Loop thru files in source directory; see if file exists in destination; if it does then see if the contents differ...
Code:
#!/usr/bin/ksh
SOURCE=/path/to/source/dir
DEST=/path/to/dest/dir
cd $SOURCE
for i in *
do
if [ -f $DEST/$i ]
then
echo file $i exists
if cmp -s $i $DEST/$i
then
echo files are the same
else
echo files are different
fi
else
echo file $i does not exist
fi
done