shell編程之測試當前主機的連通性

#!/bin/bash
for ipsuffix in $(seq 254); do
ip=192.168.16.${ipsuffix}
if ping -c1 -w2 $ip &>/dev/null; then
echo 
"$ip is UP."
else
"$ip is DOWN."
fi

done

seq命令的語法如下.

1)生成序列[1..LAST]，步長爲1:

seq LAST

2)生成序列[FIRST..LAST]，步長爲1：

seq FIRST LAST

3)生成序列[FIRST..LAST]，步長爲INCREMENT:

seq FIRST INCREMENT LAST