[__david__]

First off, as someone already pointed out GNU rm does fail on `rm -rf /`. Secondly, that one is way more important than trying to protect `find / -delete` and `rm -rf /usr` because it's just way easier to mess up and have a stray slash in your command line.

Case in point, a unix novice coworker of mine came up to me once and said, I think I might have done something wrong. I'm trying to remove an empty directory and it's hanging. Turned out he created a directory in whatever linux workspace gui he was running at the time and accidentally added a space at the end. He didn't notice until he used terminal `ls` to look at it and then noticed it printed like this (with `ls -F`):

  somedir /

So he decided to rm it and start over. Can you guess what he typed?

[brianmwaters_hn]

For the record, GNU's Not Unix.