table of contents
PWCONV(8) | Commandes de gestion du systèm | PWCONV(8) |
NOM¶
pwconv, pwunconv, grpconv, grpunconv - Convertir vers ou depuis les fichiers de mots de passe ou de groupe cachés
SYNOPSIS¶
pwconv [options]
pwunconv [options]
grpconv [options]
grpunconv [options]
DESCRIPTION¶
The pwconv command creates shadow from passwd and an optionally existing shadow.
The pwunconv command creates passwd from passwd and shadow and then removes shadow.
The grpconv command creates gshadow from group and an optionally existing gshadow.
The grpunconv command creates group from group and gshadow and then removes gshadow.
These four programs all operate on the normal and shadow password and group files: /etc/passwd, /etc/group, /etc/shadow, and /etc/gshadow.
Each program acquires the necessary locks before conversion. pwconv and grpconv are similar. First, entries in the shadowed file which don't exist in the main file are removed. Then, shadowed entries which don't have `x' as the password in the main file are updated. Any missing shadowed entries are added. Finally, passwords in the main file are replaced with `x'. These programs can be used for initial conversion as well to update the shadowed file if the main file is edited by hand.
pwconv will use the values of PASS_MIN_DAYS, PASS_MAX_DAYS, and PASS_WARN_AGE from /etc/login.defs when adding new entries to /etc/shadow.
Likewise pwunconv and grpunconv are similar. Passwords in the main file are updated from the shadowed file. Entries which exist in the main file but not in the shadowed file are left alone. Finally, the shadowed file is removed. Some password aging information is lost by pwunconv. It will convert what it can.
OPTIONS¶
The options which apply to the pwconv, pwunconv, grpconv, and grpunconv commands are:
-h, --help
-R, --root CHROOT_DIR
BOGUES¶
Errors in the password or group files (such as invalid or duplicate entries) may cause these programs to loop forever or fail in other strange ways. Please run pwck and grpck to correct any such errors before converting to or from shadow passwords or groups.
CONFIGURATION¶
The following configuration variable in /etc/login.defs changes the behavior of grpconv and grpunconv:
MAX_MEMBERS_PER_GROUP (number)
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.
The following configuration variables in /etc/login.defs change the behavior of pwconv:
PASS_MAX_DAYS (number)
PASS_MIN_DAYS (number)
PASS_WARN_AGE (number)
FICHIERS¶
/etc/login.defs
VOIR AUSSI¶
19/04/2024 | shadow-utils 4.6 |