632 lines
17 KiB
Groff
632 lines
17 KiB
Groff
'\" t
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.\" Title: useradd
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.\" Author: Julianne Frances Haugh
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.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
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.\" Date: 19/03/2025
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.\" Manual: System Management Commands
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.\" Source: shadow-utils 4.17.4
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.\" Language: Italian
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.\"
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.TH "USERADD" "8" "19/03/2025" "shadow\-utils 4\&.17\&.4" "System Management Commands"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NOME"
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useradd \- crea un nuovo utente o aggiorna le informazioni predefinite per i nuovi utenti
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.SH "SINOSSI"
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.HP \w'\fBuseradd\fR\ 'u
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\fBuseradd\fR [\fIoptions\fR] \fILOGIN\fR
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.HP \w'\fBuseradd\fR\ 'u
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\fBuseradd\fR \-D
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.HP \w'\fBuseradd\fR\ 'u
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\fBuseradd\fR \-D [\fIoptions\fR]
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.SH "DESCRIZIONE"
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.PP
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When invoked without the
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\fB\-D\fR
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option, the
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\fBuseradd\fR
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command creates a new user account using the values specified on the command line plus the default values from the system\&. Depending on command line options, the
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\fBuseradd\fR
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command will update system files and may also create the new user\*(Aqs home directory and copy initial files\&.
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.PP
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By default, a group will also be created for the new user (see
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\fB\-g\fR,
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\fB\-N\fR,
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\fB\-U\fR, and
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\fBUSERGROUPS_ENAB\fR)\&.
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.SH "OPZIONI"
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.PP
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The options which apply to the
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\fBuseradd\fR
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command are:
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.PP
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\fB\-\-badname\fR\ \&
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.RS 4
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Allow names that do not conform to standards\&.
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.RE
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.PP
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\fB\-b\fR, \fB\-\-base\-dir\fR\ \&\fIBASE_DIR\fR
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.RS 4
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The default base directory for the system if
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\fB\-d\fR\ \&\fIHOME_DIR\fR
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is not specified\&.
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\fIBASE_DIR\fR
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is concatenated with the account name to define the home directory\&.
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.sp
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If this option is not specified,
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\fBuseradd\fR
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will use the base directory specified by the
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\fBHOME\fR
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variable in
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/etc/default/useradd, or
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/home
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by default\&.
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.RE
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.PP
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\fB\-c\fR, \fB\-\-comment\fR\ \&\fICOMMENT\fR
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.RS 4
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Any text string\&. It is generally a short description of the account, and is currently used as the field for the user\*(Aqs full name\&.
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.RE
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.PP
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\fB\-d\fR, \fB\-\-home\-dir\fR\ \&\fIHOME_DIR\fR
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.RS 4
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The new user will be created using
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\fIHOME_DIR\fR
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as the value for the user\*(Aqs login directory\&. The default is to append the
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\fILOGIN\fR
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name to
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\fIBASE_DIR\fR
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and use that as the login directory name\&. If the directory
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\fIHOME_DIR\fR
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does not exist, then it will be created unless the
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\fB\-M\fR
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option is specified\&.
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.RE
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.PP
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\fB\-D\fR, \fB\-\-defaults\fR
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.RS 4
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Vedere oltre, la sezione \(FoCambiare i valori predefiniti\(Fc\&.
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.RE
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.PP
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\fB\-e\fR, \fB\-\-expiredate\fR\ \&\fIEXPIRE_DATE\fR
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.RS 4
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The date on which the user account will be disabled\&. The date is specified in the format
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\fIYYYY\-MM\-DD\fR\&.
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.sp
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If not specified,
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\fBuseradd\fR
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will use the default expiry date specified by the
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\fBEXPIRE\fR
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variable in
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/etc/default/useradd, or an empty string (no expiry) by default\&.
