NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SETUP | CONFIGURATION | FILES | SEE ALSO | COLOPHON
GROUPMEMS(8) System Management Commands GROUPMEMS(8)
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 (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.
/etc/group Group account information. /etc/gshadow secure group account information
chfn(1), chsh(1), passwd(1), groupadd(8), groupdel(8), useradd(8), userdel(8), usermod(8).
This page is part of the shadow-utils (utilities for managing accounts and shadow password files) project. Information about the project can be found at ⟨https://github.com/shadow-maint/shadow⟩. If you have a bug report for this manual page, send it to firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://github.com/shadow-maint/shadow⟩ on 2022-12-17. (At that time, the date of the most recent commit that was found in the repository was 2022-12-15.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com shadow-utils 4.11.1 12/17/2022 GROUPMEMS(8)