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The GNU Awk User's Guide

6.3 Variables

Variables are ways of storing values at one point in your program for use later in another part of your program. They can be manipulated entirely within the program text, and they can also be assigned values on the awk command line.

6.3.1 Using Variables in a Program		Using variables in your programs.
6.3.2 Assigning Variables on the Command Line		Setting variables on the command-line and a summary of command-line syntax. This is an advanced method of input.