判断 192.168.0.0/24 网络里，当前在线的 IP 有哪些，能 ping 通则认为在线
# 脚本如下
代码语言：javascript复制#!/bin/bash
for ip in `seq 1 255`;do
ping -c 1 192.168.0.$ip > /dev/null 2>&1
if [ $? -eq 0 ];then
echo "192.168.0.$ip UP"
else
echo "192.168.0.$ip DOWN"
fi
done
# 执行效果
代码语言：javascript复制[root@summer include]# ./ping.sh
192.168.0.1 UP
192.168.0.2 DOWN
192.168.0.3 DOWN
192.168.0.4 DOWN
192.168.0.5 DOWN
192.168.0.6 DOWN
192.168.0.7 UP
192.168.0.8 UP
192.168.0.9 UP
192.168.0.10 UP
192.168.0.11 UP
192.168.0.12 DOWN
192.168.0.13 UP
192.168.0.14 UP
192.168.0.15 DOWN
192.168.0.16 UP
192.168.0.17 UP
192.168.0.18 UP
192.168.0.19 UP
192.168.0.20 UP
192.168.0.21 DOWN
192.168.0.22 DOWN
192.168.0.23 DOWN
192.168.0.24 DOWN
192.168.0.25 DOWN
192.168.0.26 DOWN
...
