awk计算丢包率

 ＃author souroot
 #email: souroot@163.com
 #we use formular: (all the send packets in agents layer)
 #-(all the recieve packets in agents layer) as all the lost packets
 BEGIN{
     send;
     recv;
 }
 {
     if(($1)=="s" && ($4)=="AGT")
         send++;
     if(($1)=="r" && ($4)=="AGT")
         recv++;
 }
 END{
     printf "send is %d, recv is %d\n",send,recv;
     printf "drop rate is %4f\n",(send-recv)/send;
 }

 注意：$1代表第一列，$4代表第四列。BEGIN表示循环开始，END表示循环结束