Users & Permissions
Users, groups, chmod, chown, and sudo—the core of Linux access control.
1. Users and Groups
Understand Linux users, groups, UID, whoami, id, and /etc/passwd for access control.
15 min
+24 XP
2. File Permissions (chmod, chown)
Read rwx permissions in ls -l and change them with chmod and chown.
15 min
+24 XP
3. sudo & Root Access
Use sudo safely, understand root privileges, and why daily root login is risky.
15 min
+24 XP
4. Lab — Permission Challenge
Practice fixing script execute bits and locking down sensitive files with chmod.
25 min
+24 XP
5. Quiz — Permissions
10-question quiz on users, groups, permission modes, and sudo.
10 min
+24 XP