00262nam a2200109 a 450000500170000002000150001708200190003210000190005124500400007026000220011030000200013220251203091529.0  a8170291070  a001.6424,bpra  aPrata, Stephen  aAdvanced UNIX: a programmer's guide  aDelhi: BPB.c1986  ax,484p.c23 cm.