tpl = "dladm create-{{{type}}} {{{sets}}} {{{cmd}}}"
key = yaml.keys.first
tpl.gsub! '{{{type}}}', yaml[key]['type']
tpl.gsub! '{{{cmd}}}',  key
sets = ''
set_tpl = '-l {{{key}}} -L={{{mode}}} -P={{{policy}}} '
yaml[key]['device'].each do |device|
  set = set_tpl.dup
  set.gsub! '{{{key}}}',    device[0]
  set.gsub! '{{{mode}}}',   device[1]['mode']
  set.gsub! '{{{policy}}}', device[1]['policy'].join(',')
  sets << set
end
tpl.gsub! '{{{sets}}}', sets
puts tpl.gsub(/\s+/,' ')