基于ubuntu编写的几个shell脚本

1.检测整个局域网内存活的主机(仅适用ping，不使用nmap)

ping 广播地址需要加-b，进行另外判断

#!/bin/bash

#define functions
usage()
{
	echo "usage:$0 192.168.1"
}

#check ip
if [ -z $1 ]; then
	usage
	exit 0
fi

#check the whole net
for((i=1;i<256;i++)); do
	#ping broadcarst need to add -b
	if [ $i -eq 255 ]; then
		ping -b -c 1 $1.$i | grep -o ttl >> /dev/null
	else
		ping -c 1 $1.$i | grep -o ttl >> /dev/null
	fi

	#check if the ping is succeed
	if [ $? -eq 0 ]; then
		echo "$1.$i is up"
	fi
done

2.根据ip地址查找mac地址

首先ping一次ip，用于刷新arp cache，以防存活的主机不再arp  cache中

#!/bin/bash
###first ping the host to refresh the arp cache,then check the arp list###

#define function
usage()
{
	echo "usage:$0 192.168.1.2"
}

#check the ip
if [ -z $1 ]; then
	usage
	exit 0
fi

#fresh the arp cache
ping -c 1 $1 > /dev/null
if [ $? -eq 0 ]; then
	echo -n "Host is up.Mac is "
	arp -a | grep "($1)" | awk '{print $4}'	
else
	echo "host is down"
fi

3.根据mac查找相应的ip

基于nmap软件，所以首先需要apt-get install nmap

#!/bin/bash

#define function
usage()
{
	echo "usage: $0 00:00:00:00:00:11"
}

#check user
if [ $UID -ne 0 ]; then
	echo "plesase run this with sudo"
	exit 0
fi

#check parameter
if [ -z $1 ]; then
	usage
	exit 0
fi

#not capitalized is converted to uppercase
mac=`echo $1 | tr '[a-z]' '[A-Z]'`

#check host
nmap -sP 192.168.1.0/24 > temp.txt && grep -n $mac temp.txt > /dev/null
if [ $? -eq 0 ]; then
	line=`awk '/'$mac'/{print NR}' temp.txt`
	awk NR==$line-2 temp.txt && awk NR==$line-1 temp.txt && awk NR==$line temp.txt
	exit 0
else
	echo "host doesn't exist"
fi
rm temp.txt