Hi BrowserUK,

Thank you for your suggestions. It appears that it is only the first file that is getting appended to the text-file. This is true if the file exists before the program executes or not.

I also added return code checking like so:

if (!open(OUT, '>>', 'Results.txt')) {
     print "Open file failed!\n";
     exit();
     }
[download]

Unfortunately this did not change the program output. I also have very large diskspace free (many GB). Strange too that the data gets populated into the hash, but doesn't want to write to disk. I will try incrementing filenames (e.g. open new file for each loop iteration). If that can work then the problem must be with the '>>' mode of the file-handle somehow.

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