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8 Arrays in awk

An array is a table of values called elements. The elements of an array are distinguished by their indices. Indices may be either numbers or strings.

This chapter describes how arrays work in awk, how to use array elements, how to scan through every element in an array, and how to remove array elements. It also describes how awk simulates multidimensional arrays, as well as some of the less obvious points about array usage. The chapter moves on to discuss gawk’s facility for sorting arrays, and ends with a brief description of gawk’s ability to support true arrays of arrays.

Array Basics    The basics of arrays.
Numeric Array Subscripts    How to use numbers as subscripts in

awk.

Uninitialized Subscripts    Using Uninitialized variables as subscripts.
Delete    The delete statement removes an element

from an array.

Multidimensional    Emulating multidimensional arrays in

awk.

Arrays of Arrays    True multidimensional arrays.
Arrays Summary    Summary of arrays.