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

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		    06/24/2011				      GROUPMOD(8)


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