'\" t
.\"     Title: pwconv
.\"    Author: Marek Micha\(/lkiewicz
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 07/30/2026
.\"    Manual: System Management Commands
.\"    Source: shadow-utils 4.20.0
.\"  Language: Russian
.\"
.TH "pwconv" "8" "07/30/2026" "shadow\-utils 4\&.20\&.0" "System Management Commands"
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.el       .ds Aq '
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.SH "ИМЯ"
pwconv, pwunconv, grpconv, grpunconv \- convert between the system\*(Aqs shadowed and plain account files
.SH "СИНОПСИС"
.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 "ОПИСАНИЕ"
.PP
The
\fBpwconv\fR
command creates
shadow
from
passwd
and an optionally existing
shadow\&.
.PP
The
\fBpwunconv\fR
command creates a plain
passwd
from shadowed
passwd
and
shadow
and then removes
shadow\&.
.PP
The
\fBgrpconv\fR
command creates
gshadow
from
group
and an optionally existing
gshadow\&.
.PP
The
\fBgrpunconv\fR
command creates plain
group
from shadowed
group
and
gshadow
and then removes
gshadow\&.
.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 plain file are removed\&. Then, entries in the shadowed file which don\*(Aqt have `x\*(Aq as the password in plain file are updated\&. Any missing shadowed entries are added\&. Finally, passwords in the plain file are replaced with `x\*(Aq\&. These programs can be used for initial conversion as well to update the shadowed file if the plain file has been edited by hand\&.
.PP
\fBpwconv\fR
will use the values of
\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 plain file are updated from the shadowed file\&. Entries which exist in the plain 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 "ПАРАМЕТРЫ"
.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
Показать краткую справку и закончить работу\&.
.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\&. Only absolute paths are supported\&. No SELINUX support\&.
.RE
.SH "ОШИБКИ РЕАЛИЗАЦИИ"
.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 shadowed files\&.
.SH "НАСТРОЙКА"
.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
Значение по умолчанию равно 0, означающее, что ограничения на количество членов в группе нет\&.
.sp
Данная возможность (разделение группы) позволяет ограничить длину строк в файле групп\&. Это полезно для ограничения длины строк групп NIS в 1024 символа\&.
.sp
Если вам нужно такое ограничение, укажите значение 25\&.
.sp
Замечание: разделение групп поддерживается не всеми инструментами (даже в наборе инструментов Shadow)\&. Вы не должны использовать эту переменную, если вам действительно это ненужно\&.
.RE
.PP
The following configuration variables in
/etc/login\&.defs
change the behavior of
\fBpwconv\fR:
.PP
\fBPASS_MAX_DAYS\fR (number)
.RS 4
Максимальное число дней использования пароля\&. Если пароль старее этого числа, то будет запущена процедура смены пароля\&. Если значение не задано, то предполагается значение \-1 (то есть возможность ограничения не используется)\&.
.RE
.PP
\fBPASS_WARN_AGE\fR (number)
.RS 4
The number of days warning given before a password expires\&. A zero means warning is given only upon the day of expiration, a value of \-1 means no warning is given\&. If not specified, no warning will be provided\&.
.RE
.SH "ФАЙЛЫ"
.PP
/etc/login\&.defs
.RS 4
содержит конфигурацию подсистемы теневых паролей
.RE
.SH "СМОТРИТЕ ТАКЖЕ"
.PP
\fBgrpck\fR(8),
\fBlogin.defs\fR(5),
\fBpwck\fR(8)\&.