So, I've seen this a bunch of places now, and I decided to finally do it.
* Grab the book nearest you. Right now.
* Turn to page 56.
* Find the fifth sentence.
* Post that sentence along with these instructions in a note to your wall.
* Don't dig for your favorite book, the coolest, the most intellectual. Use the CLOSEST.
So, the closest book to my chair at work is the Unix System Administration Handbook. Unfortunately, page 56 has no sentences as it's a bunch of charts and tables. However, from A Practical Guide to the Unix System (the next closest volume):
Refer to grep in Part II and to Appendix A, "Regular Expressions," for more information.