]> George Kraft IV Creation, 2000 Thomas Kłoczko kloczek@pld.org.pl shadow-utils maintainer, 2000 - 2007 Nicolas François nicolas.francois@centraliens.net shadow-utils maintainer, 2007 - now groupmems 8 System Management Commands shadow-utils &SHADOW_UTILS_VERSION; groupmems administer members of a user's primary group groupmems -a user_name -d user_name -g group_name -l -p The groupmems command allows a user to administer their 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. The options which apply to the groupmems command are: -a, --add user_name Add a 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. Only absolute paths are supported. The groupmems executable should be in mode 2710 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 2710 groupmems $ chown root.groups groupmems $ groupmems -g groups -a gk4 The following configuration variables in /etc/login.defs change the behavior of this tool: &MAX_MEMBERS_PER_GROUP; /etc/group Group account information. /etc/gshadow secure group account information chfn1 , chsh1 , passwd1 , groupadd8 , groupdel8 , useradd8 , userdel8 , usermod8 .