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thank you so much
i'm try to understand the usage of this method

ifconfig eth0|awk 'NR==8{print $2;exit}'|cut -c7-
it also the same result when i run the command like this
ifconfig eth0|awk 'NR==8{print $2}'|cut -c7-
can u tell me the effect of ";exit" ？

thank you very much!
i think this unix forum is the most rigorous forum i had ever see,which make a big difference with China
thanks Corona688
ps:sorry for my poor english ^_^

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yes,you're right,that's the reason why you can't ping your gateway
you can telnet into your router and add a arp map in hand,just input your ip with the unix pc's en2 mac addres,then i think it...

ok，i know you means，thank you
that’s difference
if the variable need to return the lastest value，i must recall it，right？

oh,i don't understand
my shell file like this
#!/bin/sh
#
#
testnum=$(ifconfig eth0|sed -n 8p|awk '{print $2}'|cut -c7-)
echo $testnum
sleep 2
echo $testnum
sleep 2
echo $testnum
sleep 2...