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.RE
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.PP
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\fB\-f\fR, \fB\-\-inactive\fR\ \&\fIINACTIVE\fR
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.RS 4
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defines the number of days after the password exceeded its maximum age where the user is expected to replace this password\&. The value is stored in the shadow password file\&. An input of 0 will disable an expired password with no delay\&. An input of \-1 will blank the respective field in the shadow password file\&. See
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\fBshadow\fR(5)for more information\&.
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.sp
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If not specified,
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\fBuseradd\fR
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will use the default inactivity period specified by the
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\fBINACTIVE\fR
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variable in
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/etc/default/useradd, or \-1 by default\&.
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.RE
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.PP
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\fB\-F\fR, \fB\-\-add\-subids\-for\-system\fR
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.RS 4
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Update
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/etc/subuid
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and
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/etc/subgid
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even when creating a system account with
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\fB\-r\fR
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option\&.
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.RE
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.PP
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\fB\-g\fR, \fB\-\-gid\fR\ \&\fIGROUP\fR
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.RS 4
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The name or the number of the user\*(Aqs primary group\&. The group name must exist\&. A group number must refer to an already existing group\&.
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.sp
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If not specified, the behavior of
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\fBuseradd\fR
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will depend on the
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\fBUSERGROUPS_ENAB\fR
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variable in
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/etc/login\&.defs\&. If this variable is set to
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\fIyes\fR
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(or
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\fB\-U/\-\-user\-group\fR
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is specified on the command line), a group will be created for the user, with the same name as the loginname\&. If the variable is set to
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\fIno\fR
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(or
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\fB\-N/\-\-no\-user\-group\fR
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is specified on the command line), useradd will set the primary group of the new user to the value specified by the
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\fBGROUP\fR
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variable in
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/etc/default/useradd, or 1000 by default\&.
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.RE
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.PP
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\fB\-G\fR, \fB\-\-groups\fR\ \&\fIGROUP1\fR[\fI,GROUP2,\&.\&.\&.\fR[\fI,GROUPN\fR]]]
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.RS 4
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A list of supplementary groups which the user is also a member of\&. Each group is separated from the next by a comma, with no intervening whitespace\&. The groups are subject to the same restrictions as the group given with the
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\fB\-g\fR
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option\&. The default is for the user to belong only to the initial group\&. In addition to passing in the \-G flag, you can add the option
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\fBGROUPS\fR
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to the file
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/etc/default/useradd
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which in turn will add all users to those supplementary groups\&.
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.RE
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.PP
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\fB\-h\fR, \fB\-\-help\fR
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.RS 4
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Mostra un messaggio di aiuto ed esce\&.
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.RE
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.PP
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\fB\-k\fR, \fB\-\-skel\fR\ \&\fISKEL_DIR\fR
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.RS 4
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The skeleton directory, which contains files and directories to be copied in the user\*(Aqs home directory, when the home directory is created by
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\fBuseradd\fR\&.
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.sp
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This option is only valid if the
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\fB\-m\fR
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(or
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\fB\-\-create\-home\fR) option is specified\&.
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.sp
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If this option is not set, the skeleton directory is defined by the
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\fBSKEL\fR
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variable in
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/etc/default/useradd
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or, by default,
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/etc/skel\&.
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.sp
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Absolute symlinks that link back to the skel directory will have the
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/etc/skel
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prefix replaced with the user\*(Aqs home directory\&.
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.sp
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Se possibile vengono copiate le ACL e gli attributi estesi\&.
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.RE
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.PP
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\fB\-K\fR, \fB\-\-key\fR\ \&\fIKEY\fR=\fIVALUE\fR
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.RS 4
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Overrides
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/etc/login\&.defs
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defaults (\fBUID_MIN\fR,
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\fBUID_MAX\fR,
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\fBUMASK\fR,
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\fBPASS_MAX_DAYS\fR
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and others)\&.
