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    (file/popen command &opt mode) (DEPRECATED for os/spawn)

    Open a file that is backed by a process. The file must be opened in
    either the :r (read) or the :w (write) mode. In :r mode, the stdout
    of the process can be read from the file. In :w mode, the stdin of
    the process can be written to. Returns the new file.

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