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One of my least favourite things documentation can do (apart from not giving examples) is to have dozens of command line flags and say one flag does the same as another, forcing the reader to find _that_ flag.

For example, the GNU "cp" manual page says "-a" is the same as "-dR --preserve-all". If you look up "-d" it says it is the same as "--no-dereference --preserve=links". So to find out what the first parameter (-a) does, we need to go at least three levels deeper. It's recursive man pages!