Actually, no--the filename isn't supplied as the argument to your subroutine. There aren't any arguments, in fact. (Actually, if you peek at @_ in your wanted function, you *will* see arguments. But they're not actually supplied as arguments to your subroutine: they're the arguments to File::Find's finddir subroutine, which calls your wanted sub as &$wanted, which makes its @_ visible to your subroutine.) More in perlsub.

But that's getting off track. Anyway, what File::Find does is sets some package variables and $_ to the file name, the directory, and a combination of those two. From the docs:

    $File::Find::dir contains the current
    directory name, and $_ the current filename within
    that directory. $File::Find::name contains
    "$File::Find::dir/$_".  You are chdir()'d to
    $File::Find::dir when the function is called.
    The function may set $File::Find::prune to prune
    the tree.
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