For people who create and modify text files, sed and awk are power tools for editing. Most of the things that you can do with these programs can be done interactively with a text editor. However, using sed and awk can save many hours of repetitive work in achieving the same result. This book contains a comprehensive treatment of sed and awk syntax. It emphasizes the kinds of practical problems that sed and awk can help users to solve, with many useful example scripts and programs.