First off, I never used sudo...

Second off, you're not steaming into bash

Third, you gotta read between the lines a little. I used some convenience considering my audience is programmers. Don't use && or shove && `less foo.sh` in the middle. There's a million options here

Don't take the example overly literally. Saving to file means you can read it before executing it.

That aside, it protects you from this gaping hole of an exploit mechanism. https://news.ycombinator.com/item?id=17636792