'\" t
.\"     Title: chgpasswd
.\"    Author: Thomas K\(/loczko <kloczek@pld.org.pl>
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 01/04/2024
.\"    Manual: System Management Commands
.\"    Source: shadow-utils 4.15.1
.\"  Language: Italian
.\"
.TH "CHGPASSWD" "8" "01/04/2024" "shadow\-utils 4\&.15\&.1" "System Management Commands"
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.SH "NOME"
chgpasswd \- aggiorna le password di gruppo in modalit\(`a non interattiva
.SH "SINOSSI"
.HP \w'\fBchgpasswd\fR\ 'u
\fBchgpasswd\fR [\fIoptions\fR]
.SH "DESCRIZIONE"
.PP
The
\fBchgpasswd\fR
command reads a list of group name and password pairs from standard input and uses this information to update a set of existing groups\&. Each line is of the format:
.PP
\fIgroup_name\fR:\fIpassword\fR
.PP
By default the supplied password must be in clear\-text, and is encrypted by
\fBchgpasswd\fR\&.
.PP
The default encryption algorithm can be defined for the system with the
\fBENCRYPT_METHOD\fR
variable of
/etc/login\&.defs, and can be overwritten with the
\fB\-e\fR,
\fB\-m\fR, or
\fB\-c\fR
options\&.
.PP
Questo comando \(`e appositamente pensato per grossi sistemi in cui si abbia la necessit\(`a di creare molti account nello stesso momento\&.
.SH "OPZIONI"
.PP
The options which apply to the
\fBchgpasswd\fR
command are:
.PP
\fB\-c\fR, \fB\-\-crypt\-method\fR
.RS 4
Utilizza il metodo specificato per cifrare le password\&.
.sp
The available methods are
\fIDES\fR,
\fIMD5\fR, \fISHA256\fR, \fISHA512\fR, \fIYESCRYPT\fR
and
\fINONE\fR
if your libc supports these methods\&.
.RE
.PP
\fB\-e\fR, \fB\-\-encrypted\fR
.RS 4
Le password fornite sono in forma cifrata\&.
.RE
.PP
\fB\-h\fR, \fB\-\-help\fR
.RS 4
Mostra un messaggio di aiuto ed esce\&.
.RE
.PP
\fB\-m\fR, \fB\-\-md5\fR
.RS 4
Usa la cifratura MD5 anzich\('e DES quando le password fornite non sono cifrate\&.
.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\&.
.RE
.PP
\fB\-s\fR, \fB\-\-sha\-rounds\fR
.RS 4
Usa il numero specificato di cicli per cifrare la password\&.
.sp
You can only use this option with crypt method:
\fISHA256\fR \fISHA512\fR
\fIYESCRYPT\fR
.sp
By default, the number of rounds for SHA256 or SHA512 is defined by the SHA_CRYPT_MIN_ROUNDS and SHA_CRYPT_MAX_ROUNDS variables in
/etc/login\&.defs\&.
.sp
A minimal value of 1000 and a maximal value of 999,999,999 will be enforced for SHA256 and SHA512\&. The default number of rounds is 5000\&.
.sp
By default, the number of rounds for YESCRYPT is defined by the YESCRYPT_COST_FACTOR in
/etc/login\&.defs\&.
.sp
A minimal value of 1 and a maximal value of 11 will be enforced for YESCRYPT\&. The default number of rounds is 5\&.
.RE
.SH "AVVISI/CAVEAT"
.PP
Ricordarsi di impostare i permessi o umask in modo da prevenire la lettura in chiaro da parte di altri utenti\&.
.PP
Ci si deve accertare che le password e il metodo di cifratura rispettino le norme delle password del sistema\&.
.SH "CONFIGURAZIONE"
.PP
The following configuration variables in
/etc/login\&.defs
change the behavior of this tool:
.SH "FILE"
.PP
/etc/group
.RS 4
Informazioni sugli account di gruppo\&.
.RE
.PP
/etc/gshadow
.RS 4
Informazioni sicure sugli account di gruppo\&.
.RE
.PP
/etc/login\&.defs
.RS 4
Configurazione del pacchetto password shadow
.RE
.SH "VEDERE ANCHE"
.PP
\fBgpasswd\fR(1),
\fBgroupadd\fR(8),
\fBlogin.defs\fR(5)\&.