linux监控流量脚本

#!/bin/bash
Rx=`ifconfig eno16777736 | grep RX | grep packets | awk '{print $5}'`
Tx=`ifconfig eno16777736 | grep TX | grep packets | awk '{print $5}'`
sleep 2
Rx1=`ifconfig eno16777736 | grep RX | grep packets | awk '{print $5}'`
Tx1=`ifconfig eno16777736 | grep TX | grep packets | awk '{print $5}'`
r=$[$[$Rx1-$Rx]/1024]
t=$[$[$Tx1-$Tx]/1024]
rx=`awk 'BEGIN{printf "%.4f",('$Rx1'-'$Rx')/2/1024}'`
tx=`awk 'BEGIN{printf "%.4f",('$Tx1'-'$Tx')/2/1024}'`
if [ $r -ge 1024 ]
then
rx=`awk 'BEGIN{printf "%.4f",('$Rx1'-'$Rx')/2/1024/1024}'`
echo "$rx"MB/s
else
echo "$rx"KB/s
fi

if [ $t -ge 1024 ]
then
tx=`awk 'BEGIN{printf "%.3f",('$Tx1'-'$Tx')/2/1024/1024}'`
echo "$tx"MB/s

else
echo "$tx"KB/s 
fi