groupinfo —
displays group information
The groupinfo utility retrieves the group information
  from the system. The groupinfo utility is only
  available if built with EXTENSIONS. See
  group(8) for more information.
The following command line options are recognised:
  - -e
- Return 0 if the group exists, and non-zero if the group does not exist, on
      the system. No information is displayed. This form of the command is
      useful for scripts which need to check whether a particular group name or
      gid is already in use on the system.
- -v
- Perform any actions in a verbose manner.
The group argument may either be a group's
    name, or a gid.
The groupinfo utility exits 0 on success,
  and >0 if an error occurs.
The groupinfo utility first appeared in
  NetBSD 1.5. It is based on the
  addnerd package by the same author.
The groupinfo utility was written by
  Alistair G. Crooks ⟨agc@NetBSD.org⟩.