Linux uses a multi-user system built on a structure of users, groups, and permissions to control access and enhance security. 🔹 User Represents an individual account Each user has a username, user ID (UID), and home directory 🔸 Group A collection of users Used to apply permissions collectively Users can belong to multiple groups 🔐 Permissions Every file/directory has three permission sets: Owner (User) Group Others (Everyone else) Permissions include: r – read w – write x – execute Example: -rw-r--r-- Owner can read/write Group can read Others can read 🔧 Use ls -l, chmod, chown, and chgrp to view and manage them. #LinuxBasics #UserPermission #SysAdmin #dLibroLinux