This article is an excerpt from the new 2nd Ed. of Mark Sobell's book,
A Practical Guide to Linux Commands, Editors, and Shell Programming,
published Nov. 2009 by Prentice Hall Professional, ISBN 0131367366,
Copyright 2010 Mark G. Sobell. For additional sample content from a
selection of chapters, please visit the publisher site:
www.informit.com/title/0131367366
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