I think File::Find is a module that you can use for this task..

if not you can do it the harder way, as

opendir(ROOT,'/web/web1/') or die "Can't open directory;
@my_names = readdir(ROOT);
# do a filetest(-d on each element of @my_names,
# you can check directories thusly
foreach my $elem(@my_names) {
    if(-d $elem) { # yup, its a directory
     } # push it onto a stack, for later processing
    else { # file, symlink.. so, check if its the file you <br>want to
+ process... and do stuff with it, or let it alone
    }
}
[download]

So, have this stuff inside a subroutine.. first open the header directory, and pass a list of elements to the subroutine.. keep doing this recursively for each subdirectory you encounter..
HTH
Update: I see YoungPups has already recommended File::Find.. sound advice :o)