Commands:
  check      Checks for security vulnerabilities and against PEP 508 markers
             provided in Pipfile.
  clean      Uninstalls all packages not specified in Pipfile.lock.
  graph      Displays currently-installed dependency graph information.
  install    Installs provided packages and adds them to Pipfile, or (if none
             is given), installs all packages.
  lock       Generates Pipfile.lock.
  open       View a given module in your editor.
  run        Spawns a command installed into the virtualenv.
  shell      Spawns a shell within the virtualenv.
  sync       Installs all packages specified in Pipfile.lock.
  uninstall  Un-installs a provided package and removes it from Pipfile.
  update     Runs lock, then sync.

$ pipenv check --help
Usage: pipenv check [OPTIONS] [ARGS]...

  Checks for security vulnerabilities and against PEP 508 markers provided
  in Pipfile.

Options:
  --three / --two     Use Python 3/2 when creating virtualenv.
  --python TEXT       Specify which version of Python virtualenv should use.
  --system            Use system Python.
  --unused TEXT       Given a code path, show potentially unused dependencies.
  -i, --ignore TEXT   Ignore specified vulnerability during safety checks.
  --pypi-mirror TEXT  Specify a PyPI mirror.
  -h, --help          Show this message and exit.