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GROUPMEMS(8)              System Management Commands              GROUPMEMS(8)



NAME
       groupmems - administer members of a user?s primary group

SYNOPSIS
       groupmems -a user_name | -d user_name | [-g group_name] | -l | -p

DESCRIPTION
       The groupmems command allows a user to administer his/her own group membership list without the requirement of
       superuser privileges. The groupmems utility is for systems that configure its users to be in their own name
       sake primary group (i.e., guest / guest).

       Only the superuser, as administrator, can use groupmems to alter the memberships of other groups.

OPTIONS
       The options which apply to the groupmems command are:

       -a, --add user_name
           Add an user to the group membership list.

           If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a new entry will be
           created.

       -d, --delete user_name
           Delete a user from the group membership list.

           If the /etc/gshadow file exist, the user will be removed from the list of members and administrators of the
           group.

           If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a new entry will be
           created.

       -g, --group group_name
           The superuser can specify which group membership list to modify.

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

       -l, --list
           List the group membership list.

       -p, --purge
           Purge all users from the group membership list.

           If the /etc/gshadow file exist, and the group has no entry in the /etc/gshadow file, a new entry will be
           created.

       -R, --root CHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

SETUP
       The groupmems executable should be in mode 2770 as user root and in group groups. The system administrator can
       add users to group groups to allow or disallow them using the groupmems utility to manage their own group
       membership list.

                $ groupadd -r groups
                $ chmod 2770 groupmems
                $ chown root.groups groupmems
                $ groupmems -g groups -a gk4


       In the Red Hat Enterprise Linux 6 the groupmems command is not setuid and regular users cannot use it to
       manipulate the membership of their own group. This might change in future major releases of the Red Hat
       Enterprise Linux.

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

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



shadow-utils 4.1.5.1              05/10/2016                      GROUPMEMS(8)