If I have a need to process all of the files in a directory tree, I use find2perl to generate a template. If you are familiar with the *ix find command, there are several options you can use to your advantage, but I usually stick to find2perl / -type f -print > template.pl . You can substitute any starting directory instead of / to suit, and the -type f will limit the code to files.

You should end up with this subroutine:

sub wanted {
    my ($dev,$ino,$mode,$nlink,$uid,$gid);
    (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
    -f _ &&
    print("$name\n");
}
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I replace the print("$name\n") with my code that performs an action on every file.