#!/bin/sh

FILE=$1
[ "${FILE#/}" = "${FILE}" ] && FILE=$PWD/$FILE

FILE=`realpath $FILE`

BACKUPDIR=/root/backup

TMP=`mktemp /tmp/backup.diff.xxxxx`
diff $FILE $BACKUPDIR/backup.0/$FILE > $TMP

if [ $? -eq 0 ]; then
	echo "$FILE: File is the same as in last backup"
else
	echo "$FILE: File is changed from backup"
	cat $TMP
fi

rm $TMP