code: func psPidsArg(pids []uint32) string {
  	b := []byte{'-', 'q'}
  	for i, p := range pids {
  		b = strconv.AppendUint(b, uint64(p), 10)
  		if i < len(pids)-1 {
  			b = append(b, ',')
  		}
  	}
  	return string(b)
  }
docs: // psPidsArg converts a slice of PIDs to a string consisting
  // of comma-separated list of PIDs prepended by "-q".
  // For example, psPidsArg([]uint32{1,2,3}) returns "-q1,2,3".