[Ubuntu-zh] 刚自学shell脚本，编了一个貌似不对，求助

[震]

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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