt_values | Convert strings returned by getopt into appropriate R types | 
| remove_opt_prefix | Simple function to remove option prefix | 
| script | Script | 
| scriptr | scriptr - parse command line arguments from the shell | 
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