Instruct: Classify Amazon reviews into positive or negative sentiment
Query: "Where's the rest of me?" - Ronald Reagan in "King's Row"

Is it just me, or shouldn't a work which purports to teach how to use a shell which includes such conditional statements as "if", "else" and "then" actually explain their syntax and usage... or even ACKNOWLEDGE their existence in more than passing?This book contain NO instructions on how to use statements to control program flow. I can't even find the word "if" in the index. That is the equivalent of a driver's education video which never shows the steering wheel or how it's used, and only alludes without explanation to its existence.Apparently other people writing about Csh/Tcsh seem to think so, since they at least bother to mention statements which control program flow. Of course those sources were available free from the Web. I guess that the more expensive the source, the more nebulous and incomplete the information provided....