the webmaster adds that many of the things done with this command require that you be logged on as root which is the UNIX super user id or any other super user id on your unix system 
Maintenance Commands                                 groupdel(1M)



NAME
     groupdel - delete a group definition from the system

SYNOPSIS
     /usr/sbin/groupdel group

DESCRIPTION
     The groupdel  utility deletes a group  definition  from  the
     system. It deletes the appropriate entry from the /etc/group
     file.

OPERANDS
     group     An existing group name to be deleted.

EXIT STATUS
     The following exit values are returned:

     0         Success.

     2         Invalid command syntax. A usage  message  for  the
               groupdel  command is displayed.

     6         group does not exist.

     10        Cannot update the /etc/group file.

FILES
     /etc/group
               system file containing group definitions

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:
     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWcsu                     |
    |_____________________________|_____________________________|

SEE ALSO
     users(1B),    groupadd(1M),    groupmod(1M),     logins(1M),
     useradd(1M), userdel(1M), usermod(1M), attributes(5)

NOTES
     The groupdel  utility only deletes a group  definition  that
     is  in  the  local /etc/group file. If a network nameservice
     such as NIS or NIS+ is being used to  supplement  the  local
     /etc/group  file  with  additional entries, groupdel  cannot
     change information supplied by the network nameservice.
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