Provided by: passwd_4.15.3-3ubuntu2_amd64 
NAME
usermod - verändert ein Benutzerkonto
ÜBERSICHT
usermod [options] LOGIN
BESCHREIBUNG
The usermod command modifies the system account files.
OPTIONEN
The options which apply to the usermod command are:
-a, --append
Add the user to the supplementary group(s). Use only with the -G option.
-b, --badname
erlaube Namen, die nicht den Standards entsprechen.
-c, --comment COMMENT
update the comment field of the user in /etc/passwd, which is normally modified using
the chfn(1) utility.
-d, --home HOME_DIR
ändert das persönliche Verzeichnis des Benutzers
If the -m 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.
-e, --expiredate EXPIRE_DATE
The date on which the user account will be disabled. The date is specified in the
format YYYY-MM-DD. Integers as input are interpreted as days after 1970-01-01.
An input of -1 or an empty string will blank the account expiration field in the
shadow password file. The account will remain available with no date limit.
This option requires a /etc/shadow file. A /etc/shadow entry will be created if there
were none.
-f, --inactive INACTIVE
defines the number of days after the password exceeded its maximum age during which
the user may still login by immediately replacing the password. This grace period
before the account becomes inactive 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 shadow(5) for more information.
This option requires a /etc/shadow file. A /etc/shadow entry will be created if there
were none.
-g, --gid GROUP
The name or numerical ID of the user's new primary group. The group must exist.
Im persönlichen Verzeichnis des Benutzers werden alle Dateien, die der alten primären
Gruppe zugeordnet waren, auf diese Gruppe übertragen.
Die Gruppenzugehörigkeit von Dateien außerhalb des persönlichen Verzeichnisses des
Benutzers muss per Hand angepasst werden.
The change of the group ownership of files inside of the user's 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 /.
-G, --groups GROUP1[,GROUP2,...[,GROUPN]]]
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 must
exist.
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 -a option, which appends
the user to the current supplementary group list.
-l, --login NEW_LOGIN
The name of the user will be changed from LOGIN to NEW_LOGIN. Nothing else is changed.
In particular, the user's home directory or mail spool should probably be renamed
manually to reflect the new login name.
-L, --lock
Lock a user's password. This puts a '!' in front of the encrypted password,
effectively disabling the password. You can't use this option with -p or -U.
Note: if you wish to lock the account (not only access with a password), you should
also set the EXPIRE_DATE to 1.
-m, --move-home
moves the content of the user's home directory to the new location. If the current
home directory does not exist the new home directory will not be created.
This option is only valid in combination with the -d (or --home) option.
usermod 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.
-o, --non-unique
allows to change the user ID to a non-unique value.
This option is only valid in combination with the -u 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's behavior on the other hand, more than one login
name will access the account of the given UID.
-p, --password PASSWORD
defines a new password for the user. PASSWORD is expected to be encrypted, as returned
by crypt (3).
Note: Avoid this option on the command line because the password (or encrypted
password) will be visible by users listing the processes.
The password will be written in the local /etc/passwd or /etc/shadow file. This might
differ from the password database configured in your PAM configuration.
Sie sollten sicherstellen, dass das Passwort den Passwortrichtlinien des Systems
entspricht.
-r, --remove
Remove the user from named supplementary group(s). Use only with the -G option.
-R, --root CHROOT_DIR
Apply changes in the CHROOT_DIR directory and use the configuration files from the
CHROOT_DIR directory. Only absolute paths are supported.
-P, --prefix PREFIX_DIR
Apply changes within the directory tree starting with PREFIX_DIR and use as well the
configuration files located there. 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.
-s, --shell SHELL
changes the user's login shell. An empty string for SHELL blanks the field in
/etc/passwd and logs the user into the system's default shell.
-u, --uid UID
The new value of the user's ID.
This value must be unique, unless the -o option is used. The value must be
non-negative.
