比如现在需要对172.16.50.0/24网段的ip进行检查，检查哪些ip现在被占用，哪些ip没有被占用，可以通过ping命令来检查，脚本如下：
[root@uatdns01 opt]# vim /opt/ping.sh
#!/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
[root@uatdns01 opt]# chmod 755 /opt/ping.sh
[root@uatdns01 opt]# sh /opt/ping.sh
172.16.50.1 [ OK ]
172.16.50.2 [FAILED]
172.16.50.3 [FAILED]
172.16.50.4 [FAILED]
172.16.50.5 [FAILED]
.........
.........
172.16.50.99 [ OK ]
172.16.50.100 [ OK ]
172.16.50.101 [ OK ]
172.16.50.102 [ OK ]
172.16.50.103 [ OK ]
172.16.50.104 [ OK ]
172.16.50.105 [ OK ]
172.16.50.106 [ OK ]
172.16.50.107 [ OK ]
172.16.50.108 [ OK ]
172.16.50.109 [ OK ]
172.16.50.110 [ OK ]
172.16.50.111 [FAILED]
172.16.50.112 [ OK ]