--- FileUtils.install( src, dest, mode = <src's>, *options )
  Options: noop verbose

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  Τ⡼ɤ mode ꤷޤ

    FileUtils.install 'ruby', '/usr/local/bin/ruby', 0755, :verbose
    FileUtils.install 'lib.rb', '/usr/local/lib/ruby/site_ruby', :verbose

