Do you want to write the array into the file in a manner that allows you to then retrieve the data back out of the file? If so, you'll need to decide on an easily parseable format for the file such as CSV (Comma-separated Values, Tab "Delimited", etc.), XML, Fixed Width, etc.
There are modules on CPAN that will take an array of values and turn it into each of those formats. If you let us know what your goal is, we can provide suggestions.
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