Provided by: passwd_4.1.4.2-1ubuntu2_i386 bug

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 systems 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 doesnt exist

       6
           specified group doesnt exist

       9
           group name already in use

       10
           cant update group file

SEE ALSO

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