usermod
usermod - verändert ein Benutzerkonto
Beschreibung
The usermod command modifies the system account files.
Installation
- Debian Paket passwd
- sollte in jeder Linux-Installation vorhanden sein
sudo apt install passwd
- shadow-utils 4.16.0
- 05.08.2024
- USERMOD(8)
Anwendung
Benutzer umbenennen
Benutzer anton in zander umbenennen
sudo usermod -l zander anton
Home-Verzeichnis ändern
Benutzer berta in das neue Heimatverzeichnis /earth2/admins/berta umziehen
sudo usermod -d /earth2/admins/berta -m berta
Benutzer sperren
Benutzer chris sperren
sudo usermod -L chris
Loginshell ändern
Shell für diana auf /bin/fish setzen
sudo usermod -s /bin/fish diana
Benutzer/Gruppen-ID ändern
Benutzer ID und Gruppen ID von z. B. 1003 in 1000 ändern
sudo pgrep -U else|xargs kill -9
sudo usermod -u 1000 else
sudo groupmod -g 1000 else
Benutzer in Gruppe aufnehmen
Benutzer www-data in die Gruppe redis aufnehmen
# usermod -a -G redis www-data
Benutzer else in die Gruppe sudo aufnehmen (alle anderen Gruppenzugehörigkeiten von else bleiben erhalten)
sudo usermod -aG sudo else
Syntax
sudo usermod [Optionen] LOGIN
Optionen
Unix | GNU | Parameter | Beschreibung |
---|---|---|---|
-a | Benutzer zur Gruppen hinzufügen, die mit der Option -G angegeben werden, ohne ihn dabei aus anderen Gruppen zu entfernen.
| ||
-c | Kommentar | (neues) Kommentarfeld des Benutzers in der Passwort-Datei | |
-d | Heimverzeichnis [-m] |
Das neue Heimatverzeichnis des Benutzers.
| |
-e | Erlöschungsdatum | Datum, bis zu dem das Benutzerkonto gültig sein soll.
| |
-f | Inaktive Tage | Die Anzahl der Tage, die vergehen bis das Konto permanent erlischt, nachdem das zugehörige Passwort abgelaufen ist.
| |
-g | Initial-Gruppe | Der Name oder die Nummer der Gruppe, der der Benutzer zu Beginn zugewiesen sein soll.
| |
-G | Gruppe,[...] | Liste von zusätzlichen Gruppen, denen der Benutzer neben der Initial-Gruppe zugeordnet werden soll.
| |
-l | NEUER_NAME | Der Name des Benutzers wird von seinem alten Namen (login) in NEUER_NAME geändert | |
-p | passwd | Das verschlüsselte Passwort, wie es von crypt zurückgeliefert wird.
| |
-s | shell | Der Name der Login-Shell für den Benutzer.
| |
-u | uid | Der numerische Wert der Benutzer ID.
| |
-L | Das Passwort des Benutzers blockieren (Zugang sperren)
Diese Option darf nicht zusammen mit -p oder -U angegeben werden | ||
-U | Passwort, dass mit -L blockiert wurde wieder freigeben
Diese Option darf nicht zusammen mit -p oder -L verwendet werden |
- Achtung
- Wenn man die Option -G ohne die Option -a verwendet, so wird der entsprechende User den Gruppen hinzugefügt, welche als Liste übergeben werden, und aus allen anderen entfernt!
- Daher muss man, falls man den User einer Gruppe hinzufügen will, ohne die anderen Gruppenzugehörigkeiten anzutasten, die Optionen -a und -G immer zusammen verwenden, da man sich ansonsten z. B. auch aus der Gruppe admin entfernen könnte (die benötigt wird, um sich Root-Rechte verschaffen zu können)
Parameter
Umgebungsvariablen
Exit-Status
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 |
Anhang
Siehe auch
Dokumentation
Man-Page
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)
Info-Pages
Links
Projekt
Weblinks
TMP
USERMOD(8) System Management Commands USERMOD(8)
OPTIONEN
-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.