sed, awk, and regular expressions allow programmers and system administrators to automate editing tasks that need to be performed on one or more files. sed and awk's strengths, when combined with pattern matching with regular expressions, simplify the task of performing the same edits on multiple files. The sed & awk Pocket Reference is a companion volume to sed & awk and Unix in a Nutshell. This small book is a handy reference guide to the information in the larger volumes, presenting a concise summary of regular expressions and pattern matching, and summaries of sed and awk. Read more