groupmod man page on ElementaryOS

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GROUPMOD(8)		  System Management Commands		   GROUPMOD(8)

       groupmod - modify a group definition on the system

       groupmod [options] GROUP

       The groupmod command modifies the definition of the specified GROUP by
       modifying the appropriate entry in the group database.

       The options which apply to the groupmod command are:

       -g, --gid GID
	   The group ID of the given GROUP will be changed to GID.

	   The value of GID must be a non-negative decimal integer. This value
	   must be unique, unless the -o option is used.

	   Users who use the group as primary group will be updated to keep
	   the group as their primary group.

	   Any files that have the old group ID and must continue to belong to
	   GROUP, must have their group ID changed manually.

	   No checks will be performed with regard to the GID_MIN, GID_MAX,
	   SYS_GID_MIN, or SYS_GID_MAX from /etc/login.defs.

       -h, --help
	   Display help message and exit.

       -n, --new-name NEW_GROUP
	   The name of the group will be changed from GROUP to NEW_GROUP name.

       -o, --non-unique
	   When used with the -g option, allow to change the group GID to a
	   non-unique value.

       -p, --password PASSWORD
	   The encrypted password, as returned by crypt(3).

	   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, --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:

       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.

	   Group account information.

	   Secure group account information.

	   Shadow password suite configuration.

	   User account information.

       The groupmod command exits with the following values:


	   invalid command syntax

	   invalid argument to option

	   specified group doesn't exist

	   specified group doesn't exist

	   group name already in use

	   can't update group file

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

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

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