Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Book has factual errors and important omissions

This supplements prior review. Description of ARGV on page 328 is in error. $ARGV[0]is first argument on command line NOT the script name (as it would be in C). Also, I can find no description on use of backquotes in this manual. It looks nice, is generally well-organized, but incomplete and inaccurate.