If something isn't what you expect, print the values and use them to trace along. Try printing the values where you expect them to be set, and print the source you expect them to be set from.
For example, you set: 
$sample = $fields[1];

[download]
but you have no check to see how many fields you actually found. Sample is undef? Then $fields[1] was undef, which implies in turn that there was no \t in your $_.

In reply to Re: processing a lot of files by SuicideJunkie
in thread processing a lot of files by lomSpace

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