--- FileUtils.cp_r( src, dest, *options )
  Options: preserve noop verbose

  src  dest ˥ԡޤsrc ǥ쥯ȥǤäƵŪ
  ԡԤޤκ dest ǥ쥯ȥʤ dest/src 
  ԡޤ

    # installing ruby library "mylib" under the site_ruby
    FileUtils.rm_r site_ruby + '/mylib', :force
    FileUtils.cp_r 'lib/', site_ruby + '/mylib'

--- FileUtils.cp_r( list, dir, *options )
  Options: preserve noop verbose

  list[0]list[1], list[2], Ĥǥ쥯ȥ dir ˥ԡޤ
  list[n] ǥ쥯ȥʤƵŪ˥ԡޤ

    FileUtils.cp_r %w(mail.rb field.rb debug/) site_ruby + '/tmail'
    FileUtils.cp_r Dir.glob('*.rb'), '/home/aamine/lib/ruby', :noop, :verbose

