Learning the UNIX operating system - Jerry Peek

If you are new to Unix, this concise book will tell you
just what you need to get started and no more. Unix was
one of the first operating systems written in C, a
high-level programming language, and its natural
portability and low price made it a popular choice among
universities. Initially, two main dialects of Unix existed:
one produced by AT&T known as System V, and one developed
at UC Berkeley and known as BSD. In recent years, many
other dialects have been created, including the highly
popular Linux operating system and the new Mac OS X
(a derivative of BSD).Learning the Unix Operating System is a handy book
for someone just starting with Unix or Linux, and it's an
ideal primer for Mac and PC users of the Internet who need
to know a little about Unix on the systems they visit. The
fifth edition is the most effective introduction to Unix
in print, covering Internet usage for email, file transfers,
web browsing, and many major and minor updates to help the
reader navigate the ever-expanding capabilities of the
operating system:

• In response to the popularity of Linux,
  the book now focuses on the popular bash shell preferred
  by most Linux users.
• Since the release of the fourth edition,
  the Internet and its many functions has become part of
  most computer user's lives. A new chapter explains how
  to use ftp, pine for mail, and offers useful knowledge
  on how to surf the web.
• Today everyone is concerned about
  security. With this in mind, the author has included
  tips throughout the text on security basics,
  especially in the Internet and networking sections.