#!/bin/sh

start=$1
end=$2
new_start=$3
filename=$4

if [ -z "$filename" ] ; then
	echo Usage: $0 start-oid end-oid new-start-oid filename
	exit 1
fi

if [ ! -f $filename ] ; then
	echo $0: $filename is not a file
	exit 1
fi

if [ $end -le $start ] ; then
	echo $0: End of OID range must be greater than or equal to the start
	exit 1
fi

start_len=`echo -n $start | wc -c`
end_len=`echo -n $end | wc -c`

if [ $start_len -ne 4 -o $end_len -ne 4 ] ; then
	echo $0: Source OID range must have 4 digits
	exit 1
fi

let new_end=$new_start+$end-$start
if [ $start -le $new_start -a $end -ge $new_start -o $new_start -le $start -a $new_end -ge $start ] ; then
	echo $0: OID ranges may not overlap
	exit 1
fi


i=$start
j=$new_start
while [ $i -le $end ] ; do
	#echo $i $j
	sed -i "s/$i/$j/g" $filename
	let i=i+1
	let j=j+1
done