按需生成一个C段的ip地址并自动ping存活，输出结果
脚本逻辑如下

#!/bin/bash

f="/tmp/ip_list.txt"
read -p "input ip prefix(e.g 192.168.1):" ip_prefix    #ip地址前缀，例如192.168.1
read -p "input start ip(e.g 1):" ip_start    #ping测试开始的ip
read -p "input end ip(e.g 254):" ip_end    #ping测试结尾的ip
for i in $(seq ${ip_start} ${ip_end})
do
    echo "${ip_prefix}.$i" >> $f    #生成ip列表
done
for j in $(cat $f)
do
    chk=$(ping -c2 -w2 $j |grep -i "ttl=")    #逐个ping
    if [ ! -z "${chk}" ];then
        echo "$j ok!"
    fi
done
rm -rf $f
echo "done!"

脚本运行效果如下

[root@test-centos ~]# bash pingtest.sh 
input ip prefix(e.g 192.168.1):192.168.20
input start ip(e.g 1):10
input end ip(e.g 254):20
192.168.20.10 ok!
192.168.20.11 ok!
192.168.20.12 ok!
192.168.20.13 ok!
192.168.20.14 ok!
192.168.20.15 ok!
192.168.20.16 ok!
192.168.20.17 ok!
192.168.20.18 ok!
192.168.20.19 ok!
done!

done!