Add group in Linux / Unix environment

Recently I learn about database and about to practice. But then realize I need to add on some new group for my database in linux / unix environment.

This is the syntax to add group:
groupadd [-g gid [-o]] [-r] [-f] group

Example:
groupadd dba

If you would like to know more about "groupadd" command, type "man groupadd" (omit the double quote). Following is what you will get:
-----------------------------
GROUPADD(8)               System Management Commands               GROUPADD(8)

NAME
       groupadd - create a new group

SYNOPSIS
       groupadd [options] group

DESCRIPTION
       The groupadd command creates a new group account using the values
       specified on the command line plus the default values from the system.
       The new group will be entered into the system files as needed.

--truncated. You will get full detail when you type "man groupadd".