Provided by: passwd_4.1.1-1ubuntu1_i386 bug

NOM

       newusers - Mettre à jour, ou créer de nouveaux utilisateurs par lots

SYNOPSIS

       newusers [nouveaux_utilisateurs]

DESCRIPTION

       The newusers command reads a file of user name and clear-text password
       pairs and uses this information to update a group of existing users or
       to create new users. Each line is in the same format as the standard
       password file (see passwd(5)) with the following exceptions:

       pw_passwd
           Ce champ sera chiffré et utilisé comme la nouvelle valeur du mot de
           passe chiffré.

       pw_gid
           This field must contain the name (or number) of a group. The user
           will be added as a member to this group. When a non-existent group
           name or number is specified, a new group will be created. In the
           case of a non-existent group number, both the name and the number
           of the new group will be this number.

       pw_dir
           This field will be checked for existence as a directory, and a new
           directory with this name will be created if it does not already
           exist. The ownership of the directory will be set to be that of the
           user being created or updated.

       Cette commande a été conçue pour les gros systèmes pour lesquels un
       grand nombre de comptes sont mis à jour à un même instant.

AVERTISSEMENTS

       Le fichier d´entrée doit être correctement protégé puisqu´il contient
       des mots de passe en clair.

       PAM is not used to update the passwords. Only /etc/passwd and
       /etc/shadow are updated, and the various checks or options provided by
       PAM modules are not used.

CONFIGURATION

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

       ENCRYPT_METHOD (string)
           This defines the system default encryption algorithm for encrypting
           passwords (if no algorithm are specified on the command line).

           It can take one of these values:

           ·   DES (default)

           ·   MD5

           ·   SHA256

           ·   SHA512

               Note: this parameter overrides the MD5_CRYPT_ENAB variable.

               Note: if you use PAM, it is recommended to set this variable
               consistently with the PAM modules configuration.

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

       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.

       MD5_CRYPT_ENAB (boolean)
           Indicate if passwords must be encrypted using the MD5-based
           algorithm. If set to yes, new passwords will be encrypted using the
           MD5-based algorithm compatible with the one used by recent releases
           of FreeBSD. It supports passwords of unlimited length and longer
           salt strings. Set to no if you need to copy encrypted passwords to
           other systems which don´t understand the new algorithm. Default is
           no.

           This variable is superceded by the ENCRYPT_METHOD variable or by
           any command line option used to configure the encryption algorithm.

           This variable is deprecated. You should use ENCRYPT_METHOD.

           Note: if you use PAM, it is recommended to set this variable
           consistently with the PAM modules configuration.

       PASS_MAX_DAYS (number)
           Nombre maximum de jours de validité d´un mot de passe. Après cette
           durée, une modification du mot de passe est obligatoire. S´il n´est
           pas précisé, la valeur de -1 est utilisée (ce qui enlève toute
           restriction).

       PASS_MIN_DAYS (number)
           Nombre minimum de jours autorisé avant la modification d´un mot de
           passe. Toute tentative de modification du mot de passe avant cette
           durée est rejetée. S´il n´est pas précisé, la valeur de -1 est
           utilisée (ce qui enlève toute restriction).

       PASS_WARN_AGE (number)
           Nombre de jours durant lesquels l´utilisateur recevra un
           avertissement avant que son mot de passe n´arrive en fin de
           validité. Une valeur négative signifie qu´aucun avertissement n´est
           donné. S´il n´est pas précisé, aucun avertissement n´est donné.

       SHA_CRYPT_MIN_ROUNDS (number), SHA_CRYPT_MAX_ROUNDS (number)
           When ENCRYPT_METHOD is set to SHA256 or SHA512, this defines the
           number of SHA rounds used by the encryption algorithm by default
           (when the number of rounds is not specified on the command line).

           With a lot of rounds, it is more difficult to brute forcing the
           password. But note also that more CPU resources will be needed to
           authenticate users.

           If not specified, the libc will choose the default number of rounds
           (5000).

           The values must be inside the 1000-999999999 range.

           If only one of the SHA_CRYPT_MIN_ROUNDS or SHA_CRYPT_MAX_ROUNDS
           values is set, then this value will be used.

           If SHA_CRYPT_MIN_ROUNDS > SHA_CRYPT_MAX_ROUNDS, the highest value
           will be used.

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

       SYS_UID_MAX (number), SYS_UID_MIN (number)
           Range of user IDs used for the creation of system users by useradd
           or newusers.

       UID_MAX (number), UID_MIN (number)
           Range of user IDs used for the creation of regular users by useradd
           or newusers.

       UMASK (number)
           Valeur d´initialisation du masque de permissions. S´il n´est pas
           précisé, le masque des permissions sera initialisé à 022.

FICHIERS

       /etc/passwd
           Informations sur les comptes des utilisateurs.

       /etc/shadow
           Informations sécurisées sur les comptes utilisateurs.

       /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 ».

VOIR AUSSI

       login.defs(5), passwd(1), useradd(8).