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No one (except my wife) needs to know that much about my life. We're slowly letting technology invade our privacy under the guise of "social networking"

Set your variable as follows:
bookfile=`cat books.csv`

Then your grep should get every line that has the word "horror" in it. If you want specific fields from each line, you'll need to do...

When I've needed to do this, I've had my first script (cron job) create a file which the second script must find before it can run, etc.