Yes, that was an error. Also, see now that Grandfather's solution was about the same as mine. He used a Hash of Hash, where I used a Hash of Array.
If no recs were found in the last file(s), no array entry was created.

Correct line is,
my @avgs = map $usage{$server}[$_] || 0, 0..$files-1;
instead of
my @avgs = map $usage{$server}[$_] || 0, 0..$#{$usage{$server}}; Update: changed 0..$i-1 to 0..$files-1

In reply to Re^3: Eliminating Duplicate Lines From A CSV File by Cristoforo
in thread Eliminating Duplicate Lines From A CSV File by country1

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