如何将 echo 语句和 arp 语句的输出放在一行？答案

【问题标题】：How to place the output of an echo statement and an arp statement on one line?如何将 echo 语句和 arp 语句的输出放在一行？
【发布时间】：2015-08-30 02:17:34
【问题描述】：

如何在一行中获得输出“echo”和“macaddress”？这就是我所拥有的：

ipRange="192.168.0."
macaddress= arp  | grep -w  "$ipRange$1" | awk '{print $3,$1}' 

ping -c1 "$ipRange$1" > /dev/null
         if [ $? -eq 0 ]; then
echo  "deze host met mac address en ip address is up $macaddress"
else 
echo "het is down"
fi

这是输出：

VirtualBox ~ $ bash test2.sh 149
e0:b9:a5:f8:24:c3 192.168.0.149
deze host met mac address en ip address is up

【问题讨论】：

提供所需的示例输出/代码
@Jahid deze host met mac address en ip address is up e0:b9:a5:f8:24:c3 192.168.0.149
@Jahid 或者如果有可能“de 主机遇到 mac 地址：e0:b9:a5:f8:24:c3 en ip address: 192.168.0.149 is up”
echo "de host met mac address: $macaddress en ip address: $ipRange$1 is up" 同时将macaddress=... 更改为macaddress=$(command)
@Jahid 好的，谢谢！

标签： linux bash shell output

【解决方案1】：

这应该是单行输出

ipRange="192.168.0."
macaddress=$(arp  | grep -w  "$ipRange$1" | awk '{print $3,$1}')

ping -c1 "$ipRange$1" > /dev/null
         if [ $? -eq 0 ]; then
echo  "deze host met mac address en ip address is up $macaddress"
else 
echo "het is down"
fi

【讨论】：

用fgrep 替换grep -w 可能是个好主意。试试这个：echo 1.2.3.4 | grep -qw 1.2.3. || echo nope

【解决方案2】：

只需替换macaddress= arp | grep -w "$ipRange$1" | awk '{print $3,$1}'

macaddress=$(arp | grep -w "$ipRange$1" | awk '{print $3,$1}')

【讨论】：

用fgrep 替换grep -w 可能是个好主意。试试这个：echo 1.2.3.4 | grep -qw 1.2.3. || echo nope