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A few errors noticed that sound like the reader didn't clearly understand the copy.
Not that I would expect her to, but the author or proofreader (-listemer?) should have caught it.
change current directory to parent, i.e. move up a directory level.
the reader apparently took the second period as punctuation for the sentence she was reading,
so she read it as "cd . "
which sort of doesn't do anything!
Otherwise this is a nice overview.