One stupid question. in() and name() are subs in the package. What is file() there? 
  use File::Find::Rule;
  # find all the subdirectories of a given directory
  my @subdirs = File::Find::Rule->directory->in( $directory );

  # find all the .pm files in @INC
  my @files = File::Find::Rule->file()
                              ->name( '*.pm' )
                              ->in( @INC );

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In reply to Re^4: reading file names to an array from the directory tree by vit
in thread reading file names to an array from the directory tree by vit

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