I started computing in the age of DOS, which (for any of you not old enough to remember and for those old enough to forget) required you to type in a command whenever you wanted the operating system to perform its duties. I had the most common commands memorized. Say I wanted to copy a file from my cutting-edge 10MB hard drive to my 5.25" floppy disk, I would type "copy c:filename.ext a:" at the command prompt. With the right commands, I could make that big, ugly beige box do some pretty amazing things. Not everyone could do those things when faced with only a monochrome C_＞ prompt and a blinking cursor. It was specialized knowledge.
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