# File lib/open4.rb, line 90
    def initialize cmd, status
      @cmd, @status = cmd, status
      @signals = {} 
      if status.signaled?
        @signals['termsig'] = status.termsig
        @signals['stopsig'] = status.stopsig
      end
      sigs = @signals.map{|k,v| "#{ k }:#{ v.inspect }"}.join(' ')
      super "cmd <#{ cmd }> failed with status <#{ exitstatus.inspect }> signals <#{ sigs }>"
    end