'\" t
.\"     Title: usermod
.\"    Author: Julianne Frances Haugh
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 26.05.2025
.\"    Manual: Befehle zur Systemverwaltung
.\"    Source: shadow-utils 4.9
.\"  Language: German
.\"
.TH "USERMOD" "8" "26.05.2025" "shadow\-utils 4\&.9" "Befehle zur Systemverwaltung"
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.SH "NAME"
usermod \- ver\(:andert ein Benutzerkonto
.SH "\(:UBERSICHT"
.HP \w'\fBusermod\fR\ 'u
\fBusermod\fR [\fIOptionen\fR] \fIANMELDENAME\fR
.SH "BESCHREIBUNG"
.PP
The
\fBusermod\fR
command modifies the system account files to reflect the changes that are specified on the command line\&.
.SH "OPTIONEN"
.PP
The options which apply to the
\fBusermod\fR
command are:
.PP
\fB\-a\fR, \fB\-\-append\fR
.RS 4
Add the user to the supplementary group(s)\&. Use only with the
\fB\-G\fR
option\&.
.RE
.PP
\fB\-b\fR, \fB\-\-badname\fR
.RS 4
Allow names that do not conform to standards\&.
.RE
.PP
\fB\-c\fR, \fB\-\-comment\fR\ \&\fICOMMENT\fR
.RS 4
The new value of the user\*(Aqs password file comment field\&. It is normally modified using the
\fBchfn\fR(1)
utility\&.
.RE
.PP
\fB\-d\fR, \fB\-\-home\fR\ \&\fIHOME_DIR\fR
.RS 4
das neue Home\-Verzeichnis des Benutzers
.sp
If the
\fB\-m\fR
option is given, the contents of the current home directory will be moved to the new home directory, which is created if it does not already exist\&. If the current home directory does not exist the new home directory will not be created\&.
.RE
.PP
\fB\-e\fR, \fB\-\-expiredate\fR\ \&\fIEXPIRE_DATE\fR
.RS 4
The date on which the user account will be disabled\&. The date is specified in the format
\fIYYYY\-MM\-DD\fR\&.
.sp
An empty
\fIEXPIRE_DATE\fR
argument will disable the expiration of the account\&.
.sp
This option requires a
/etc/shadow
file\&. A
/etc/shadow
entry will be created if there were none\&.
.RE
.PP
\fB\-f\fR, \fB\-\-inactive\fR\ \&\fIINACTIVE\fR
.RS 4
Die Anzahl von Tagen, nach denen ein Passwort abgelaufen ist, bis das Konto deaktiviert wird\&.
.sp
Ein Wert von 0 deaktiviert das Konto, sobald das Passwort abl\(:auft\&. Ein Wert von \-1 schaltet diese Funktion ab\&.
.sp
This option requires a
/etc/shadow
file\&. A
/etc/shadow
entry will be created if there were none\&.
.RE
.PP
\fB\-g\fR, \fB\-\-gid\fR\ \&\fIGROUP\fR
.RS 4
Der Name oder die Zahl der anf\(:anglichen Anmeldegruppe eines neuen Benutzers\&. Der Gruppenname muss existieren\&.
.sp
Jede Datei im Home\-Verzeichnis des Benutzers, die der alten Hauptgruppe des Benutzers geh\(:orte, wird dieser neuen Gruppe geh\(:oren\&.
.sp
Die Gruppenzugeh\(:origkeit von Dateien au\(sserhalb des Home\-Verzeichnisses des Benutzers muss per Hand angepasst werden\&.
.sp
The change of the group ownership of files inside of the user\*(Aqs home directory is also not done if the home dir owner uid is different from the current or new user id\&. This is a safety measure for special home directories such as
/\&.
.RE
.PP
\fB\-G\fR, \fB\-\-groups\fR\ \&\fIGROUP1\fR[\fI,GROUP2,\&.\&.\&.\fR[\fI,GROUPN\fR]]]
.RS 4
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
\fB\-g\fR
option\&.
.sp
If the user is currently a member of a group which is not listed, the user will be removed from the group\&. This behaviour can be changed via the
\fB\-a\fR
option, which appends the user to the current supplementary group list\&.
.RE
.PP
\fB\-l\fR, \fB\-\-login\fR\ \&\fINEW_LOGIN\fR
.RS 4
The name of the user will be changed from
\fILOGIN\fR
to
\fINEW_LOGIN\fR\&. Nothing else is changed\&. In particular, the user\*(Aqs home directory or mail spool should probably be renamed manually to reflect the new login name\&.
