比如现在需要对192.168.1.0/24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，也可以通过nmap接参数来检查
ping命令脚本如下：
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[root@ZFVM-APP-0-172 shell]# vim ping.sh
#!/bin/bash
. /etc/init.d/functions
for var in {1..254};
do
ip=192.168.1.$var
ping -c2 $ip >/dev/null 2>&1
if [ $? = 0 ];then
action “$ip” /bin/true
else
action “$ip” /bin/false
fi
done
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[root@uatdns01 opt]# bash ping.sh
172.168.1.1 [FAILED]
172.168.1.2 [FAILED]
172.168.1.3 [FAILED]
172.168.1.4 [FAILED]
172.168.1.5 [FAILED]
………
………
192.168.1.249 [FAILED]
192.168.1.250 [FAILED]
192.168.1.251 [FAILED]
192.168.1.252 [FAILED]
192.168.1.253 [FAILED]
192.168.1.254 [FAILED]
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用nmap需要先安装nmap命令
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[root@ZFVM-APP-0-172 shell]# yum install -y nmap
[root@ZFVM-APP-0-172 shell]# nmap -v -sP 192.168.1.0/24 |grep down
Nmap scan report for 192.168.1.0 [host down]
Nmap scan report for 192.168.1.2 [host down]
Nmap scan report for 192.168.1.3 [host down]
Nmap scan report for 192.168.1.4 [host down]
Nmap scan report for 192.168.1.5 [host down]
……
……
Nmap scan report for 192.168.1.251 [host down]
Nmap scan report for 192.168.1.252 [host down]
Nmap scan report for 192.168.1.253 [host down]
Nmap scan report for 192.168.1.254 [host down]
Nmap scan report for 192.168.1.255 [host down]
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检查192.168.1.1网关是否可达的脚本
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[root@ZFVM-APP-0-161 shells]# vim ping.sh
#!/bin/bash
ping www.baidu.com -c 4 -W 5 > /dev/null 2>&1
if [ $? -eq 0 ]
then
echo “网络已通”
else
echo “网络不可达”
fi
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执行结果
[root@ZFVM-APP-0-161 shells]# sh ping.sh
网络可通
运维攻城狮
