in reply to Matching data in a big file

Have a look also at File::Slurp and its edit_file and edit_file_lines functions which can do "in place" edits to your file.

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

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In Section Seekers of Perl Wisdom