Because Brainbench is no longer free, and because they didn't really have great Unix tests anyway, I wrote a pair of Unix programming quizzes.
Unfortunately, they're broken at the moment; my provider updated to a new version of PHP, and I've never had time to figure out why the quizzes stopped working. Still, the review material on this page might be of interest.
All the quizzes (well, there's only two so far) are open book, just like real life. Have a quick read through the review material so you know where to look things up during the quiz.
Approximage score guide for all quizzes:
0-24%: beginner
25%-49%: intern
50%-75%: programmer
75%-100%: expert
The program that administers the quiz isn't very polished yet; apologies.
Tutorials and reference material:
[Sorry, quiz not online.]Tutorials and reference material: