從清單裡讀IP，並且一個一個Ping

 Use: save a s script file such as ip.sh and ./ip.sh xxx OOO, it means ping every XXX*n+OOOth packet.

#!/bin/bash
count=1
cat Type1_black.list | while read line
do
if [ expr $count % $1 -eq $2 ]
then
echo ‘==============================’
echo expr $count
echo date
echo $line
#ping -c 10 -W 1 $line
ping -c 10 $line
#echo ‘==============================’
fi
count=$[$count+1]
done