A vital step in the evolution of apes was the emergence of fingers, which better enabled them to create and use tools. Then apes developed fine motor skills and opposable thumbs, becoming human in the process. Then humans developed the keyboard, which led to hackers. This chapter explores the command-line environments you should be familiar with in order to take advantage of and use most of the tools throughout this book. Even if you followed a different evolutionary process and lack an opposable thumb (they’re only really used for the SPACEBAR anyway), you’ll find that the Unix command line and its ilk provide ...

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