.RE
.PP
\fB\-L\fR, \fB\-\-lock\fR
.RS 4
Lock a user\*(Aqs password\&. This puts a \*(Aq!\*(Aq in front of the encrypted password, effectively disabling the password\&. You can\*(Aqt use this option with
\fB\-p\fR
or
\fB\-U\fR\&.
.sp
Note: if you wish to lock the account (not only access with a password), you should also set the
\fIEXPIRE_DATE\fR
to
\fI1\fR\&.
.RE
.PP
\fB\-m\fR, \fB\-\-move\-home\fR
.RS 4
Move the content of the user\*(Aqs home directory to the new location\&. If the current home directory does not exist the new home directory will not be created\&.
.sp
This option is only valid in combination with the
\fB\-d\fR
(or
\fB\-\-home\fR) option\&.
.sp
\fBusermod\fR
will try to adapt the ownership of the files and to copy the modes, ACL and extended attributes, but manual changes might be needed afterwards\&.
.RE
.PP
\fB\-o\fR, \fB\-\-non\-unique\fR
.RS 4
When used with the
\fB\-u\fR
option, this option allows to change the user ID to a non\-unique value\&.
.RE
.PP
\fB\-p\fR, \fB\-\-password\fR\ \&\fIPASSWORD\fR
.RS 4
The encrypted password, as returned by
\fBcrypt\fR(3)\&.
.sp
\fBNote:\fR
This option is not recommended because the password (or encrypted password) will be visible by users listing the processes\&.
.sp
Sie sollten sicherstellen, dass das Passwort den Passwortrichtlinien des Systems entspricht\&.
.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\-P\fR, \fB\-\-prefix\fR\ \&\fIPREFIX_DIR\fR
.RS 4
Apply changes in the
\fIPREFIX_DIR\fR
directory and use the configuration files from the
\fIPREFIX_DIR\fR
directory\&. 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\&.
.RE
.PP
\fB\-s\fR, \fB\-\-shell\fR\ \&\fISHELL\fR
.RS 4
Der Pfad der neuen Anmelde\-Shell des Benutzers\&. Falls dieses Feld leer gelassen wird, verwendet das System die Standard\-Anmelde\-Shell\&.
.RE
.PP
\fB\-u\fR, \fB\-\-uid\fR\ \&\fIUID\fR
.RS 4
der neue numerische Wert der UID des Benutzers
.sp
This value must be unique, unless the
\fB\-o\fR
option is used\&. The value must be non\-negative\&.
.sp
F\(:ur die Mailbox des Benutzers und alle Dateien, die ihm geh\(:oren und sich in seinem Home\-Verzeichnis befinden, wird die ID des Eigent\(:umers automatisch angepasst\&.
.sp
Der Eigent\(:umer von Dateien au\(sserhalb des Home\-Verzeichnisses des Benutzers muss per Hand angepasst werden\&.
.sp
The change of the user ownership of files inside of the user\*(Aqs home directory is also not done if the home dir owner uid is different from the current or new user id\&. This is a safety measure for special home directories such as
/\&.
.sp
No checks will be performed with regard to the
\fBUID_MIN\fR,
\fBUID_MAX\fR,
\fBSYS_UID_MIN\fR, or
\fBSYS_UID_MAX\fR
from
/etc/login\&.defs\&.
.RE
.PP
\fB\-U\fR, \fB\-\-unlock\fR
.RS 4
Unlock a user\*(Aqs password\&. This removes the \*(Aq!\*(Aq in front of the encrypted password\&. You can\*(Aqt use this option with
\fB\-p\fR
or
\fB\-L\fR\&.
.sp
Note: if you wish to unlock the account (not only access with a password), you should also set the
\fIEXPIRE_DATE\fR
(for example to
\fI99999\fR, or to the
\fBEXPIRE\fR
value from
/etc/default/useradd)\&.
.RE
.PP
\fB\-v\fR, \fB\-\-add\-subuids\fR\ \&\fIFIRST\fR\-\fILAST\fR
.RS 4
Add a range of subordinate uids to the user\*(Aqs account\&.
.sp
This option may be specified multiple times to add multiple ranges to a users account\&.
.sp
No checks will be performed with regard to
\fBSUB_UID_MIN\fR,
\fBSUB_UID_MAX\fR, or
\fBSUB_UID_COUNT\fR
from /etc/login\&.defs\&.
