To cite package ‘command’ in publications use:

  Bryant J (2026). _command: Process Command Line Arguments_. R package
  version 0.1.4, <https://github.com/bayesiandemography/command>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {command: Process Command Line Arguments},
    author = {John Bryant},
    year = {2026},
    note = {R package version 0.1.4},
    url = {https://github.com/bayesiandemography/command},
  }