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.sp
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Example:
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\fB\-K\fR\ \&\fIPASS_MAX_DAYS \fR=\fI\-1\fR
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can be used when creating an account to turn off password aging\&. Multiple
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\fB\-K\fR
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options can be specified, e\&.g\&.:
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\fB\-K\fR\ \&\fIUID_MIN\fR
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=\fI100\fR\ \&\fB\-K\fR\ \&
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\fIUID_MAX\fR=\fI499\fR
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.RE
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.PP
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\fB\-l\fR, \fB\-\-no\-log\-init\fR
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.RS 4
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Non aggiunge l\*(Aqutente ai database \(Folastlog\(Fc e \(Fofaillog\(Fc\&.
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.sp
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By default, the user\*(Aqs entries in the lastlog and faillog databases are reset to avoid reusing the entry from a previously deleted user\&.
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.sp
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If this option is not specified,
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\fBuseradd\fR
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will also consult the variable
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\fBLOG_INIT\fR
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in the
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/etc/default/useradd
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if set to no the user will not be added to the lastlog and faillog databases\&.
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.RE
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.PP
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\fB\-m\fR, \fB\-\-create\-home\fR
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.RS 4
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Create the user\*(Aqs home directory if it does not exist\&. The files and directories contained in the skeleton directory (which can be defined with the
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\fB\-k\fR
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option) will be copied to the home directory\&.
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.sp
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By default, if this option is not specified and
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\fBCREATE_HOME\fR
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is not enabled, no home directories are created\&.
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.sp
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The directory where the user\*(Aqs home directory is created must exist and have proper SELinux context and permissions\&. Otherwise the user\*(Aqs home directory cannot be created or accessed\&.
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.RE
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.PP
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\fB\-M\fR, \fB\-\-no\-create\-home\fR
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.RS 4
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Do not create the user\*(Aqs home directory, even if the system wide setting from
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/etc/login\&.defs
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(\fBCREATE_HOME\fR) is set to
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\fIyes\fR\&.
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.RE
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.PP
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\fB\-N\fR, \fB\-\-no\-user\-group\fR
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.RS 4
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Do not create a group with the same name as the user, but add the user to the group specified by the
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\fB\-g\fR
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option or by the
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\fBGROUP\fR
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variable in
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/etc/default/useradd\&.
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.sp
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The default behavior (if the
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\fB\-g\fR,
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\fB\-N\fR, and
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\fB\-U\fR
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options are not specified) is defined by the
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\fBUSERGROUPS_ENAB\fR
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variable in
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/etc/login\&.defs\&.
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.RE
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.PP
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\fB\-o\fR, \fB\-\-non\-unique\fR
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.RS 4
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allows the creation of an account with an already existing UID\&.
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.sp
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This option is only valid in combination with the
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\fB\-u\fR
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option\&. As a user identity serves as key to map between users on one hand and permissions, file ownerships and other aspects that determine the system\*(Aqs behavior on the other hand, more than one login name will access the account of the given UID\&.
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.RE
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.PP
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\fB\-p\fR, \fB\-\-password\fR\ \&\fIPASSWORD\fR
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.RS 4
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defines an initial password for the account\&. PASSWORD is expected to be encrypted, as returned by
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\fBcrypt \fR(3)\&. Within a shell script, this option allows to create efficiently batches of users\&.
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.sp
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Without this option, the new account will be locked and with no password defined, i\&.e\&. a single exclamation mark in the respective field of
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/etc/shadow\&. This is a state where the user won\*(Aqt be able to access the account or to define a password himself\&.
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.sp
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\fBNote:\fRAvoid this option on the command line because the password (or encrypted password) will be visible by users listing the processes\&.
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.sp
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Ci si deve accertare che la password rispetti le norme delle password del sistema\&.
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.RE
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.PP
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\fB\-r\fR, \fB\-\-system\fR
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.RS 4
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Crea un account di sistema\&.
