For the advanced users who know exactly what command they are after and are looking only for examples or command line options, the book has two command indexes:
all commands are indexed in the back of the book, as are term definitions, procedures, and the rest of the content.
there is a second index in the front for executable programs only.
Did you ever find yourself digging around looking for a command that you know must exist, only you don't have any idea what it might be called? Back when I was in school I clearly remember fumbling around for an hour trying to figure out what command I'd use to lower the priority of a running process. ...