Enhancing Man Pages with Practical Examples: A Step-by-Step Guide for Contributors

Overview

Man pages are a cornerstone of Unix-like systems documentation, but they often fall short in providing clear, actionable examples. This guide walks you through the process of adding or improving example sections in man pages, using the dig and tcpdump utilities as real-world case studies. You'll learn how to identify gaps, collaborate with maintainers, write beginner-friendly examples, and navigate the roff formatting language. By the end, you'll have a repeatable workflow to make any man page more useful for novice and infrequent users.

Enhancing Man Pages with Practical Examples: A Step-by-Step Guide for Contributors

Prerequisites

Basic familiarity with the command-line tool you're documenting (e.g., used a few times).
A GitHub or equivalent account to submit patches.
A text editor (e.g., Vim, VSCode).
Optional: pandoc or a custom Markdown-to-roff converter for easier formatting.

Step-by-Step Instructions

1. Identify Tools with Example Gaps

Start by browsing the man pages of tools you use regularly. Look for sections that lack examples entirely or have outdated/confusing ones. The original dig and tcpdump man pages had either no examples or incomplete ones that didn't cover basic use cases like querying a DNS record or capturing a few packets.

2. Research Common User Questions

Visit forums like Stack Overflow, Reddit, or the tool's issue tracker. For example, common tcpdump questions include: "How do I capture HTTP traffic?" or "How to save packets to a file?". For dig, beginners often ask: "How do I do a simple A record lookup?" or "What flags enable verbose output?". List the top 5–10 questions and design examples that answer them.

3. Consult with Maintainers

Reach out to the project's maintainers (via mailing list or IRC). The authors of the original improvements note that maintainers often know hidden gems, like tcpdump -v -w out.pcap printing a live packet count. This step ensures your examples are accurate and include power-user tips. Be ready to discuss which examples are most needed; maintainers may have a roadmap.

4. Write the Examples Section

For each tool, write a clear example: list the command, explain what it does, and show sample output. Keep language simple—assume the reader has never seen the command before. For instance:

dig example.com A

This performs a standard DNS lookup for the IPv4 address of example.com. The A flag specifies record type. Compare written examples before and after: avoid jargon like "query the resolver" and instead say "look up the IP address."

5. Handle Man Page Formatting (roff)

Most man pages are written in roff, a markup language that can be daunting. The original authors used a custom Markdown-to-roff script to avoid learning it from scratch. You can do the same: write examples in simple Markdown, then convert using a script like md2roff.pl or pandoc with a compatible template. Ensure the output follows the existing style (e.g., .EX / .EE for code blocks).

6. Get Feedback and Iterate

Submit a draft to the maintainers or a public review list (e.g., tcpdump-workers@). Expect feedback on phrasing, accuracy, and formatting. The original improvements went through several rounds, catching issues like missing flags or ambiguous wording. Revise until everyone is satisfied.

7. Submit Patch

Create a git commit with clear message (e.g., "Add examples section to dig.1") and open a pull request. Include a summary of what the examples cover and why they matter. You may need to sign a contributor agreement for some projects.

Common Mistakes

Overcomplicating examples: Beginners need the simplest case first. Avoid combining multiple flags in a single example unless it's clearly explained.
Ignoring man page conventions: Each project has its own style (e.g., line length 72, no tabs). Use man to check existing formatting and mimic it.
Not testing the rendered output: Before submitting, run nroff -man yourfile.1 | less to see how it looks. A misaligned table can ruin readability.
Skipping maintainer consultation: You might miss important context (e.g., deprecated flags) that could invalidate an example.
Writing without a use-case focus: Instead of listing every flag, write examples that solve a real problem (e.g., 'capture DNS query traffic' rather than 'tcpdump -i eth0 port 53').

Summary

Improving man pages with practical examples is a high-impact way to contribute to open-source tools. By following the steps outlined—identifying gaps, researching user needs, consulting maintainers, writing clear examples, dealing with roff formatting, and iterating based on feedback—you can turn a dry reference into a learning resource. The dig and tcpdump examples serve as proof that even small additions can make a tool significantly more approachable. Start with your favorite command today!

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