后台抓top 命令到文件内

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# 功能：持续记录 top 命令输出到日志文件

# --- 配置项 ---
LOG_DIR="/data"          # 日志目录
INTERVAL=3               # 刷新间隔（秒）
DURATION=0               # 运行总时长（秒），0=无限运行


# --- 初始化 ---
LOG_FILE="$LOG_DIR/top_$(date +%Y%m%d_%H%M%S).log"  # 带时间戳的日志文件名
#mkdir -p "$LOG_DIR"                                 # 创建目录

# --- 权限检查 ---
if [ ! -w "$LOG_DIR" ]; then
    echo "错误：无法写入目录 $LOG_DIR，请检查权限！"
    exit 1
fi

# --- 主逻辑 ---
echo "开始记录系统状态，日志文件: $LOG_FILE"
if [ "$DURATION" -gt 0 ]; then
    timeout "$DURATION" top -b -d "$INTERVAL" >> "$LOG_FILE"&
else
	echo "topstart"
    top -b -d "$INTERVAL" >> "$LOG_FILE" &
fi

echo "hunanstart!!"






从文件内读取计算cpu

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```bash
#!/bin/bash

# 第一次采样
read -r cpu user nice system idle iowait irq softirq steal rest < <(grep '^cpu ' /proc/stat)
total1=$((user + nice + system + idle + iowait + irq + softirq + steal))
idle1=$((idle + iowait))

# 间隔 1 秒
sleep 1

# 第二次采样
read -r cpu user nice system idle iowait irq softirq steal rest < <(grep '^cpu ' /proc/stat)
total2=$((user + nice + system + idle + iowait + irq + softirq + steal))
idle2=$((idle + iowait))

# 计算差值
total_diff=$((total2 - total1))
idle_diff=$((idle2 - idle1))

# 计算使用率
cpu_usage=$(echo "scale=2; (100 * ($total_diff - $idle_diff) / $total_diff)" | bc)
echo "CPU 使用率: ${cpu_usage}%"

```