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在bash 4.4.12，help cd说：

Options:
  -L        force symbolic links to be followed: resolve symbolic
            links in DIR after processing instances of `..'
  -P        use the physical directory structure without following
            symbolic links: resolve symbolic links in DIR before
            processing instances of `..'
  -e        if the -P option is supplied, and the current working
            directory cannot be determined successfully, exit with
            a non-zero status
  -@        on systems that support it, present a file with extended
            attributes as a …

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