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.sp
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System users will be created with no aging information in
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/etc/shadow, and their numeric identifiers are chosen in the
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\fBSYS_UID_MIN\fR\-\fBSYS_UID_MAX\fR
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range, defined in
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/etc/login\&.defs, instead of
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\fBUID_MIN\fR\-\fBUID_MAX\fR
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(and their
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\fBGID\fR
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counterparts for the creation of groups)\&.
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.sp
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Note that
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\fBuseradd\fR
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will not create a home directory for such a user, regardless of the default setting in
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/etc/login\&.defs
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(\fBCREATE_HOME\fR)\&. You have to specify the
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\fB\-m\fR
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options if you want a home directory for a system account to be created\&.
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.sp
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Note that this option will not update
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/etc/subuid
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and
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/etc/subgid\&. You have to specify the
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\fB\-F\fR
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options if you want to update the files for a system account to be created\&.
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.RE
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.PP
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\fB\-R\fR, \fB\-\-root\fR\ \&\fICHROOT_DIR\fR
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.RS 4
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Apply changes in the
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\fICHROOT_DIR\fR
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directory and use the configuration files from the
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\fICHROOT_DIR\fR
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directory\&. Only absolute paths are supported\&.
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.RE
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.PP
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\fB\-P\fR, \fB\-\-prefix\fR\ \&\fIPREFIX_DIR\fR
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.RS 4
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Apply changes to configuration files under the root filesystem found under the directory
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\fIPREFIX_DIR\fR\&. This option does not chroot and is intended for preparing a cross\-compilation target\&. Some limitations: NIS and LDAP users/groups are not verified\&. PAM authentication is using the host files\&. No SELINUX support\&.
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.RE
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.PP
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\fB\-s\fR, \fB\-\-shell\fR\ \&\fISHELL\fR
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.RS 4
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sets the path to the user\*(Aqs login shell\&. Without this option, the system will use the
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\fBSHELL\fR
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variable specified in
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/etc/default/useradd, or, if that is as well not set, the field for the login shell in
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/etc/passwd
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remains empty\&.
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.RE
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.PP
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\fB\-u\fR, \fB\-\-uid\fR\ \&\fIUID\fR
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.RS 4
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The numerical value of the user\*(Aqs ID\&. This value must be unique, unless the
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\fB\-o\fR
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option is used\&. The value must be non\-negative\&. The default is to use the smallest ID value greater than or equal to
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\fBUID_MIN\fR
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and greater than every other user\&.
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.sp
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See also the
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\fB\-r\fR
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option and the
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\fBUID_MAX\fR
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description\&.
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.RE
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.PP
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\fB\-U\fR, \fB\-\-user\-group\fR
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.RS 4
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Crea un gruppo con lo stesso nome dell\*(Aqutente e aggiunge l\*(Aqutente al gruppo stesso\&.
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.sp
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The default behavior (if the
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\fB\-g\fR,
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\fB\-N\fR, and
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\fB\-U\fR
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options are not specified) is defined by the
|
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\fBUSERGROUPS_ENAB\fR
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variable in
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/etc/login\&.defs\&.
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.RE
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.PP
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\fB\-Z\fR, \fB\-\-selinux\-user\fR\ \&\fISEUSER\fR
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.RS 4
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defines the SELinux user for the new account\&. Without this option, SELinux uses the default user\&. Note that the shadow system doesn\*(Aqt store the selinux\-user, it uses
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\fBsemanage\fR(8)
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for that\&.
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.RE
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.PP
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\fB\-\-selinux\-range\fR\ \&\fISERANGE\fR
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.RS 4
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defines the SELinux MLS range for the new account\&. Without this option, SELinux uses the default range\&. Note that the shadow system doesn\*(Aqt store the selinux\-range, it uses
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\fBsemanage\fR(8)
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for that\&.
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.sp
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This option is only valid if the
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\fB\-Z\fR
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(or
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\fB\-\-selinux\-user\fR) option is specified\&.
