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1¡¢while
[root@node01 day4]# cat ping1.sh
#!/bin/bash
ip=1
while [ "$ip" != "254" ]; do
ping -c 2 192.168.3.$ip |grep -q "ttl=" && echo "192.168.3.$ip yes" || echo "192.168.3.$i no"
ip=`expr "$ip" "+" "1"`
done


2¡¢for else
[root@node01 day4]# vi ping2.sh
echo -n "i
#!/bin/bash
ip=192.168.3
for i in `seq 1 255`
do
ping -c 2 $ip.$i> /dev/null 2>&1
if [ `echo $?` -eq 0 ];then
echo -n "
$ip.$i is up
"
else
echo -n "
$ip.$i is down
"
fi
done