• initial group vs additional groups
• /etc/group, /etc/passwd record group membership
• format of /etc/group: groupname:x:GID:user1,user2
• format of /etc/gshadow: groupname:password:admin,admin:member,member
• groupadd for adding new groups
• don't use groupmod -- use vigr instead.
• groupdel deletes non-primary gorups

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