Keywords: command-line | help text | standard format | best practices
Abstract: This article explores the standard formats and best practices for command-line help text, based on common industry conventions and supplementary resources. It begins with the importance of help text, then details syntax conventions such as the use of brackets and angle brackets, summarizes best practices for option lists and triggers, and mentions formal standards like docopt.
Introduction
Command-line interfaces are widely used in modern software, and clear help text is crucial for user experience. This article delves into the format standards of help text, aiming to provide practical guidance for developers.
Standard Format and Syntax Conventions
Although there is no unified official standard, industry-wide conventions have emerged. A well-structured help output should include the following elements:
- A brief description of the application's functionality.
- Usage syntax, where:
- Use
[options]to indicate where options can be placed. - Required arguments are denoted by
arg_name, recommended in lower snake case. - Optional arguments are indicated with
[arg_name]. - For multiple arguments, use
arg_name...for required and[arg_name...]for optional.
- Use
- A formatted list of options, each should:
- Provide a short description.
- Display default values, if applicable.
- List possible values, when relevant.
- Short forms (e.g.,
-h) and long forms (e.g.,--help) should be shown together.
- Indication of configuration files or environment variables (e.g.,
GREP_OPTS) as sources of arguments. - Reference to man pages or other detailed help resources.
Best practices include using both -h and --help to trigger the help message and displaying it automatically upon syntax errors.
Supplementary Standards and Resources
Beyond informal conventions, formal standards like docopt offer a structured approach to documenting and parsing command-line arguments. For example, docopt uses specific syntax to define usage patterns.
Major platforms such as Microsoft and IBM have published syntax guidelines, often using <value> as argument placeholders and brackets for optional elements.
Best Practices Summary
To ensure clarity and usability, it is recommended to maintain format consistency, use descriptive argument names, and seamlessly integrate help triggers. Adhering to existing conventions can enhance user familiarity and reduce the learning curve.