in reply to How to print header to a CSV file

Do not re-invent wheels which were already invented by others and work very well: Text::CSV has all you need (and more).

Also, why are you repeatedly opening and closing your output file? It will slow down your program enormously.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In Section Seekers of Perl Wisdom