"Using a Unix system requires a lot of knowledge, and it's
common to see Unix users and administrators spending a lot of time
reading handbooks, tutorials and man pages to find out the 'right'
sequence of keystrokes. In the publishing world there is a little
pearl, a single source of information about Unix and how to use it:
Unix Power Tools, published by O'Reilly and Associates. O'Reilly is
a well known publisher of Unix books; in this one, you'll see Tim
O'Reilly himself as an author...!"