I started using it about a year ago (I wasn't aware of it before that) and it's astonishing the number of things it can pick up on in even a five line script.

I started using it about a year ago (I wasn't aware of it before that) and it's astonishing the number of things it can pick up on in even a five line script. Often they're things you will get away with most or even all of the time in a specific scenario, but there they lurk, waiting to blow your leg off when you start including spaces in a filename or somesuch!