shell：ping的并发控制
#!/bin/bash#created by molewan 2017-07-23
Usage(){
echo $"USAGRE:/bin/bash $0"
exit 1
}
if [ "$#" -ne "0" ];then
Usage
fi
CMD="ping -w 2 -c 2"
IP="192.168.1."
for n in `seq 1 254`
do
{
$CMD $IP$n &> /dev/null
if [ $? -eq 0 ];then
echo "$IP$n is ok"
fi
}& #shell的并发检测，批量ping
done
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