Written by Arnold Robbins, Unix expert and lead developer of "gawk, " this thoroughly revised book covers the classic "awk" programming language used by system administrators, programmers, and webmasters to handle simple data-reformatting jobs with just a few lines of code. This book also serves the official documentation for "gawk" 4.1, the GNU version now considered the awk industry standard--available by default on Linux and nearly every Unix-like system. The Mac OS X version of awk is covered as well.