今天中午的作业，写shell脚本，使用ping判断指定IP或者IP端内的主机存活。
只接受规定的IP格式输入和IP段输入(例如：192.168.2.88 或 192.168.2.)注意，写IP段的时候后面有个点...脚本简陋...看官将就一下吧；上代码：
#!/bin/bash
read -p "Please input ip:(192.168.0.22) or (192.168.0.)" Ip Test=`echo $Ip|grep "\<[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\$"` Test1=`echo $Ip|grep "\<[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.\$"` #echo "a IP is: $Test" #echo "IP.is $Test1" if [[ -z $Test && -z $Test1 ]];then echo "input error!" exit 1 elif [[ -n $Test ]];then for i in `seq 1 4` do Cut=`echo $Test|cut -d"." -f$i` if [ $i -eq 1 ];then if [ $Cut -gt 223 -o $Cut -lt 1 ];then echo "input $Test ---->> $Cut invalid" exit 2 fi else if [ $Cut -gt 254 ];then echo "input $Test ---->> $Cut invalid" exit 2 fi fi doneif ping -c 2 -W 1 $Test &> /dev/null ;then
echo "Have $Test" else echo "No $Test" fi else for i in `seq 1 3` do Cut=`echo $Test1|cut -d"." -f$i` if [ $i -eq 1 ];then if [ $Cut -gt 223 -o $Cut -lt 1 ];then echo "input $Test1 ---->> $Cut invalid" exit 2 fi else if [ $Cut -gt 254 ];then echo "input $Test1 ---->> $Cut invalid" exit 2 fi fi done declare -i Num declare -i Fail Num=0 Fail=0 for i in `seq 1 10`do
if ping -c 1 -W 1 ${Test1}$i &> /dev/null ;then echo "Have ${Test1}$i" Num=$((Num+1)) else Fail=$((Fail+1)) echo "No ${Test1}$i" fi done echo "Host online have $Num ." echo "Host no online have $Fail ."
最后一个for循环，我嫌多，只写了10个值，有兴趣的哥们，自己改 seq 1 10改成1 254即可...还有关于a类b类c类网，由于本人网络方面知识的欠缺，所以判断的值，估计挺不正确的，列位就谅解一下吧....