my $directory = "/path/to/files";
opendir DIR, $directory or die "can't open $directory: $!\n";

while (my $file = readdir DIR) {
	next unless -f "$directory/$file";
	open FILE, "$directory/$file" or warn "Can't open $file: $!\n", next;
	# do stuff to FILE
	close FILE;
}
closedir DIR;

##</code><code>##

perl -e 'print "How sweet does a rose smell? "; chomp $n = <STDIN>; $rose = "smells sweet to degree $n"; *other_name = *rose; print "$other_name\n"'