Learning the UNIX Operating System, 4th Edition by Jerry Peek, Grace Todino, and John Strang Unconfirmed error reports are from readers. They have not yet been approved or disproved by the author or editor and represent solely the opinion of the reader. This page was updated October 22, 2002. Here's the key to the markup: [page-number]: serious technical mistake {page-number}: minor technical mistake : important language/formatting problem (page-number): language change or minor formatting problem ?page-number?: reader question or request for clarification UNCONFIRMED errors and comments from readers: (index), the F section is broken up with N for nf command.