00290nam a2200109 a 450000500170000002000150001708200180003210000210005024500400007126000440011130000250015520251203110655.0  a8120305167  a005.432UbBAC  aBach, Maurice J.  aDesign of the Unix Operating System  aNew DelhibPrentice Hall of Indiac2004  axiv,471p.c24 cm. PB