bash
#!/bin/bash

# 监测磁盘I/O
monitor_disk_io() {
  local device=$1
  echo "正在监测磁盘I/O: $device"
  echo "按 Ctrl+C 结束监测"
  echo

  while true; do
    # 获取磁盘I/O信息
    io_stats=$(cat "/sys/block/$device/stat")
    read_completed=$(awk '{print $1}' <<< "$io_stats")
    read_merged=$(awk '{print $2}' <<< "$io_stats")
    read_sectors=$(awk '{print $3}' <<< "$io_stats")
    read_time=$(awk '{print $4}' <<< "$io_stats")
    write_completed=$(awk '{print $5}' <<< "$io_stats")
    write_merged=$(awk '{print $6}' <<< "$io_stats")
    write_sectors=$(awk '{print $7}' <<< "$io_stats")
    write_time=$(awk '{print $8}' <<< "$io_stats")

    # 计算磁盘读取和写入速度
    read_speed=$((read_sectors * 512 / read_time))
    write_speed=$((write_sectors * 512 / write_time))

    # 输出磁盘I/O信息
    echo "磁盘设备: $device"
    echo "读取速度: $read_speed 字节/秒"
    echo "写入速度: $write_speed 字节/秒"
    echo "-----------------------------"
    sleep 1
  done
}

# 主函数
main() {
  # 获取磁盘设备列表
  disk_devices=$(lsblk -ndo NAME,TYPE | awk '$2=="disk" {print $1}')

  if [[ -z $disk_devices ]]; then
    echo "未找到可用的磁盘设备"
    exit 1
  fi

  echo "可用的磁盘设备列表:"
  echo "$disk_devices"
  echo

  # 提示用户选择要监测的磁盘设备
  read -p "请选择要监测的磁盘设备: " selected_device
  echo

  # 检查所选磁盘设备是否存在
  if [[ ! $disk_devices =~ $selected_device ]]; then
    echo "选择的磁盘设备不存在"
    exit 1
  fi

  # 开始监测磁盘I/O
  monitor_disk_io $selected_device
}

# 执行主函数
main