This built-in function splits the string value of the expression or variable var, and puts the result into the array variable array (i.e., array[0], array[1], etc.). fs is a string containing the field separator variables. If fs is omitted, i.e., split(var, array), then IFS is used for fs. The parameter var is a string variable or expression, array is an array, and fs is an optional string constant.

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