Provided by: passwd_4.1.4.2-1ubuntu2_i386 bug

NOME

       groupadd - Crea un nuovo gruppo

SINOSSI

       groupadd [opzioni] 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 dellidentificatore (ID) del gruppo. Questo
           valore deve essere univoco, a meno che non venga usata lopzione -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 doesnt 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.

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

           You should make sure the password respects the systems password
           policy.

       -r, --system
           Create a system group.

           The numeric identifiers of new system groups are choosen in the
           SYS_GID_MIN-SYS_GID_MAX range, defined in login.defs, instead of
           GID_MIN-GID_MAX.

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, groupadd, 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

       It is usually recommended to only use groupnames that begin with a
       lower case letter or an underscore, followed by lower case letters,
       digits, underscores, or dashes. They can end with a dollar sign. In
       regular expression terms: [a-z_][a-z0-9_-]*[$]?

       On Debian, the only constraints are that groupnames must neither start
       with a dash (-) nor contain a colon (:) or a whitespace (space: , end
       of line: \n, tabulation: \t, etc.).

       Groupnames may only be up to 32 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).