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Variables and Fields

awk variables are dynamic; they come into existence when they are first used. Their values are either floating-point numbers or strings. awk also has one-dimension arrays; multiple-dimensional arrays may be simulated. There are several predefined variables that awk sets as a program runs; these are summarized below.

• Fields Summary: Input field splitting.
• Built-in Summary: awk's built-in variables.
• Arrays Summary: Using arrays.
• Data Type Summary: Values in awk are numbers or strings.

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