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).