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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
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That is not the only way of doing it nor do I say it is the most efficeint only that is works. In linux there many ways to do what you are asking. Just a matter of how creative you want to get and how much knowledge you have.
By the way everything you ask can be done by simple piping and redirection except, - find the percentage of files in '/home' that contain 'j'. Probaly can be done in one command at the shell with some creative redirection and using the right command, but a small script should do it easy too.
Greg - politeness costs nothing. Lack of same will lead to you not being able to post to this board. Read the Rules again - there are specialist boards that will do your homework for you, this is not one of them.