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Linux 2.6 - man page for groupadd (linux section 8)

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 999 and greater than every other group. Values between 0 and 999 are
	   typically reserved for system accounts.

       -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

	   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.

       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

       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

	   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

	   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

	   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 contain a colon (':') or a whitespace (space:' ', end of line: '\n', tabulation: '\t',

       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).

System Management Commands		    06/24/2011				      GROUPADD(8)

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