To cite package ‘cmdfun’ in publications use:

  Nystrom S (2024). _cmdfun: Framework for Building Interfaces to Shell
  Commands_. R package version 1.0.2, ,
  <https://github.com/snystrom/cmdfun>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {cmdfun: Framework for Building Interfaces to Shell Commands},
    author = {Spencer Nystrom},
    year = {2024},
    note = {R package version 1.0.2, 
},
    url = {https://github.com/snystrom/cmdfun},
  }