↩ 🔵 🔵 🔵 ❪✺❫ Unix Concepts ○ ❪✺₁₀❫ Operating System Classes ○ ❪✺₁;❫ Classes of Unix Files ○ File Descriptor ○꠹ Inode ○꠹ Pipeline ○꠹ᵁᴺᴵˣ Signal ○꠹ᵁᴺᴵˣ