我初学shell，想编一个脚本，作用是根据选择序号，同时改mac和ip（临时性地修改一下即可）。脚本如下：
#!/bin/bash
echo
echo "Type ID below to change your MAC now , 0 to exit ."
echo
echo "1 00:26:82:D8:37:0A" "2 C4:17:FE:E0:13:FD"
echo "3 00:1C:BF:96:47:37" "4 0C:60:76:13:16:7E"
echo
read m
sudo ifconfig wlan0 down
#select in "0" "1" "2" "3" "4"
#do
case $m in
0)
sudo ifconfig wlan0 up
exit;;
1)
sudo ifconfig wlan0 hw ether 00:26:82:D8:37:0A;;
2)
sudo ifconfig wlan0 hw ether 00:1C:BF:96:47:37;;
3)
sudo ifconfig wlan0 hw ether C4:17:FE:E0:13:FD;;
4)
sudo ifconfig wlan0 hw ether 0C:60:76:13:16:7E;;
esac
sudo ifconfig wlan0 up
sudo /etc/init.d/networking restart
exit
貌似我编的不太对，每次运行以后，网就断开了。求修正，谢谢！
另外，不知道临时性更改ip怎么做？再次谢谢！
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