'\" t
.\"     Title: pwconv
.\"    Author: Marek Micha\(/lkiewicz
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 06/02/2024
.\"    Manual: Commandes de gestion du syst\(`eme
.\"    Source: shadow-utils 4.8.1
.\"  Language: French
.\"
.TH "PWCONV" "8" "06/02/2024" "shadow\-utils 4\&.8\&.1" "Commandes de gestion du syst\(`em"
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.el       .ds Aq '
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.SH "NOM"
pwconv, pwunconv, grpconv, grpunconv \- Convertir vers ou depuis les fichiers de mots de passe ou de groupe cach\('es
.SH "SYNOPSIS"
.HP \w'\fBpwconv\fR\ 'u
\fBpwconv\fR [\fIoptions\fR]
.HP \w'\fBpwunconv\fR\ 'u
\fBpwunconv\fR [\fIoptions\fR]
.HP \w'\fBgrpconv\fR\ 'u
\fBgrpconv\fR [\fIoptions\fR]
.HP \w'\fBgrpunconv\fR\ 'u
\fBgrpunconv\fR [\fIoptions\fR]
.SH "DESCRIPTION"
.PP
The
\fBpwconv\fR
command creates
\fIshadow\fR
from
\fIpasswd\fR
and an optionally existing
\fIshadow\fR\&.
.PP
The
\fBpwunconv\fR
command creates
\fIpasswd\fR
from
\fIpasswd\fR
and
\fIshadow\fR
and then removes
\fIshadow\fR\&.
.PP
The
\fBgrpconv\fR
command creates
\fIgshadow\fR
from
\fIgroup\fR
and an optionally existing
\fIgshadow\fR\&.
.PP
The
\fBgrpunconv\fR
command creates
\fIgroup\fR
from
\fIgroup\fR
and
\fIgshadow\fR
and then removes
\fIgshadow\fR\&.
.PP
These four programs all operate on the normal and shadow password and group files:
/etc/passwd,
/etc/group,
/etc/shadow, and
/etc/gshadow\&.
.PP
Each program acquires the necessary locks before conversion\&.
\fBpwconv\fR
and
\fBgrpconv\fR
are similar\&. First, entries in the shadowed file which don\*(Aqt exist in the main file are removed\&. Then, shadowed entries which don\*(Aqt have `x\*(Aq 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\*(Aq\&. These programs can be used for initial conversion as well to update the shadowed file if the main file is edited by hand\&.
.PP
\fBpwconv\fR
will use the values of
\fIPASS_MIN_DAYS\fR,
\fIPASS_MAX_DAYS\fR, and
\fIPASS_WARN_AGE\fR
from
/etc/login\&.defs
when adding new entries to
/etc/shadow\&.
.PP
Likewise
\fBpwunconv\fR
and
\fBgrpunconv\fR
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
\fBpwunconv\fR\&. It will convert what it can\&.
.SH "OPTIONS"
.PP
The options which apply to the
\fBpwconv\fR,
\fBpwunconv\fR,
\fBgrpconv\fR, and
\fBgrpunconv\fR
commands are:
.PP
\fB\-h\fR, \fB\-\-help\fR
.RS 4
Afficher un message d\*(Aqaide et quitter\&.
.RE
.PP
\fB\-R\fR, \fB\-\-root\fR\ \&\fICHROOT_DIR\fR
.RS 4
Apply changes in the
\fICHROOT_DIR\fR
directory and use the configuration files from the
\fICHROOT_DIR\fR
directory\&.
.RE
.SH "BOGUES"
.PP
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
\fBpwck\fR
and
\fBgrpck\fR
to correct any such errors before converting to or from shadow passwords or groups\&.
.SH "CONFIGURATION"
.PP
The following configuration variable in
/etc/login\&.defs
changes the behavior of
\fBgrpconv\fR
and
\fBgrpunconv\fR:
.PP
\fBMAX_MEMBERS_PER_GROUP\fR (number)
.RS 4
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)\&.
.sp
La valeur par d\('efaut est 0, ce qui signifie qu\*(Aqil n\*(Aqy a pas de limites pour le nombre de membres dans un groupe\&.
.sp
Cette fonctionnalit\('e (groupe d\('ecoup\('e) permet de limiter la longueur des lignes dans le fichier de groupes\&. Ceci est utile pour s\*(Aqassurer que les lignes pour les groupes NIS ne sont pas plus grandes que 1024 caract\(`eres\&.
.sp
Si vous avez besoin de configurer cette limite, vous pouvez utiliser 25\&.
.sp
Remarque\ \&: les groupes d\('ecoup\('es ne sont peut\-\(^etre pas pris en charge par tous les outils (m\(^eme dans la suite d\*(Aqoutils Shadow)\&. Vous ne devriez pas utiliser cette variable, sauf si vous en avez vraiment besoin\&.
.RE
.PP
The following configuration variables in
/etc/login\&.defs
change the behavior of
\fBpwconv\fR:
.PP
\fBPASS_MAX_DAYS\fR (number)
.RS 4
Nombre maximum de jours de validit\('e d\*(Aqun mot de passe\&. Apr\(`es cette dur\('ee, une modification du mot de passe est obligatoire\&. S\*(Aqil n\*(Aqest pas pr\('ecis\('e, la valeur de \-1 est utilis\('ee (ce qui enl\(`eve toute restriction)\&.
.RE
.PP
\fBPASS_MIN_DAYS\fR (number)
.RS 4
Nombre minimum de jours autoris\('e avant la modification d\*(Aqun mot de passe\&. Toute tentative de modification du mot de passe avant cette dur\('ee est rejet\('ee\&. S\*(Aqil n\*(Aqest pas pr\('ecis\('e, la valeur de \-1 est utilis\('ee (ce qui enl\(`eve toute restriction)\&.
.RE
.PP
\fBPASS_WARN_AGE\fR (number)
.RS 4
Nombre de jours durant lesquels l\*(Aqutilisateur recevra un avertissement avant que son mot de passe n\*(Aqarrive en fin de validit\('e\&. Une valeur n\('egative signifie qu\*(Aqaucun avertissement n\*(Aqest donn\('e\&. S\*(Aqil n\*(Aqest pas pr\('ecis\('e, aucun avertissement n\*(Aqest donn\('e\&.
.RE
.SH "FICHIERS"
.PP
/etc/login\&.defs
.RS 4
Configuration de la suite des mots de passe cach\('es \(Fo\ \&shadow password\ \&\(Fc\&.
.RE
.SH "VOIR AUSSI"
.PP
\fBgrpck\fR(8),
\fBlogin.defs\fR(5),
\fBpwck\fR(8)\&.
