#!/bin/bash

if [[ $# != "1" ]]; then
	echo "Usage: $(basename $0) APN"
	exit 1
fi

apn=$1

sed -r -i "s/^OK\s+'AT\+CGDCONT=1,\"IP\",\"[^\"]*\"'$/OK 'AT\+CGDCONT=1,\"IP\",\"${apn}\"'/" /etc/ppp/peers/gsm_chat

if [[ $? != "0" ]]; then
	echo "Failed to change APN"
	exit 1
else
	echo "Set APN to \"${apn}\""
fi

exit 0