Perl::Tidy has a "line length" parameter. See Perl Tidy documentation. 80 characters is actually the default length used.
in reply to 80 Line Limit for 100+ files
Code::TidyAll is also something you might want to take a look at.
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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