GROUPMOD(8)

NAME
groupmod - ändert eine Gruppendefinition auf dem System

ÜBERSICHT

groupmod [options] GROUP

BESCHREIBUNG

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

OPTIONEN

The options which apply to the groupmod command are:

-a, --append
    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 comma-separated list of usernames to add as members of the group.

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

KONFIGURATION

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

MAX_MEMBERS_PER_GROUP (number)
    Maximum members per group entry. When the maximum is reached, a new group entry (line) is started in /etc/group (with the same name, same password, and same GID).

    The default value is 0, meaning that there are no limits in the number of members in a group.

    This feature (split group) permits to limit the length of lines in the group file. This is useful to make sure that lines for NIS groups are not larger than 1024 characters.

    If you need to enforce such limit, you can use 25.

    Note: split groups may not be supported by all tools (even in the Shadow toolsuite). You should not use this variable unless you really need it.

DATEIEN

/etc/group
    Informationen zu den Gruppenkonten

/etc/gshadow
    geschützte Informationen zu den Gruppenkonten

/etc/login.defs
    konfiguriert die Shadow-Hilfsprogramme.

/etc/passwd
    Informationen zu den Benutzerkonten

RÜCKGABEWERTE

The groupmod command exits with the following values:

0
    E_SUCCESS: success

2
    E_USAGE: invalid command syntax

3
    E_BAD_ARG: invalid argument to option

4
    E_GID_IN_USE: group id already in use

6
    E_NOTFOUND: specified group doesn't exist

9
    E_NAME_IN_USE: group name already in use

10
    E_GRP_UPDATE: can't update group file

11
    E_CLEANUP_SERVICE: can't setup cleanup service

12
    E_PAM_USERNAME: can't determine your username for use with pam

13
    E_PAM_ERROR: pam returned an error, see syslog facility id groupmod for the PAM error message

SIEHE AUCH

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