Mountpoint checks if the directory is a mountpoint. $mountpoint / / is a mountpoint $echo $? 0 $mountpoint /dev/ /dev/ is a mountpoint $echo $? 0 $mountpoint /media/ /media/ is not a mountpoint $echo $? 1 $mountpoint /store/ /store/ is not a mountpoint $echo $? 1 $mountpoint /etc/ /etc/ is not a mountpoint $echo $? 1 $mountpoint /sys/ /sys/ is a mountpoint $echo $? 0 $mountpoint /sys/fs/cgroup/cpuset/ /sys/fs/cgroup/cpuset/ is a mountpoint $echo $? 0 $