This tutorial will provide a basic overview of how to use man to see the manual, or help pages, for a particular program. Using Man ...

If you are doing X11, for example, you can go low-level or pick any of a number of high-level libraries. The tutorial assumes you understand C and basic Linux programming. It has two sections, really.

Certainly, Linux permissions have some parts that are difficult to understand intuitively, such as '755' and '644'. Mr. Riis proceeded with the learning by referring to the following website.