#! /bin/bash
[ $# -ge 2 ] || exit -1

fn="$1"
shift
grep old_id "$fn" | \
while read line; do
	old=`echo "$line" | grep -o 'old_id="[0-9-]*'`
	new=`echo "$line" | grep -o 'new_id="[0-9-]*'`
	old=${old:8}
	new=${new:8}
	sed -i "s/ref=\"${old}\"/ref=\"${new}\"/g" $*
done