Shell Scripting Primer If you've ever wanted to really take advantage of that powerful Unix workhorse underneath your beautiful Mac's Aqua, here's a good place to get started. In another of its excellent, well designed, well written, and thorough technology guides, Apple provides an introduction to the Bourne shell, regular expressions, awk, and more that's an essential reference on the subject. As always, it's available online in HTML, plus a single PDF version, and in this case there's also a zip file with dozens of example scripts, most of them referenced in the guide.