gawk: Assigning Elements

 
 8.1.3 Assigning Array Elements
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 Array elements can be assigned values just like 'awk' variables:
 
      ARRAY[INDEX-EXPRESSION] = VALUE
 
 ARRAY is the name of an array.  The expression INDEX-EXPRESSION is the
 index of the element of the array that is assigned a value.  The
 expression VALUE is the value to assign to that element of the array.