Title: Endorsing other people reviews
Review: I must agree with the others reviews. This book is an invaluable resource that will save your time reading those boring, 1000-page, IBM Redbooks. It gives a nice introduction on IBM Mainframes, operating system concepts, as well mastering JCL skills. After reading this book you will feel more confident to go deeply into the IBM documentation and learn the extra skills needed to your area (databases, networking, programming, etc.).
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