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  4. groupadd(8)

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GROUPADD(8) Systemhanteringskommandon GROUPADD(8)

NAMN

groupadd - skapa en ny grupp

SYNOPSIS

groupadd [flaggor] grupp

BESKRIVNING

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.

FLAGGOR

Flaggorna som gäller för kommandot groupadd är:

-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, --gidGID

The numerical value of the group´s ID. This value 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

Visa hjälpmeddelande och avsluta.

-K, --keyNYCKEL=VÄRDE

Åsidosätter standardvärden i /etc/login.defs (GID_MIN, GID_MAX och andra). Flera flaggor av -K kan anges.

Example: -K GID_MIN=100 -K GID_MAX=499

Notera: -K GID_MIN=10,GID_MAX=499 fungerar ännu inte.

-o, --non-unique

This option permits to add a group with a non-unique GID.

-p, --passwordLÖSENORD

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 system´s password policy.

-r, --system

Create a system group.

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.

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.

The default value for GID_MIN (resp. GID_MAX) is 500 (resp. 60000).

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.

The default value for SYS_GID_MIN (resp. SYS_GID_MAX) is 201 (resp. GID_MIN-1).

FILER

/etc/group

Gruppkontoinformation.

/etc/gshadow

Säker gruppkontoinformation.

/etc/login.defs

Shadow password suite configuration.

TÄNK PÅ

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.

AVSLUTNINGSVÄRDEN

Kommandot groupadd avslutas med följande värden:

0

lyckad

2

ogiltig kommandosyntax

3

ogiltigt argument till flagga

4

GID inte unikt (när -o inte används)

9

gruppnamn inte unikt

10

kan inte uppdatera gruppfilen

SE OCKSÅ

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

11-05-2016 shadow-utils 4.1.5.1