Rating: 

also a very valuable reference for regular expressions. I already knew and used both sed and awk before reading this book, but it pointed

me out so many new solutions and ideas I couldn't imagine at all.

The part I liked more was sed section. I always considered sed like a small yet handy tool, but after I have read sed & awk I was able to exploit all sed's power.

I read this book almost one year ago, but I still use it, and everytime I open it, I learn something more.

Great book.