Provided by: util-linux_2.31.1-0.4ubuntu3_amd64
mountpoint - see if a directory or file is a mountpoint
mountpoint [-d|-q] directory | file mountpoint -x device
mountpoint checks whether the given directory or file is mentioned in the /proc/self/mountinfo file.
-d, --fs-devno Show the major/minor numbers of the device that is mounted on the given directory. -q, --quiet Be quiet - don't print anything. -x, --devno Show the major/minor numbers of the given blockdevice on standard output. -V, --version Display version information and exit. -h, --help Display help text and exit.
Zero if the directory or file is a mountpoint, non-zero if not.
Karel Zak <firstname.lastname@example.org>
LIBMOUNT_DEBUG=all enables libmount debug output.
The util-linux mountpoint implementation was written from scratch for libmount. The original version for sysvinit suite was written by Miquel van Smoorenburg.
The mountpoint command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.