↩ 🔵 🔵 🔵 ❪֎₁❫ Commands ○ ❪֎₁₀❫ Operating System Commands ○ ❪֎₁₀❫ Programming Language Commands ○ ❪֎₁₀❫ Special-Purpose Commands ○ ❪֎₁₀❫ Utility Commands ○