groupadd man page on ElementaryOS

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GROUPADD(8)		  System Management Commands		   GROUPADD(8)

       groupadd - create a new group

       groupadd [options] group

       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.

       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. 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
	   Display help message and exit.

       -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.

	   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

       -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

       -R, --root CHROOT_DIR
	   Apply changes in the CHROOT_DIR directory and use the configuration
	   files from the CHROOT_DIR directory.

       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 1000 (resp.

       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 101
	   (resp.  GID_MIN-1).

	   Group account information.

	   Secure group account information.

	   Shadow password suite configuration.

       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 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.

       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.

       The groupadd command exits with the following values:


	   invalid command syntax

	   invalid argument to option

	   GID not unique (when -o not used)

	   group name not unique

	   can't update group file

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

shadow-utils		  02/17/2014			   GROUPADD(8)

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