Für das Postfach des Benutzers und alle Dateien, die ihm gehören und sich in seinem
persönlichen Verzeichnis befinden, wird die Eigentümerkennung automatisch angepasst.
Der Eigentümer von Dateien außerhalb des persönlichen Verzeichnisses des Benutzers
muss per Hand angepasst werden.
The change of the user ownership of files inside of the user's 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 /.
No checks will be performed with regard to the UID_MIN, UID_MAX, SYS_UID_MIN, or
SYS_UID_MAX from /etc/login.defs.
-U, --unlock
Unlock a user's password. This removes the '!' in front of the encrypted password. You
can't use this option with -p or -L.
Note: if you wish to unlock the account (not only access with a password), you should
also set the EXPIRE_DATE (for example to 99999, or to the EXPIRE value from
/etc/default/useradd).
-v, --add-subuids FIRST-LAST
fügt dem Konto des Benutzers einen Bereich untergeordneter Benutzerkennungen zu.
This option may be specified multiple times to add multiple ranges to a user's
account.
No checks will be performed with regard to SUB_UID_MIN, SUB_UID_MAX, or SUB_UID_COUNT
from /etc/login.defs.
-V, --del-subuids FIRST-LAST
entfernt aus dem Benutzerkonto einen Bereich untergeordneter Benutzerkennungen.
This option may be specified multiple times to remove multiple ranges to a user's
account. When both --del-subuids and --add-subuids are specified, the removal of all
subordinate uid ranges happens before any subordinate uid range is added.
No checks will be performed with regard to SUB_UID_MIN, SUB_UID_MAX, or SUB_UID_COUNT
from /etc/login.defs.
-w, --add-subgids FIRST-LAST
fügt dem Benutzerkonto einen Bereich untergeordneter Gruppenkennungen zu.
This option may be specified multiple times to add multiple ranges to a user's
account.
No checks will be performed with regard to SUB_GID_MIN, SUB_GID_MAX, or SUB_GID_COUNT
from /etc/login.defs.
-W, --del-subgids FIRST-LAST
entfernt einen Bereich untergeordneter Gruppenkennungen aus dem Benutzerkonto.
This option may be specified multiple times to remove multiple ranges to a user's
account. When both --del-subgids and --add-subgids are specified, the removal of all
subordinate gid ranges happens before any subordinate gid range is added.
No checks will be performed with regard to SUB_GID_MIN, SUB_GID_MAX, or SUB_GID_COUNT
from /etc/login.defs.
-Z, --selinux-user SEUSER
defines the SELinux user to be mapped with LOGIN. An empty string ("") will remove the
respective entry (if any). Note that the shadow system doesn't store the selinux-user,
it uses semanage(8) for that.
--selinux-range SERANGE
defines the SELinux MLS range for the new account. Note that the shadow system doesn't
store the selinux-range, it uses semanage(8) for that.
This option is only valid if the -Z (or --selinux-user) option is specified.
WARNUNGEN
You must make certain that the named user is not executing any processes when this command
is being executed if the user's numerical user ID, the user's name, or the user's home
directory is being changed. usermod checks this on Linux. On other operating systems it
only uses utmp to check if the user is logged in.
You must change the owner of any crontab files or at jobs manually.
Sie müssen alle Änderungen, an welchen NIS beteiligt ist, auf dem NIS-Server vornehmen.
KONFIGURATION
The following configuration variables in /etc/login.defs change the behavior of this tool:
DATEIEN
/etc/group
Group account information
/etc/gshadow
Secure group account information
/etc/login.defs
Shadow password suite configuration
/etc/passwd
User account information
/etc/shadow
Secure user account information
/etc/subgid
Per user subordinate group IDs
/etc/subuid
Per user subordinate user IDs
SIEHE AUCH
chfn(1), chsh(1), passwd(1), crypt(3), gpasswd(8), groupadd(8), groupdel(8), groupmod(8),
login.defs(5), subgid(5), subuid(5), useradd(8), userdel(8).