This crash course in Unix should give you a first helping of guidance—enough to perform some genuinely useful tasks in Mac OS X, and to acquire a feeling for how Unix commands work.
There’s a lot more to learn, however. As you peruse beginner-level Unix books and Web sites (see Appendix E), for example, you’ll gradually become familiar with a variety of important terms and tools.
Don’t be confused: Aliases in Unix have nothing to do with traditional Macintosh icon aliases. Instead, Unix aliases are more like text macros, in that they’re longish commands that you can trigger by typing a much shorter abbreviation.