After three decades of use, the UNIX computer operating system from Bell Labs is still regarded as one of the most powerful, versatile, and flexible operating systems in the computer world. Its popularity is due to many factors, including its ability to run a wide variety of machines, from micros to supercomputers, and its portability. All of which led to its adoption by many manufacturers, even though the Unix operating system can be challenging to master and hard to use Unix to its highest capabilities. There are many sources in text and on the Internet to help someone learn the many uses of Unix; in which I have chosen five and will cite the positive and negative uses of the source, and how the source helps in the Unix environment.
             The first source I encountered is the book "Unix in a Nutshell," by Arnold Robbins, and Daniel Gilly. This is one of the better sources on Unix because it is the wide-ranging reference for Unix operating system. Its dictionary index of the commands covers everything about Unix, but the index is not for beginners because you have to know what you are looking for to find it. The parts I enjoyed about this book are the extensive index with basically every command known in Unix. I also liked the section on shells because it covers the common features and also includes many examples of the unique csh/ksh/sh shells. The part I did not like about "Unix in a Nutshell" is that it is basically useless to the novice user. It is like a dictionary, which, if you do not know the language, you cannot look up the word, if you do not know what you want to do, you will have a hard time finding the command. Also, the book does not provide a tutorial or a background of Unix. I would still recommend this book to beginners because eventually, it will become useful for the Unix user.
             Another source is a book called "UNIX Power Tools" by Jerry D. Peek, Tim O'Reilly, and Mike Loukides. This b
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