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It used to be said that Unix and Linux were short on documentation. Nowadays, if anything, there's too much. This lab will guide you to some of the sources of documentation.
I will deal first with the most traditional source of documentation for Unix and Linux systems, the so-called "manual" pages, often abbreviated to "manpages." The usage and format of these goes back many years. They were originally intended to document the command-line tools, and that is still their main purpose. You will, generally speaking, not find manpages for the graphical tools.