shell隧道获取 ping 命令返回结果 

#!/bin/sh
mkfifo tmpfile
exec 6<>tmpfile

ping 192.168.6.77>&6 &
i=0
while [ $i -le 10 ]
do
    read a<&6
    date
#   echo $a
    i=`expr $i + 1`
done
exec 6>&-

rm tmpfile