NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CONFIGURATION | FILES | CAVEATS | EXIT VALUES | SEE ALSO | COLOPHON

GROUPADD(8)              System Management Commands              GROUPADD(8)

NAME         top

       groupadd - create a new group

SYNOPSIS         top

       groupadd [options] group

DESCRIPTION         top

       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.

OPTIONS         top

       The options which apply to the groupadd command are:

       -f, --force
           This option causes the command to simply exit with success status
           if the specified group already exists. When used with -g, and the
           specified GID already exists, another (unique) GID is chosen
           (i.e.  -g is turned off).

       -g, --gid 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 or equal to
           GID_MIN and greater than every other group.

           See also the -r option and the GID_MAX description.

       -h, --help
           Display help message and exit.

       -K, --key KEY=VALUE
           Overrides /etc/login.defs defaults (GID_MIN, GID_MAX and others).
           Multiple -K options can be specified.

           Example: -K GID_MIN=100  -K GID_MAX=499

           Note: -K GID_MIN=10,GID_MAX=499 doesn't work yet.

       -o, --non-unique
           This option permits to add a group with a non-unique GID.

       -p, --password PASSWORD
           The encrypted password, as returned by crypt(3). The default is
           to disable the password.

           Note: This option is not recommended because the password (or
           encrypted password) will be visible by users listing the
           processes.

           You should make sure the password respects the system's password
           policy.

       -r, --system
           Create a system group.

           The numeric identifiers of new system groups are chosen in the
           SYS_GID_MIN-SYS_GID_MAX range, defined in login.defs, instead of
           GID_MIN-GID_MAX.

       -R, --root CHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the
           configuration files from the CHROOT_DIR directory.

CONFIGURATION         top

       The following configuration variables in /etc/login.defs change the
       behavior of this tool:

       GID_MAX (number), GID_MIN (number)
           Range of group IDs used for the creation of regular groups by
           useradd, groupadd, or newusers.

           The default value for GID_MIN (resp.  GID_MAX) is 1000 (resp.
           60000).

       MAX_MEMBERS_PER_GROUP (number)
           Maximum members per group entry. When the maximum is reached, a
           new group entry (line) is started in /etc/group (with the same
           name, same password, and same GID).

           The default value is 0, meaning that there are no limits in the
           number of members in a group.

           This feature (split group) permits to limit the length of lines
           in the group file. This is useful to make sure that lines for NIS
           groups are not larger than 1024 characters.

           If you need to enforce such limit, you can use 25.

           Note: split groups may not be supported by all tools (even in the
           Shadow toolsuite). You should not use this variable unless you
           really need it.

       SYS_GID_MAX (number), SYS_GID_MIN (number)
           Range of group IDs used for the creation of system groups by
           useradd, groupadd, or newusers.

           The default value for SYS_GID_MIN (resp.  SYS_GID_MAX) is 101
           (resp.  GID_MIN-1).

FILES         top

       /etc/group
           Group account information.

       /etc/gshadow
           Secure group account information.

       /etc/login.defs
           Shadow password suite configuration.

CAVEATS         top

       Groupnames must start with a lower case letter or an underscore,
       followed by lower case letters, digits, underscores, or dashes. They
       can end with a dollar sign. In regular expression terms:
       [a-z_][a-z0-9_-]*[$]?

       Groupnames may only be up to 16 characters long.

       You may not add a NIS or LDAP group. This must be performed on the
       corresponding server.

       If the groupname already exists in an external group database such as
       NIS or LDAP, groupadd will deny the group creation request.

EXIT VALUES         top

       The groupadd command exits with the following values:

       0
           success

       2
           invalid command syntax

       3
           invalid argument to option

       4
           GID not unique (when -o not used)

       9
           group name not unique

       10
           can't update group file

SEE ALSO         top

       chfn(1), chsh(1), passwd(1), gpasswd(8), groupdel(8), groupmod(8),
       login.defs(5), useradd(8), userdel(8), usermod(8).

COLOPHON         top

       This page is part of the shadow-utils (utilities for managing
       accounts and shadow password files) project.  Information about the
       project can be found at ⟨http://pkg-shadow.alioth.debian.org/⟩.  If
       you have a bug report for this manual page, see 
       ⟨http://pkg-shadow.alioth.debian.org/getinvolved.php⟩.  This page was
       obtained from the project's upstream Git repository 
       ⟨git://anonscm.debian.org/git/pkg-shadow/shadow.git⟩ on 2017-07-05.
       If you discover any rendering problems in this HTML version of the
       page, or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the information
       in this COLOPHON (which is not part of the original manual page),
       send a mail to man-pages@man7.org

shadow-utils 4.4                 07/05/2017                      GROUPADD(8)

Pages that refer to this page: gpasswd(1)chgpasswd(8)groupdel(8)groupmems(8)groupmod(8)useradd(8)userdel(8)usermod(8)