To cite package ‘getopt’ in publications use:

Davis T, Day A (2026). getopt: C-Like 'getopt' Behavior. R package version 1.21.1, https://github.com/trevorld/r-getopt.

Corresponding BibTeX entry:

  @Manual{,
    title = {getopt: C-Like 'getopt' Behavior},
    author = {Trevor L. Davis and Allen Day},
    year = {2026},
    note = {R package version 1.21.1},
    url = {https://github.com/trevorld/r-getopt},
  }