To fully exploit the marvelous utility of the unix file system naming conventions, how about this?
my $max_num = 255;
my @chars = ('a' .. 'z', 'A' .. 'Z',0 .. 9, '_');
my $filename = join("", map { $chars[int rand(0+@chars)] } 1 .. $max_n
+um);
I don't have the energy right now, but a further helpful revision would be filling in all of the characters Unix allows in filenames. Oh, wait. That would be all of them except null. The mind boggles ;-)
for(split(" ","tsuJ rehtonA lreP rekcaH")){print reverse . " "}print "\b.\n";