丢包率的计算AWK

＃author souroot
#email: [e-mail]
#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;
}