判断条件：能ping通即在线
#!/bin/bash for n in `seq 254` do ping -c2 10.0.0.$n >/dev/null 2>&1 if [ $? -eq 0 ] then echo "10.0.0.$n is up" >> uplist.log else echo "10.0.0.$n is down" >> downlist.log fi done
用shell脚本实现找出在某网段里面的所有在线用户
原文：http://liusibo.blog.51cto.com/1382721/1557925