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.RE
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.SS "Cambiare i valori predefiniti"
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.PP
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When invoked with only the
|
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\fB\-D\fR
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option,
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\fBuseradd\fR
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will display the current default values\&. When invoked with
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\fB\-D\fR
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plus other options,
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\fBuseradd\fR
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will update the default values for the specified options\&. Valid default\-changing options are:
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.PP
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\fB\-b\fR, \fB\-\-base\-dir\fR\ \&\fIBASE_DIR\fR
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.RS 4
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sets the path prefix for a new user\*(Aqs home directory\&. The user\*(Aqs name will be affixed to the end of
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\fIBASE_DIR\fR
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to form the new user\*(Aqs home directory name, if the
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\fB\-d\fR
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option is not used when creating a new account\&.
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.sp
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|
This option sets the
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\fBHOME\fR
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variable in
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/etc/default/useradd\&.
|
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.RE
|
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.PP
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|
\fB\-e\fR, \fB\-\-expiredate\fR\ \&\fIEXPIRE_DATE\fR
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.RS 4
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sets the date on which newly created user accounts are disabled\&.
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.sp
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This option sets the
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\fBEXPIRE\fR
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variable in
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/etc/default/useradd\&.
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.RE
|
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.PP
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|
\fB\-f\fR, \fB\-\-inactive\fR\ \&\fIINACTIVE\fR
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.RS 4
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defines the number of days after the password exceeded its maximum age where the user is expected to replace this password\&. See
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\fBshadow\fR(5)for more information\&.
|
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.sp
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|
This option sets the
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\fBINACTIVE\fR
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|
variable in
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/etc/default/useradd\&.
|
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.RE
|
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.PP
|
|
\fB\-g\fR, \fB\-\-gid\fR\ \&\fIGROUP\fR
|
|
.RS 4
|
|
sets the default primary group for newly created users, accepting group names or a numerical group ID\&. The named group must exist, and the GID must have an existing entry\&.
|
|
.sp
|
|
This option sets the
|
|
\fBGROUP\fR
|
|
variable in
|
|
/etc/default/useradd\&.
|
|
.RE
|
|
.PP
|
|
\fB\-s\fR, \fB\-\-shell\fR\ \&\fISHELL\fR
|
|
.RS 4
|
|
defines the default login shell for new users\&.
|
|
.sp
|
|
This option sets the
|
|
\fBSHELL\fR
|
|
variable in
|
|
/etc/default/useradd\&.
|
|
.RE
|
|
.SH "NOTE"
|
|
.PP
|
|
The system administrator is responsible for placing the default user files in the
|
|
/etc/skel/
|
|
directory (or any other skeleton directory specified in
|
|
/etc/default/useradd
|
|
or on the command line)\&.
|
|
.SH "AVVISI/CAVEAT"
|
|
.PP
|
|
Non \(`e possibile aggiungere un utente ad un gruppo NIS o LDAP\&. Questo deve essere fatto sul server corrispondente\&.
|
|
.PP
|
|
Similarly, if the username already exists in an external user database such as NIS or LDAP,
|
|
\fBuseradd\fR
|
|
will deny the user account creation request\&.
|
|
.PP
|
|
Usernames may contain only lower and upper case letters, digits, underscores, or dashes\&. They can end with a dollar sign\&. Dashes are not allowed at the beginning of the username\&. Fully numeric usernames and usernames \&. or \&.\&. are also disallowed\&. It is not recommended to use usernames beginning with \&. character as their home directories will be hidden in the
|
|
\fBls\fR
|
|
output\&.
|
|
.PP
|
|
I nomi utente non possono eccedere i 256 caratteri di lunghezza\&.
|
|
.SH "CONFIGURAZIONE"
|
|
.PP
|
|
The following configuration variables in
|
|
/etc/login\&.defs
|
|
change the behavior of this tool:
|
|
.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/group
|
|
.RS 4
|
|
Informazioni sugli account di gruppo\&.
