read or search the item in a file sequentially by the position

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Any 1 know this?? Is it we can read or search the item in a file sequentially by the position using unix shell script..?? The position i means is: for example.. inside the xxx file, it contain with: ---------------------------------------------------------------------- 1200120136420 1210324120 12145123 1200120136420 1210324120 22178210 ---------------------------------------------------------------------- position: 12345678901234567890123 4 Then i wanna grep or search for value in position 24 = 0. like that.. position is count space by space or character or alphanumeric length..