def dpkg(package)
      cmd = command? 'dpkg'
      Open3.popen3 cmd, '-s', package do |_, _, _, wait_thr|
        wait_thr.value.to_i == 0
      end
    end
def dpkg(package)
      cmd = command? 'dpkg'
      Open3.popen3 cmd, '-s', package do |_, _, _, wait_thr|
        wait_thr.value.to_i == 0
      end
    end
Tool specific package lookup methods below.