|
|
.RE
|
|
.PP
|
|
/etc/gshadow
|
|
.RS 4
|
|
Informazioni sicure sugli account di gruppo\&.
|
|
.RE
|
|
.PP
|
|
/etc/default/useradd
|
|
.RS 4
|
|
Valori predefiniti per la creazione dell\*(Aqaccount\&.
|
|
.RE
|
|
.PP
|
|
/etc/shadow\-maint/useradd\-pre\&.d/*, /etc/shadow\-maint/useradd\-post\&.d/*
|
|
.RS 4
|
|
Run\-part files to execute during user addition\&. The environment variable
|
|
\fBACTION\fR
|
|
will be populated with useradd and
|
|
\fBSUBJECT\fR
|
|
with the
|
|
\fBusername\fR\&.
|
|
useradd\-pre\&.d
|
|
will be executed prior to any user addition\&.
|
|
useradd\-post\&.d
|
|
will execute after user addition\&. If a script exits non\-zero then execution will terminate\&.
|
|
.RE
|
|
.PP
|
|
/etc/skel/
|
|
.RS 4
|
|
Directory contenente i file predefiniti\&.
|
|
.RE
|
|
.PP
|
|
/etc/subgid
|
|
.RS 4
|
|
Per user subordinate group IDs\&.
|
|
.RE
|
|
.PP
|
|
/etc/subuid
|
|
.RS 4
|
|
Per user subordinate user IDs\&.
|
|
.RE
|
|
.PP
|
|
/etc/login\&.defs
|
|
.RS 4
|
|
Configurazione del pacchetto password shadow
|
|
.RE
|
|
.SH "VALORI RESTITUITI"
|
|
.PP
|
|
The
|
|
\fBuseradd\fR
|
|
command exits with the following values:
|
|
.PP
|
|
\fI0\fR
|
|
.RS 4
|
|
success
|
|
.RE
|
|
.PP
|
|
\fI1\fR
|
|
.RS 4
|
|
can\*(Aqt update password file
|
|
.RE
|
|
.PP
|
|
\fI2\fR
|
|
.RS 4
|
|
invalid command syntax
|
|
.RE
|
|
.PP
|
|
\fI3\fR
|
|
.RS 4
|
|
invalid argument to option
|
|
.RE
|
|
.PP
|
|
\fI4\fR
|
|
.RS 4
|
|
UID already in use (and no
|
|
\fB\-o\fR)
|
|
.RE
|
|
.PP
|
|
\fI6\fR
|
|
.RS 4
|
|
specified group doesn\*(Aqt exist
|
|
.RE
|
|
.PP
|
|
\fI9\fR
|
|
.RS 4
|
|
username or group name already in use
|
|
.RE
|
|
.PP
|
|
\fI10\fR
|
|
.RS 4
|
|
can\*(Aqt update group file
|
|
.RE
|
|
.PP
|
|
\fI12\fR
|
|
.RS 4
|
|
can\*(Aqt create home directory
|
|
.RE
|
|
.PP
|
|
\fI14\fR
|
|
.RS 4
|
|
can\*(Aqt update SELinux user mapping
|
|
.RE
|
|
.PP
|
|
\fI19\fR
|
|
.RS 4
|
|
invalid user or group name
|
|
.RE
|
|
.SH "VEDERE ANCHE"
|
|
.PP
|
|
\fBchfn\fR(1),
|
|
\fBchsh\fR(1),
|
|
\fBpasswd\fR(1),
|
|
\fBcrypt\fR(3),
|
|
\fBgroupadd\fR(8),
|
|
\fBgroupdel\fR(8),
|
|
\fBgroupmod\fR(8),
|
|
\fBlogin.defs\fR(5),
|
|
\fBnewusers\fR(8),
|
|
\fBsubgid\fR(5), \fBsubuid\fR(5),
|
|
\fBuserdel\fR(8),
|
|
\fBusermod\fR(8)\&.
|