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Episode 3: No mention of letter case for file names and directories #736
This depends on the filesystem being used. By default Mac OSX is NOT case sensitive, despite being an actual Unix (bearing in mind Linux is not a Unix but a clone).
My opinion is that it should be phrased along the lines of "Most filenames are lowercase by convention, although some desktop environments may create a default set of directories with capitols at the start, such as Desktop and Documents".