readdir
readdir - get a directory from a directory handle
readdir DIRHANDLE
Returns the next directory entry for a directory opened by 
opendir()
.
If used in a list context, returns all the rest of the entries in the
directory.  If there are no more entries, returns an undefined value in
a scalar context or a null list in a list context.
If you're planning to filetest the return values out of a 
readdir()
, you'd
better prepend the directory in question.  Otherwise, since we didn't
chdir()
 there, it would have been testing the wrong file.
    opendir(DIR, $some_dir) || die "can't opendir $some_dir: $!";
    @dots = grep { /^\./ && -f "$some_dir/$_" } readdir(DIR);
    closedir DIR;