I suspect it was more the "I know UNIX!" child hacking that threw him off. :)
I did find the scene ridiculous at the time but it was because I didn't know UNIX or fsn. Now I find it very plausible.
If she'd piped ps through grep into kill then nobody would have ever mentioned it again.
It really wasn't that bad - not quite as super slick as OS installs these days but most of the grief tended to come from having to do things like install it from a stack of floppy disks.