GROUPMOD(8)		  System Management Commands		   GROUPMOD(8)



NAME
       groupmod - modify a group definition on the system

SYNOPSIS
       groupmod [options] GROUP

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

OPTIONS
       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. Values between 0 and
	   999 are typically reserved for system groups.

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

       -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
	   policy.

CONFIGURATION
       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.

FILES
       /etc/group
	   Group account information.

       /etc/gshadow
	   Secure group account information.

EXIT VALUES
       The groupmod command exits with the following values:

       0
	   success

       2
	   invalid command syntax

       3
	   invalid argument to option

       4
	   specified group doesn't exist

       6
	   specified group doesn't exist

       9
	   group name already in use

       10
	   can't update group file

SEE ALSO
       chfn(1), chsh(1), passwd(1), gpasswd(8), groupadd(8), groupdel(8),
       useradd(8), userdel(8), usermod(8).



System Management Commands	  07/24/2009			   GROUPMOD(8)