Provided by:
passwd_4.1.1-1ubuntu1_i386 
NOME
groupadd - Crea un nuovo gruppo
SINOSSI
groupadd [-g GID [-o]] [-f] [-K KEY=VALUE] group
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.
OPZIONI
Il comando groupadd accetta le seguenti opzioni:
-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
Il valore numerico dell´identificatore (ID) del gruppo. Questo
valore deve essere univoco, a meno che non venga usata l´opzione
-o. Il valore deve essere non-negativo. La scelta predefinita è
quella di usare il minimo valore di ID superiore a 999 e superiore
a qualunque altro gruppo. Valori tra 0 e 999 sono tipicamente
riservati per account di sistema.
-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
This option permits to add a group with a non-unique GID.
-p, --password PASSWORD
The encrypted password, as returned by crypt(3). The default is to
disable the password.
CONFIGURATION
The following configuration variables in /etc/login.defs change the
behavior of this tool:
GID_MAX (number), GID_MIN (number)
Range of group IDs used for the creation of regular groups by
useradd, useradd, or newusers.
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.
SYS_GID_MAX (number), SYS_GID_MIN (number)
Range of group IDs used for the creation of system groups by
useradd, groupadd, or newusers.
FILE
/etc/group
Informazioni sugli account di gruppo.
/etc/gshadow
Informazioni sicure sugli account di gruppo.
/etc/login.defs
Shadow password suite configuration.
AVVISI/CAVEAT
Groupnames must begin with a lower case letter or an underscore, and
only lower case letters, underscores, dashes, and dollar signs may
follow. In regular expression terms: [a-z_][a-z0-9_-]*[$]
Groupnames may only be up to 16 characters long.
You may not add a NIS or LDAP group. This must be performed on the
corresponding server.
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
successo
2
sintassi del comando errata
3
invalid argument to option
4
GID not unique (when -o not used)
9
group name not unique
10
non è possibile aggiornare il file group
VEDERE ANCHE
chfn(1), chsh(1), passwd(1), gpasswd(8), groupdel(8), groupmod(8),
login.defs(5), useradd(8), userdel(8), usermod(8).