GROUPMEMS(8) System Management Commands GROUPMEMS(8)

groupmems - Administrer les membres du groupe primaire d'un utilisateur

groupmems -a user_name | -d user_name | [-g group_name] | -l | -p

The groupmems command allows a user to administer their own group membership list without the requirement of superuser privileges. The groupmems utility is for systems that configure its users to be in their own name sake primary group (i.e., guest / guest).

Only the superuser, as administrator, can use groupmems to alter the memberships of other groups.

The options which apply to the groupmems command are:

-a, --add user_name

Ajouter un utilisateur à la liste des membres du groupe.

If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a new entry will be created.

-d, --delete user_name

Supprimer un utilisateur de la liste des membres du groupe.

If the /etc/gshadow file exist, the user will be removed from the list of members and administrators of the group.

If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a new entry will be created.

-g, --group group_name

Le superutilisateur peut préciser la liste des membres du groupe à modifier.

-h, --help

Afficher un message d'aide et quitter.

-l, --list

Afficher la liste des membres du groupe.

-p, --purge

Supprimer tous les utilisateurs de la liste des membres du groupe.

If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a new entry will be created.

-R, --root CHROOT_DIR

Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. Only absolute paths are supported.

The groupmems executable should be in mode 2710 as user root and in group groups. The system administrator can add users to group groups to allow or disallow them using the groupmems utility to manage their own group membership list.

	$ groupadd -r groups
	$ chmod 2710 groupmems
	$ chown root:groups groupmems
	$ groupmems -g groups -a gk4

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

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.

/etc/group

Informations sur les groupes.

/etc/gshadow

informations cachées sur les groupes

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

02/07/2024 shadow-utils 4.16.0