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groupadd - Unix, Linux Command

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NAME

groupadd - create a new group

SYNOPSIS

TagDescription
groupadd [-g gid [-o]] [-r] [-f] [-K KEY=VALUE] group

DESCRIPTION

The groupadd command creates a new group account using the values specified on the command line and the default values from the system. The new group will be entered into the system files as needed.

OPTIONS

The options which apply to the groupadd command are:

TagDescription
-f This option causes to just exit with success status if the specified group already exists. With -g, if specified GID already exists, other (unique) GID is chosen (i.e. -g is turned off).
-r This flag instructs groupadd to add a system account. The first available gid lower than 499 will be automatically selected unless the -g option is also given on the command line. This is an option added by Red Hat.
-g GID
  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 500 and greater than every other group. Values between 0 and 499 are typically reserved for system accounts.
-h, --help
  Display help message and exit.
-K 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 This option permits to add group with non-unique GID.

FILES

TagDescription
/etc/group
  Group account information.
/etc/gshadow
  Secure group account information.
/etc/login.defs
  Shadow password suite configuration.

CAVEATS

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.

If the groupname already exists in an external group database such as NIS, groupadd will deny the group creation request.

Groupnames may only be up to 16 characters long.

EXIT VALUES

The groupadd command exits with the following values:

TagDescription
0 success
2 invalid command syntax
3 invalid argument to option
4 GID not unique (when -o not used)
9 group name not unique
10 can’t update group file

SEE ALSO

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