脚本系列（一）查看局网内主机存活
#!/usr/bin/bash
# check host status
#v1
for i in {1..254}
do
{
ip=192.168.8.$i
ping -c 2 -W 1 $ip &>/dev/null
if [ $? -eq 0 ];then
echo "$ip is online" | tee -a /tmp/host_online.txt
else
# echo "$ip is offline" | tee -a /tmp/host_offline.txt
echo "$ip is offline" &>/dev/null
fi
}&
done
wait
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