检查哪些ip现在被占用脚本

1、对某一段IP检查1-254
#!/bin/bash
. /etc/init.d/functions
for var in {1..254};
do
ip=172.16.50.$var
ping -c2 $ip >/dev/null 2>&1
if [ $? = 0 ];then
action “$ip” /bin/true
else
action “$ip” /bin/false
fi
done

2、获取172.16.60.0/24网段可用ip的shell脚本
#!/bin/bash
ip=1
while [ $ip != “254” ]; do
ping 172.16.60.$ip -c 2 | grep -q “ttl=” && echo “172.16.60.$ip yes” || echo “172.16.60.$ip no”
ip=expr "$ip" "+" "1"
done

3、获取172.16.50.0/24, 172.16.51.0/24, 172.16.60.0/24 三个网段的可用ip
#!/bin/bash
ip=1
while [ $ip != “254” ]; do

ping 172.16.50.$ip -c 2 | grep -q “ttl=” && echo “172.16.50.$ip yes” || echo “172.16.50.$ip no” >/dev/null 2>&1
ip=expr "$ip" "+" "1"

ping 172.16.51.$ip -c 2 | grep -q “ttl=” && echo “172.16.51.$ip yes” || echo “172.16.51.$ip no” >/dev/null 2>&1
ip=expr "$ip" "+" "1"

ping 172.16.60.$ip -c 2 | grep -q “ttl=” && echo “172.16.60.$ip yes” || echo “172.16.60.$ip no” >/dev/null 2>&1
ip=expr "$ip" "+" "1"

done