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+'\" t
+.\" Title: chpasswd
+.\" Author: Julianne Frances Haugh
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\" Date: 23/01/2020
+.\" Manual: Comandi per la gestione del sistema
+.\" Source: shadow-utils 4.8.1
+.\" Language: Italian
+.\"
+.TH "CHPASSWD" "8" "23/01/2020" "shadow\-utils 4\&.8\&.1" "Comandi per la gestione del si"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NOME"
+chpasswd \- aggiorna le password in modo non interattivo
+.SH "SINOSSI"
+.HP \w'\fBchpasswd\fR\ 'u
+\fBchpasswd\fR [\fIopzioni\fR]
+.SH "DESCRIZIONE"
+.PP
+The
+\fBchpasswd\fR
+command reads a list of user name and password pairs from standard input and uses this information to update a group of existing users\&. Each line is of the format:
+.PP
+\fIuser_name\fR:\fIpassword\fR
+.PP
+By default the passwords must be supplied in clear\-text, and are encrypted by
+\fBchpasswd\fR\&. Also the password age will be updated, if present\&.
+.PP
+The default encryption algorithm can be defined for the system with the
+\fBENCRYPT_METHOD\fR
+or
+\fBMD5_CRYPT_ENAB\fR
+variables of
+/etc/login\&.defs, and can be overwritten with the
+\fB\-e\fR,
+\fB\-m\fR, or
+\fB\-c\fR
+options\&.
+.PP
+\fBchpasswd\fR
+first updates all the passwords in memory, and then commits all the changes to disk if no errors occurred for any user\&.
+.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
+\fBchpasswd\fR
+command are:
+.PP
+\fB\-c\fR, \fB\-\-crypt\-method\fR\ \&\fIMETHOD\fR
+.RS 4
+Utilizza il metodo specificato per cifrare le password\&.
+.sp
+I metodi disponibili sono DES, MD5, NONE e SHA256 o SHA512 se la propria libc lo consente\&.
+.sp
+By default (if none of the
+\fB\-c\fR,
+\fB\-m\fR, or
+\fB\-e\fR
+options are specified), the encryption method is defined by the
+\fBENCRYPT_METHOD\fR
+or
+\fBMD5_CRYPT_ENAB\fR
+variables of
+/etc/login\&.defs\&.
+.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\&.
+.RE
+.PP
+\fB\-s\fR, \fB\-\-sha\-rounds\fR\ \&\fIROUNDS\fR
+.RS 4
+Usa il numero specificato di cicli per cifrare la password\&.
+.sp
+Il valore 0 indica che il sistema utilizzer\(`a il numero predefinito di cicli per il metodo crypt (5000)\&.
+.sp
+I valori minimo di 1\&.000 e massimo di 999\&.999\&.999 sono forzati\&.
+.sp
+Si pu\(`o utilizzare questa opzione solo con i metodi di cifratura SHA256 o SHA512\&.
+.sp
+By default, the number of rounds is defined by the
+\fBSHA_CRYPT_MIN_ROUNDS\fR
+and
+\fBSHA_CRYPT_MAX_ROUNDS\fR
+variables in
+/etc/login\&.defs\&.
+.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\&.
+.SH "CONFIGURAZIONE"
+.PP
+The following configuration variables in
+/etc/login\&.defs
+change the behavior of this tool:
+.PP
+\fBENCRYPT_METHOD\fR (string)
+.RS 4
+Definisce l\*(Aqalgoritmo di cifratura predefinito per le password (se non ne viene specificato uno a riga di comando)\&.
+.sp
+It can take one of these values:
+\fIDES\fR
+(default),
+\fIMD5\fR, \fISHA256\fR, \fISHA512\fR\&.
+.sp
+Note: this parameter overrides the
+\fBMD5_CRYPT_ENAB\fR
+variable\&.
+.RE
+.PP
+\fBMD5_CRYPT_ENAB\fR (boolean)
+.RS 4
+Indicate if passwords must be encrypted using the MD5\-based algorithm\&. If set to
+\fIyes\fR, 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
+\fIno\fR
+if you need to copy encrypted passwords to other systems which don\*(Aqt understand the new algorithm\&. Default is
+\fIno\fR\&.
+.sp
+This variable is superseded by the
+\fBENCRYPT_METHOD\fR
+variable or by any command line option used to configure the encryption algorithm\&.
+.sp
+This variable is deprecated\&. You should use
+\fBENCRYPT_METHOD\fR\&.
+.RE
+.PP
+\fBSHA_CRYPT_MIN_ROUNDS\fR (number), \fBSHA_CRYPT_MAX_ROUNDS\fR (number)
+.RS 4
+When
+\fBENCRYPT_METHOD\fR
+is set to
+\fISHA256\fR
+or
+\fISHA512\fR, 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)\&.
+.sp
+Con molti cicli \(`e pi\(`u difficile trovare una password usando la forza bruta\&. Ma va notato che \(`e richiesta maggiore potenza di calcolo per autenticare gli utenti\&.
+.sp
+Se non specificato sar\(`a la libc a scegliere il numero di cicli (5000)\&.
+.sp
+Il valore deve essere compreso tra 1\&.000 e 999\&.999\&.999\&.
+.sp
+If only one of the
+\fBSHA_CRYPT_MIN_ROUNDS\fR
+or
+\fBSHA_CRYPT_MAX_ROUNDS\fR
+values is set, then this value will be used\&.
+.sp
+If
+\fBSHA_CRYPT_MIN_ROUNDS\fR
+>
+\fBSHA_CRYPT_MAX_ROUNDS\fR, the highest value will be used\&.
+.RE
+.SH "FILE"
+.PP
+/etc/passwd
+.RS 4
+Informazioni sugli account utente\&.
+.RE
+.PP
+/etc/shadow
+.RS 4
+Informazioni sicure sugli account utente\&.
+.RE
+.PP
+/etc/login\&.defs
+.RS 4
+Configurazione del pacchetto password shadow
+.RE
+.SH "VEDERE ANCHE"
+.PP
+\fBpasswd\fR(1),
+\fBnewusers\fR(8),
+\fBlogin.defs\fR(5),
+\fBuseradd\fR(8)\&.