$ papers --help
usage: papers [-h] ...
subcommands: add, list, edit, remove, rename, fetch, undo, redo, install ...

$ papers add --help
usage: papers add [options] PDF
  --bibtex FILE    BibTeX file to update
  --filesdir DIR   directory to store PDFs
  --rename         rename PDF based on metadata
  --copy           copy (not move) the PDF