.RE
.PP
\fB\-V\fR, \fB\-\-del\-subuids\fR\ \&\fIFIRST\fR\-\fILAST\fR
.RS 4
Remove a range of subordinate uids from the user\*(Aqs account\&.
.sp
This option may be specified multiple times to remove multiple ranges to a users account\&. When both
\fB\-\-del\-subuids\fR
and
\fB\-\-add\-subuids\fR
are specified, the removal of all subordinate uid ranges happens before any subordinate uid range is added\&.
.sp
No checks will be performed with regard to
\fBSUB_UID_MIN\fR,
\fBSUB_UID_MAX\fR, or
\fBSUB_UID_COUNT\fR
from /etc/login\&.defs\&.
.RE
.PP
\fB\-w\fR, \fB\-\-add\-subgids\fR\ \&\fIFIRST\fR\-\fILAST\fR
.RS 4
Add a range of subordinate gids to the user\*(Aqs account\&.
.sp
This option may be specified multiple times to add multiple ranges to a users account\&.
.sp
No checks will be performed with regard to
\fBSUB_GID_MIN\fR,
\fBSUB_GID_MAX\fR, or
\fBSUB_GID_COUNT\fR
from /etc/login\&.defs\&.
.RE
.PP
\fB\-W\fR, \fB\-\-del\-subgids\fR\ \&\fIFIRST\fR\-\fILAST\fR
.RS 4
Remove a range of subordinate gids from the user\*(Aqs account\&.
.sp
This option may be specified multiple times to remove multiple ranges to a users account\&. When both
\fB\-\-del\-subgids\fR
and
\fB\-\-add\-subgids\fR
are specified, the removal of all subordinate gid ranges happens before any subordinate gid range is added\&.
.sp
No checks will be performed with regard to
\fBSUB_GID_MIN\fR,
\fBSUB_GID_MAX\fR, or
\fBSUB_GID_COUNT\fR
from /etc/login\&.defs\&.
.RE
.PP
\fB\-Z\fR, \fB\-\-selinux\-user\fR\ \&\fISEUSER\fR
.RS 4
der neue SELinux\-Benutzer f\(:ur den Anmeldenamen des Benutzers
.sp
A blank
\fISEUSER\fR
will remove the SELinux user mapping for user
\fILOGIN\fR
(if any)\&.
.RE
.SH "WARNUNGEN"
.PP
You must make certain that the named user is not executing any processes when this command is being executed if the user\*(Aqs numerical user ID, the user\*(Aqs name, or the user\*(Aqs home directory is being changed\&.
\fBusermod\fR
checks this on Linux\&. On other platforms it only uses utmp to check if the user is logged in\&.
.PP
You must change the owner of any
\fBcrontab\fR
files or
\fBat\fR
jobs manually\&.
.PP
Sie m\(:ussen alle \(:Anderung in Bezug auf NIS auf dem NIS\-Server vornehmen\&.
.SH "KONFIGURATION"
.PP
The following configuration variables in
/etc/login\&.defs
change the behavior of this tool:
.SH "DATEIEN"
.PP
/etc/group
.RS 4
Informationen zu den Gruppenkonten
.RE
.PP
/etc/gshadow
.RS 4
sichere Informationen zu den Gruppenkonten
.RE
.PP
/etc/login\&.defs
.RS 4
Konfiguration der Shadow\-Passwort\-Werkzeugsammlung
.RE
.PP
/etc/passwd
.RS 4
Informationen zu den Benutzerkonten
.RE
.PP
/etc/shadow
.RS 4
verschl\(:usselte Informationen zu den Benutzerkonten
.RE
.PP
/etc/subgid
.RS 4
Per user subordinate group IDs\&.
.RE
.PP
/etc/subuid
.RS 4
Per user subordinate user IDs\&.
.RE
.SH "SIEHE AUCH"
.PP
\fBchfn\fR(1),
\fBchsh\fR(1),
\fBpasswd\fR(1),
\fBcrypt\fR(3),
\fBgpasswd\fR(8),
\fBgroupadd\fR(8),
\fBgroupdel\fR(8),
\fBgroupmod\fR(8),
\fBlogin.defs\fR(5),
\fBsubgid\fR(5), \fBsubuid\fR(5),
\fBuseradd\fR(8),
\fBuserdel\fR(8)\&.
