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"Input" refers to any input file, folderdirectory, or string which the command will process or act upon. Some commands require an explicit input, while others have a default value that will be used if no input is provided.
Unix is entirely case sensitive, meaning command names, options, and input files or folders directories must be capitalized correctly. Commands are generally called using all lower case letters, to make them easier to type and remember, and it is a good idea to make directory and filenames all lower case as well.
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The mv command is also used to rename files. When used this way, the mv command "moves" a file from one path to another, even if that path is within the same folderdirectory. To rename a file, add the new name to the end of the target destination:
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