# Generic solution which checks that the MIME type starts with text/:
while IFS= read -r -d '' -u 9
do
if [[ "$(file -bs --mime-type -- "$REPLY")" = text/* ]]
then
sed -i -e 's/[ \t]\+\(\r\?\)$/\1/' -- "$REPLY"
else
echo "Skipping $REPLY" >&2
fi
done 9< <(find . -type f -print0)