Switch network configuration in Debian

Home and office have different network configuration, most lies in proxy setup. A simple script as follow is used to switch configuration. Hope it is useful for someone else too.

#!/bin/bash

prog=$(basename $0)

usage()
{
 echo "Usage: $prog <home|work>"
}

if [ $# -ne 1 ]; then
 usage
 exit -1
fi

tnet=$1
if [ $tnet != "home" -a $tnet != "work" ]; then
 usage
 exit -1
fi

if [ "$tnet" == "work" ]; then
 sudo cp /etc/apt/apt.conf.avail/99proxy /etc/apt/apt.conf.d
 gconftool-2 -s -t string /system/proxy/mode auto
else
 sudo rm -f /etc/apt/apt.conf.d/99proxy
 gconftool-2 -s -t string /system/proxy/mode none
fi