./bit.sh

#!/bin/bash
ens32=enx98fc84ec6c5b
echo -e "流量进入--流量传出 "
while true; do
old_in=$(cat /proc/net/dev |grep $ens32 |awk '{print $2}')
old_out=$(cat /proc/net/dev |grep $ens32 |awk '{print $10}')
sleep 1
new_in=$(cat /proc/net/dev |grep $ens32 |awk '{print $2}')
new_out=$(cat /proc/net/dev |grep $ens32 |awk '{print $10}')
in=$(printf "%.1f%s" "$((($new_in-$old_in)/1024))" "KB/s")
out=$(printf "%.1f%s" "$((($new_out-$old_out)/1024))" "KB/s")
echo "$in $out"
done

./bits.sh enx98fc84ec6c5b

#!/bin/bash  
  
NIC=$1  
  
# 检查是否提供了网络接口名称  
if [ -z "$NIC" ]; then  
    echo "Usage: $0 <NIC>"  
    exit 1  
fi  
  
echo -e " In (KB/s) ------ Out (KB/s)"  
  
# 初始化旧的接收和发送字节数  
OLD_STATS=$(awk -v nic="$NIC" '$0 ~ nic {print $2, $10}' /proc/net/dev)  
read OLD_IN OLD_OUT <<< "$OLD_STATS"  
  
while true; do  
    # 读取新的接收和发送字节数  
    NEW_STATS=$(awk -v nic="$NIC" '$0 ~ nic {print $2, $10}' /proc/net/dev)  
    read NEW_IN NEW_OUT <<< "$NEW_STATS"  
  
    # 计算差值并转换为KB/s  
    IN=$(printf "%.1f%s" "$((($NEW_IN-$OLD_IN)/1024/2))" "KB/s")  
    OUT=$(printf "%.1f%s" "$((($NEW_OUT-$OLD_OUT)/1024/2))" "KB/s")  
  
    # 输出结果  
    echo "$IN $OUT"  
  
    # 更新旧的接收和发送字节数为新的值  
    OLD_IN=$NEW_IN  
    OLD_OUT=$NEW_OUT  
  
    # 等待一秒后再次检查  
    sleep 1  
done