File Permission
Domain: Computer Systems
🎯 Motivation
Who can read, write, or execute a file. Three levels: owner, group, everyone.
📋 Concrete Example
Permissions: rwxr-xr—. Owner: read/write/execute. Group: read/execute. Others: read only. ‘chmod +x script.sh’ adds execute permission for everyone.
🔗 Analogy
File permissions are like access levels in a school - the principal (owner) can enter any room, teachers (group) can enter classrooms, students (others) can only enter common areas.