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gawk: Array Manipulation

 16.4.11 Array Manipulation
 The primary data structure(1) in 'awk' is the associative array (⇒
 Arrays).  Extensions need to be able to manipulate 'awk' arrays.  The
 API provides a number of data structures for working with arrays,
 functions for working with individual elements, and functions for
 working with arrays as a whole.  This includes the ability to "flatten"
 an array so that it is easy for C code to traverse every element in an
 array.  The array data structures integrate nicely with the data
 structures for values to make it easy to both work with and create true
 arrays of arrays (⇒General Data Types).


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