Awk-A Pattern Scanning and Processing Language

Command Syntax: awk [-F delim] [-f pgmfile or 'command str'] inputfile awk processes its input one line at a time, applying commands to the line when it matches the pattern associated with the command. Each input line is broken up into fields called $1, $2, …, based on the current value of the FS (field separator) variable. The awk program consists of one or more patterns on separate lines or separated by semicolons. Each pattern has the form: pattern { action } awk Patterns (like grep, sed, and vi) In awk, a pattern is an arbitrary Boolean expression involving regular expressions and relational expressions. Patterns can be any of the following: