↩ 🔵 🔵 🔵 ❪✺₀❫ Operating System Concepts ○ Unix ○› ❪✺❫ GNU Concepts ○ ❪✺❫ Linux Concepts ○ ❪✺₁❫ Unix Classes ○ ❪✺₃❫ Unix Particulars ○ ❪✺₄❫ Unix Sets ○ ❪✺_❫ Unix Subs ○ ❪✺-❫ Floating Concepts — Unix ○ Unix Filesystem ○