for file in /folder1/* 
do
     file2="/folder2/`basename $file`"
     if [[ -r $file2 ]] ; then
         cksum $file | read one dummy1 dummy2
         cksum  $file2 read two dummy1 dummy2
         echo "$file   $file2 \c"
         if [[ "$one" = "$two" ]] ; then
                 echo "Y"
         else
                 echo "N"
         fi
     fi
done