try either of these forms
Code:
if [ <condition> ]; then
# note space between ; and then
<code>
fi
Code:
if [ <condition> ]
then
<code>
fi
Edit, you might want to consider case
Code:
read vmsbckp
case $vmsbckp in
M|m) <code>
;;
D|d) <code>
;;
*) echo "wrong answer!"
;;
esac