Depending on your level of knowledge, running a command is less of an issue because you can see what you're inputting (and hopefully have some idea what it does, but often not), running scripts though is a different issue since I doubt most people check every line.

Could have a format c: in there somewhere.

It does stuff. With dollar signs. I get dollars from it. Your fragile ego gets a wee boost. Win, win, win.

I generally avoid doing stuff like that on mission-critical (e.g. L4D) systems. Usually if there's much doubt or risk I'll test it out in a VM first.

Installing node.js (I think) the other day on a Pi and I curl'd a script to do all the installing. Didn't even look at the script first. Figured it'd be OK, cos after all I haven't even changed the default user/pass on the pi yet  :-O~~~  :-O~~~  :-O~~~  T_T