groupadd —
add a group to the system
  
    | groupadd | [ -ov] [-ggid] [-rlowgid..highgid]
      group | 
The groupadd utility adds a group to the system. See
  group(8) for more information
  about EXTENSIONS. The options are as follows:
  - -ggid
- Give the numeric group identifier to be used for the new group.
- -o
- Allow the new group to have a gid which is already in use for another
      group.
- -rlowgid- ..highgid
- Set the low and high bounds of a gid range for new groups. A new group can
      only be created if there are gids which can be assigned inside the range.
      This option is included if built with
    EXTENSIONS.
- -v
- Enable verbose mode - explain the commands as they are executed. This
      option is included if built with EXTENSIONS.
Thegroupadd utility exits 0 on success,
  and >0 if an error occurs.
The groupadd utility first appeared in
  NetBSD 1.5. It is based on the
  addnerd package by the same author.
The groupadd utility was written by
  Alistair G. Crooks ⟨agc@NetBSD.org⟩.