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When you're just getting started with a new operating system, you have to learn how to get around and perform basic actions like navigating the file structure, reading and writing files and creating and deleting files and directories. The command line is very similar in this regard.
One stumbling block for many first time command line users is the fact that when you startup your command line, you're just given a blank screen with a prompt where you can type in your command. Since there isn't anything to indicate what you should do next, you have to already know the commands before you get started.
This series will lay out some of the most basic command line commands. These are the ones you're most likely to use every time you open up the command line.