New Unix section

Subject says (most of) it all. I have been working with the command line more lately, partially out of need, largely out of preference, and am starting to collect a bunch of little snippets I have modified from other or created out of whole cloth to get me through my day.

The section has a germinal collection of command line snippets, but the real work lies in the shell scripting cheat sheet and info on creating a command line application with Xcode using Foundation classes.