This is a reference guide to the information presented in the larger volumes. It presents a concise summary of regular expressions and pattern matching, and summaries of Sed and Awk. This edition has expanded coverage of Gawk (GNU Awk), and includes sections on: an overview of Sed and Awk's command line syntax; alphabetical summaries of commands, including Nawk and Gawk; profiling with PGawk; coprocesses and sockets with Gawk; internationalization with Gawk; and a listing of resources for Sed and Awk users.