00470nam a2200193Ia 4500003000400000005001700004008004100021040001000062082001600072100001900088245004000107250000900147260001400156260003400170260000900204300001000213650002400223650002900247AIT20230201182000.0221231s9999    xx            000 0 und d  catria  a621.381 LEA  aDonald P Leach 0aDigital Principles and Applications  a4 th  aNew Delhi  bMcGraw Hill Education PVT LTD  c2007  a671p.  aInformation Science  bUNIX,Information Science