How to test if a given path is a mount point

Question

Suppose do you want test if /mnt/disk is a mount point in a shell script. How do you do this?

Answer 1

for mountedPath in `mount | cut -d ' ' -f 3`; do
    if [ "${mountedPath}" == "${wantedPath}" ]; then
        exit 0
    fi
done
exit 1