$ for file in $(ls); do echo $file; done

Please don't do this. I understand why it was put there, but don't. There are other examples of this construct, and most of them actually make sense.

People reading the article are not shell experts and don't know that in this particular case it's extremely bad idea to use `ls` (shell wildcard is the proper way here), so don't give them such example. This statement should be burned with fire.