I would implement this as follows:
First read all the filenames into an array, say @files. Next loop over the filenames: for each file create a string of form "x1 y1 z1" corresponding to the 3 values in that file (you could also use an array or hash, but a string will work; you can use matching to collect the values subject to the comments already made in a previous reply.)
Save this string as an element of a global array, say @data. Finally, open your output file and print out the results from @data.
(In your posted code, the opened file TEST doesn't seem to be used...maybe some of your code didn't display properly...)
The actual code should be straightforward to write.
chas

In reply to Re: How do I process multiple files in parallel? by chas
in thread How do I process multiple files in parallel? by Anonymous Monk

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