00270nam a2200109 a 450000500170000002000150001708200170003210000180004924500230006726000440009030000260013420251203110625.0  a8120314891  a005.432bSRI  aSrirengan, K.  aUnderstanding Unix  aNew DelhibPrentice-Hall of Indiac2003  aviii,205p.c24 cm. PB