GROUPADD(8)

NOM
groupadd - Créer un nouveau groupe

SYNOPSIS

groupadd [options] groupe

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.

OPTIONS

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
    Afficher un message d'aide et quitter.

-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
    Cette option permet d'ajouter un groupe avec un identifiant (« GID ») déjà utilisé.

-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.

    Il est nécessaire de vérifier si le mot de passe respecte la politique de mots de passe du système.

-r, --system
    Créer un groupe système.

    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.

-P, --prefix PREFIX_DIR
    Apply changes in the PREFIX_DIR directory and use the configuration files from the PREFIX_DIR directory. This option does not chroot and is intended for preparing a cross-compilation target. Some limitations: NIS and LDAP users/groups are not verified. PAM authentication is using the host files. No SELINUX support.

CONFIGURATION

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).

    La valeur par défaut est 0, ce qui signifie qu'il n'y a pas de limites pour le nombre de membres dans un groupe.

    Cette fonctionnalité (groupe découpé) permet de limiter la longueur des lignes dans le fichier de groupes. Ceci est utile pour s'assurer que les lignes pour les groupes NIS ne sont pas plus grandes que 1024 caractères.

    Si vous avez besoin de configurer cette limite, vous pouvez utiliser 25.

    Remarque : les groupes découpés ne sont peut-être pas pris en charge par tous les outils (même dans la suite d'outils Shadow). Vous ne devriez pas utiliser cette variable, sauf si vous en avez vraiment besoin.

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).

FICHIERS

/etc/group
    Informations sur les groupes.

/etc/gshadow
    Informations sécurisées sur les groupes.

/etc/login.defs
    Configuration de la suite des mots de passe cachés « shadow password ».

AVERTISSEMENTS

It is usually recommended to only use groupnames that begin 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_-]*[$]?

On Debian, the only constraints are that groupnames must neither start with a dash ('-') nor plus ('+') nor tilde ('~') nor contain a colon (':'), a comma (','), or a whitespace (space:' ', end of line: '\n', tabulation: '\t', etc.).

On Ubuntu, the same constraints as Debian are in place, with the additional constraint that the groupname cannot be fully numeric. This includes octal and hexadecimal syntax.

Groupnames may only be up to 32 characters long.

Vous ne pouvez pas ajouter d'utilisateur à un groupe NIS ou LDAP. Cela doit être effectué sur le serveur correspondant.

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

VALEURS DE RETOUR

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

VOIR AUSSI

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