GROUPMOD(8) System Management Commands GROUPMOD(8)

groupmod - ändert eine Gruppendefinition auf dem System


groupmod [options] GROUP

The groupmod command modifies the definition of the specified GROUP by modifying the appropriate entry in the group database.

The options which apply to the groupmod command are:

-a, --append GID

If group members are specified with -U, append them to the existing member list, rather than replacing it.

-g, --gid GID

The group ID of the given GROUP will be changed to GID.

The value of GID must be a non-negative decimal integer. This value must be unique, unless the -o option is used.

Bei Benutzern, für die die Gruppe die primäre Gruppe darstellt, wird der Eintrag aktualisiert, damit die Zuordnung zu dieser Gruppe erhalten bleibt.

Any files that have the old group ID and must continue to belong to GROUP, must have their group ID changed manually.

No checks will be performed with regard to the GID_MIN, GID_MAX, SYS_GID_MIN, or SYS_GID_MAX from /etc/login.defs.

-h, --help

zeigt die Hilfe an und beendet das Programm.

-n, --new-name NEW_GROUP

The name of the group will be changed from GROUP to NEW_GROUP name.

-o, --non-unique

When used with the -g option, allow to change the group GID to a non-unique value.

-p, --password PASSWORD

The encrypted password, as returned by crypt(3).

Note: This option is not recommended because the password (or encrypted password) will be visible by users listing the processes.

Sie sollten sicherstellen, dass das Passwort den Passwortrichtlinien des Systems entspricht.

-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 in the PREFIX_DIR directory and use the configuration files from the PREFIX_DIR 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.

-U, --users

A list of usernames to add as members of the group.

The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in /etc/login.defs.

The following configuration variables in /etc/login.defs change the behavior of this tool:


Informationen zu den Gruppenkonten


geschützte Informationen zu den Gruppenkonten


konfiguriert die Shadow-Hilfsprogramme.


Informationen zu den Benutzerkonten

The groupmod command exits with the following values:


E_SUCCESS: success


E_USAGE: invalid command syntax


E_BAD_ARG: invalid argument to option


E_GID_IN_USE: group id already in use


E_NOTFOUND: specified group doesn't exist


E_NAME_IN_USE: group name already in use


E_GRP_UPDATE: can't update group file


E_CLEANUP_SERVICE: can't setup cleanup service


E_PAM_USERNAME: can't determine your username for use with pam


E_PAM_ERROR: pam returned an error, see syslog facility id groupmod for the PAM error message

chfn(1), chsh(1), passwd(1), gpasswd(8), groupadd(8), groupdel(8), login.defs(5), useradd(8), userdel(8), usermod(8).

01.04.2024 shadow-utils 4.15.1