00434nam a2200169Ia 4500008004100000020001500041082001800056100002100074245004000095260003900135300000800174650001600182650001400198653002100212653002200233653000900255170901s1990    xx            000 0 und d  a8177587706  a001.642bB12D  aBach, Maurice J. 0aDesign of The Unix Operating System  aNew DelhibPearson Educationc1990  a481  aGneralities  aKnowledge  aComputer systems  aOperating systems  aUNIX