GROUPADD(8) Comandi per la gestione del si GROUPADD(8)
NOME
groupadd - crea un nuovo gruppo
SINOSSI
groupadd [OPZIONI] NEWGROUP
DESCRIZIONE
The groupadd command creates a new group account using the values
specified on the command line plus the default values from the system.
The new group will be entered into the system files as needed.
Groupnames may contain only lower and upper case letters, digits,
underscores, or dashes. They can end with a dollar sign. Dashes are not
allowed at the beginning of the groupname. Fully numeric groupnames and
groupnames . or .. are also disallowed.
On Debian, the only constraints are that groupnames must neither start
with a dash ('-') nor plus ('+') nor tilde ('~') nor contain a colon
(':'), a comma (','), or a whitespace (space:' ', end of line: '\n',
tabulation: '\t', etc.).
Groupnames may only be up to 32 characters long.
OPZIONI
The options which apply to the groupadd command are:
-f, --force
This option causes the command to simply exit with success status
if the specified group already exists. When used with -g, and the
specified GID already exists, another (unique) GID is chosen (i.e.
-g is turned off).
-g, --gid GID
The numerical value of the group's ID. GID must be unique, unless
the -o option is used. The value must be non-negative. The default
is to use the smallest ID value greater than or equal to GID_MIN
and greater than every other group.
See also the -r option and the GID_MAX description.
-h, --help
Mostra un messaggio di aiuto ed esce.
-K, --key KEY=VALUE
Overrides /etc/login.defs defaults (GID_MIN, GID_MAX and others).
Multiple -K options can be specified.
Example: -K GID_MIN=100 -K GID_MAX=499
Note: -K GID_MIN=10,GID_MAX=499 doesn't work yet.
-o, --non-unique
permits the creation of a group with an already used numerical ID.
As a result, for this GID, the mapping towards group NEWGROUP may
not be unique.
-p, --password PASSWORD
defines an initial password for the group account. PASSWORD is
expected to be encrypted, as returned by crypt (3).
Without this option, the group account will be locked and with no
password defined, i.e. a single exclamation mark in the respective
field of ths system account file /etc/group or /etc/gshadow.
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, --system
Crea un gruppo di sistema.
The numeric identifiers of new system groups are chosen in the
SYS_GID_MIN-SYS_GID_MAX range, defined in login.defs, instead of
GID_MIN-GID_MAX.
-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 to configuration files under the root filesystem
found under the directory PREFIX_DIR. 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
AVVISI/CAVEAT
Non รจ possibile aggiungere un gruppo NIS o LDAP. Questo deve essere
fatto sul server corrispondente.
If the groupname already exists in an external group database such as
NIS or LDAP, groupadd will deny the group creation request.
VALORI RESTITUITI
The groupadd command exits with the following values:
0
success
2
invalid command syntax
3
invalid argument to option
4
GID is already used (when called without -o)
9
group name is already used
10
can't update group file
VEDERE ANCHE
chfn(1), chsh(1), passwd(1), gpasswd(8), groupdel(8), groupmod(8),
login.defs(5), useradd(8), userdel(8), usermod(8).
shadow-utils 4.13 23/03/2023 GROUPADD(8)
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