00383nam a2200169 a 450000500170000002000180001708200180003510000210005324500400007426000250011430000230013960000080016263000090017063000220017985600060020185600060020720251203112651.0  a9789332549579  a005.432UbBAC  aBach, Maurice J.  aDesign of the UNIX operating system  aNoidabPearsonc2015  a471 p.c24 cm.bPB  bc_  aUNIX  aOperating systems  f_  a_