I think you might have missed the subtlety here. The interesting bit isn't `grep '^127' /etc/hosts`. It's `|`. There are umpteen ways to launch individual ap

I think you might have missed the subtlety here. The interesting bit isn't `grep '^127' /etc/hosts`. It's `|`. There are umpteen ways to launch individual applications, but nobody's yet come up with quite such a flexible, simple and expressive way of getting them to communicate as streams of text.