{"id":"group-management-usermod-groupadd","text":"groupadd creates groups, groupdel removes them. usermod -aG adds user to supplementary group (without -a it replaces all groups). groups and id show group memberships. /etc/group stores group data.","truth_value":"IN","source":"repo:entries/2026/03/04/group-management.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"group-management-usermod-groupadd","truth_value":"IN","reason":"premise"}]}}