GROUPADD linux command manual

GROUPADD(8)                                                    GROUPADD(8)

       groupadd - Create a new group

       groupadd [-g gid [-o]] [-r] [-f] group

       The  groupadd  command  creates  a  new group account using the values
       specified on the command line and the default values from the  system.
       The  new  group  will be entered into the system files as needed.  The
       options which apply to the groupadd command are

       -g gid The numerical value of the group's  ID.   This  value  must  be
              unique,  unless  the -o option is used.  The value must be non-
              negative.  The default is to use the smallest ID value  greater
              than  500 and greater than every other group.  Values between 0
              and 499 are typically reserved for system accounts.

       -r     This flag instructs groupadd to  add  a  system  account.   The
              first  available  gid  lower  than  499  will  be automatically
              selected unless the -g option is  also  given  on  the  command
              This is an option added by Red Hat.

       -f     This  is  the force flag. This will cause groupadd to exit with
              an error when the group about to be added already exists on the
              system.  If  that  is  the case, the group won't be altered (or
              added again).
              This option also modifies the way -g  option  works.  When  you
              request  a  gid that it is not unique and you don't specify the
              -o option too, the group creation will fall back to  the  stan-
              dard  behavior  (adding  a group as if neither -g or -o options
              were specified).
              This is an option added by Red Hat.

       /etc/group - group account information
       /etc/gshadow - secure group account information

       chfn(1), chsh(1),  passwd(1),  groupdel(8),  groupmod(8),  useradd(8),
       userdel(8), usermod(8)

       Julianne Frances Haugh (