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  4. groupmod(8)

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GROUPMOD(8) Comandi per la gestione del si GROUPMOD(8)

NOME

groupmod - modifica la definizione di un gruppo del sistema

SINOSSI

groupmod [opzioni] GRUPPO

DESCRIZIONE

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

OPZIONI

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.

Gli utenti che hanno il gruppo come gruppo primario verranno aggiornati per mantenere tale gruppo come loro gruppo primario.

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

Mostra un messaggio di aiuto ed esce.

-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.

Ci si deve accertare che la password rispetti le norme delle password del sistema.

-R, --root CHROOT_DIR

Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

-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.

CONFIGURAZIONE

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

FILE

/etc/group

Informazioni sugli account di gruppo.

/etc/gshadow

Informazioni sicure sugli account di gruppo.

/etc/login.defs

Configurazione del pacchetto password shadow

/etc/passwd

Informazioni sugli account utente.

VALORI RESTITUITI

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

VEDERE ANCHE

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

12/07/2023 shadow-utils 4.9