리눅스 트래픽 체크(sulinux 툴)

#!/bin/bashif [ "$1" == "" ] ; then  echo "사용법 : $0 장치명 [delay]"  echo "예) $0 eth0 3 "  exit 1fiif [ "$2" == "" ] ; then delay=3 ; else delay=$2 ; fiecho "시간 : 수신(Kbit/Sec) / 송신(Kbit/Sec)"while ( true ) ; do  rx1=`grep $1 /proc/net/dev | awk '{print $1}' | sed 's/.*://'`  tx1=`grep $1 /proc/net/dev | awk '{print $9}'`  sleep $delay  rx2=`grep $1 /proc/net/dev | awk '{print $1}' | sed 's/.*://'`  tx2=`grep $1 /proc/net/dev | awk '{print $9}'`  # 1024/8 == 128   rx3=$(((rx2-rx1)/128/delay))  tx3=$(((tx2-tx1)/128/delay))  echo "`date '+%k:%M:%S'` : $rx3 / $tx3"done