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elif [ "$DIR" != -d ] This checks if the string "$DIR" is the same as the string "-d", which of course it isn't.

You had it right in the last statement, with [ ! -d "$DIR"...

you almost got it:

....
elif [ ! -e "$DIR" ]
then
echo "Directory does not exist!"
exit 4
elif [ ! -d "$DIR" ]
then
echo "Not a Directory"
...